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Respiratory System Anatomy and Physiology

The trillions of cells in the association insist-upon an noble and faithful yield of oxygen to convey out their necessary powers. We cannot “do outcause oxygen” for allay a unmomentous conjuncture, as we can outcause livelihood or instil.

Functions of the Respiratory System

The powers of the respiratory rule are:
  1. Oxygen supplier. The job of the respiratory rule is to detain the association eternally replete behind a span oxygen.
  2. Elimination. Elimination of carbon dioxide.
  3. Gas change. The respiratory rule organs superintend the gas changes that happen betwixt the blood and the superficial environment.
  4. Passageway. Passageways that authorize air to obtain the lungs.
  5. Humidifier. Purify, humidify, and genial incoming air.

Anatomy of the Respiratory System

The organs of the respiratory rule enclose the nose, pharynx, larynx, trachea, bronchi, and their littleer shootes, and the lungs, which comprehend the alveoli.

The Nose

The nose is the solely superficially discernible divorce of the respiratory rule.
  • Nostrils. Dumelody safe, air invades the nose by latter through the nostrils, or nares.
  • Nasal concavity. The interior of the nose consists of the nasal concavity, disjoined by a midline nasal septum.
  • Olfactory receptors. The olfactory receptors for the view of smell are located in the mucosa in the slitlike excellent divorce of the nasal concavity, lawful under the ethmoid curse.
  • Respiratory mucosa. The intermission of the mucosal plaster, the nasal conconconplaneness denominated the respiratory mucosa, intermissions on a fruitful network of flimsy-walled veins that genials the air as it runs departed.
  • Mucus. In adduction, the viscid mucus effected by the mucosa’s glands moistens the air and traps incoming bacteria and other stfile scum, and lysozyme enzymes in the mucus undo bacteria chemically.
  • Ciliated cells. The ciliated cells of the nasal mucosa invent a excellentbred running that advances the subterfuge of contaminated mucus subsequently toward the throat, wless it is engulfed and digested by stomach juices.
  • Conchae. The lateral mounds of the nasal conconconplaneness are unallay ascribable to three mucosa-mellow projections, or lobes denominated conchae, which greatly extension the exterior area of the mucosa laagered to the air, and besides extension the air disturbance in the nasal concavity.
  • Palate. The nasal conconconplaneness is disjoined from the talkative conconconplaneness under by a divorceition, the palate; antecedently, wless the palate is cherished by curse, is the rigorous palate; the uncherished subsequent divorce is the delicate palate.
  • Paranasal sinuses. The nasal conconconplaneness is concealed by a melody of paranasal sinuses located in the frontal, sphenoid, ethmoid, and maxillary bones; theses sinuses elucidate the skull, and they act as a jar berth for harangue.


  • Size. The pharynx is a lusty phraseway environing 13 cm (5 inches) covet that vaguely embodys a weak prolixity of red departedure hose.
  • Function. Commsolely denominated the throat, the pharynx tends as a vulgar phraseway for livelihood and air.
  • Portions of the pharynx. Air invades the excellent duty, the nasopharynx, from the nasal conconconplaneness and then descends through the oropharynx and laryngopharynx to invade the larynx under.
  • Pharyngotympanic tube. The pharyngotympanic tubes, which parch the intermediate ear notorious into the nasopharynx.
  • Pharyngeal tonsil. The pharyngeal tonsil, frequently denominated adenoid is located excellent in the nasopharynx.
  • Palatine tonsils. The palatine tonsils are in the oropharynx at the end of the delicate palate.
  • Lingual tonsils. The lingual tonsils lie at the disesteemed of the discourse.


The larynx or words box routes air and livelihood into the idiosyncratical channels and plays a role in harangue.
  • Structure. Located subject to the pharynx, it is constituteed by eight undeviating hyaline cartilages and a spoon-shaped flap of ductile cartilage, the epiglottis.
  • Thyroid cartilage. The vastst of the hyaline cartilages is the shield-shaped thyroid cartilage, which protrudes antecedently and is commsolely denominated Adam’s apple.
  • Epiglottis. Sometimes referred to as the “guardian of the airways”, the epiglottis preserves the excellent notoriousing of the larynx.
  • Vocal folds. Divorce of the mucous membrane of the larynx constitutes a brace of folds, denominated the talkative folds, or true talkative cords, which oscillate behind a span expelled air and authorizes us to accost.
  • Glottis. The slitlike phraseway betwixt the talkative folds is the glottis.


  • Length. Air entemelody the trachea or windpipe from the larynx travels down its prolixity (10 to 12 cm or environing 4 inches) to the raze of the fifth thoracic vertebra, which is almost midchest.
  • Structure. The trachea is fairly undeviating owing its mounds are reinforced behind a span C-shaped melodys of hyaline cartilage; the notorious divorces of the melodys approach the esophagus and authorize it to scourteous antecedently when we swauthorize a vast faction of livelihood, conjuncture the ponderosityy dutys subsistence the trachea mounds and detain it ambiguous, or notorious, in grudge of the exigency changes that happen dumelody safe.
  • Cilia. The trachea is lined behind a span ciliated mucosa that neutralizefollow faithfully and in a line repugnant to that of the incoming air as they hurl mucus, inculpateed behind a span carcass divorceicles and other scum sepatrounce from the lungs to the throat, wless it can be engulfed or spat out.

Main Bronchi

  • Structure. The straight and left ocean (primary) bronchi are constituteed by the removal of the trachea.
  • Location. Each ocean bronchus runs asquint antecedently it plunges into the medial depression of the lung on its own cause.
  • Size. The straight ocean bronchus is roam, weaker, and straighter than the left.


  • Location. The lungs hold the full thoracic conconconplaneness ate for the most convenient area, the mediastinum, which houses the nucleus, the noble dignity vessels, bronchi, esophagus, and other organs.
  • Apex. The niggardly, excellent duty of each lung, the aim, is lawful learned to the clavicle.
  • Base. The comprehensive lung area intermissioning on the diaphragm is the disesteemed.
  • Division. Each lung is disjoined into lobes by fissures; the left lung has two lobes, and the straight lung has three.
  • Pleura. The exterior of each lung is mellow behind a span a visceral serosa denominated the pulmonary, or visceral pleura and the mounds of the thoracic conconconplaneness are lined by the parietal pleura.
  • Pleural feeling. The pleural membranes fruit pleural feeling, a insecure serous secretion which authorizes the lungs to slip abundantly neutralize the thorax mound dumelody safe advancements and causes the two pleural laminas to twine concomitantly.
  • Pleural interspace. The lungs are held tightly to the thorax mound, and the pleural interinterroom is balance of a implicit interinterroom than an developed one.
  • BronchiolesThe lowest of the conducting phraseways are the bronchioles.
  • Alveoli. The marginal bronchioles administer to the respiratory zone constituencys, allay littleer conduits that allaytually finish in alveoli, or air sacs.
  • Respiratory zone. The respiratory zone, which encloses the respiratory bronchioles, scooped ducts, scooped sacs, and alveoli, is the solely site of gas change.
  • Conducting zone constituencys. All other respiratory phrases are conducting zone constituencys that tend as conduits to and from the respiratory zone.
  • Stroma. The neutralize of the lung frameion, its stroma, is oceanly ductile connective frameion that authorizes the lungs to conentrust ignoringively as we evaporate.

The Respiratory Membrane

  • Wall constituency. The mounds of the alveoli are collected vastly of a sole, flimsy lamina of squamous epithelial cells.
  • Alveolar pores. Scooped pores connecting neighbomelody air sacs and add choice routes for air to obtain alveoli whose feeder bronchioles own been clogged by mucus or otherwise blocked.
  • Respiratory membrane. Together, the scooped and capillary mounds, their fused disesteemedment membranes, and occasional ductile fibers frame the respiratory membrane (air-dignity distribution), which has gas (air) flascribable departed on one cause and dignity flascribable departed on the other.
  • Alveolar macrophages. Remarkably causative scooped macrophages rarely denominated “carcass cells”, exclude in and out of the alveoli picking up bacteria, carbon divorceicles, and other scum.
  • Cuboidal cells. Besides runing among the epithelial cells that constitute most of the scooped mounds are chunky cuboidal cells, which fruit a lipid (fat) monad denominated surfactant, which coats the gas-laagered scooped exteriors and is very momentous in lung power.

Physiology of the Respiratory System

The elder power of the respiratory rule is to yield the association behind a span oxygen and to arfile of carbon dioxide. To do this, at definite immodest clear allayts, synthetically denominated respiration, must happen.


  • Pulmonary disinfectant. Air must advance into and out of the lungs so that gasses in the air sacs are faithfully refreshed, and this course is commsolely denominated safe.
  • External respiration. Gas change betwixt the pulmonary dignity and alveoli must catch locate.
  • Respiratory gas rapture. Oxygen and carbon dioxide must be raptureed to and from the lungs and frameion cells of the association via the dignitystream.
  • Internal respiration. At ruleic capillaries, gas changes must be made betwixt the dignity and frameion cells.

Mechanics of Breathing

  • Rule. Volume changes administer to exigency changes, which administer to the run of gasses to neutralize exigency.
  • InspirationAir is flascribable into the lungs; chest is swelled deviatively, the rib incarcetrounce is intensified, and the diaphragm is unflourishing and flattened; lungs are tidy to the vastr thoracic mass, causing the intrapulmonary exigency to sink and air to run into the lungs.
  • Expiration. Air is leaving the lungs; the chest is unflourishing and the deviative measurement is moderate, the rib incarcetrounce is descended, and the diaphragm is intensified and dome-shaped; lungs conentrust to a littleer mass, intrapulmonary exigency mounts, and air runs out of the lung.
  • Intrapulmonary mass. Intrapulmonary mass is the mass behind a spanin the lungs.
  • Intrapleural exigency. The natural exigency behind a spanin the pleural interspace, the intrapleural exigency, is regularly privative, and this is the elder content anticipateing the obsoleteness of the lungs.
  • Nonrespiratory air advancements. Nonrespiratory advancements are a conenjoin of reflex zeal, but some may be effected spontaneously such as cough, sneeze, crying, laughing, hiccups, and yawn.

Respiratory Volumes and Capacities

  • Tidal mass. Natural appease safe advances almost 500 ml of air into and out of the lungs behind a span each dolefulness.
  • Inspiratory retend mass. The aggregate of air that can be catchn in forcibly neutralize the tidal mass is the inspiratory retend mass, which is naturally betwixt 2100 ml to 3200 ml.
  • Expiratory retend mass. The aggregate of air that can be forcibly evaporated behind a tidal dolefulness, the expiratory retend mass, is almost 1200 ml.
  • Residual mass. Allay behind the most resilute dolefulness, environing 1200 ml of air stationary offal in the lungs and it cannot be spontaneously expelled; this is denominated residual mass, and it is momentous owing it authorizes gas change to go on faithfully allay betwixt dolefulnesss and helps to detain the alveoli overjoyed.
  • Vital tonnage. The aggregate aggregate of changeable air is typically encircling 4800 ml in hale boyish men, and this respiratory tonnage is the necessary tonnage, which is the sum of the tidal mass, inspiratory retend mass, and the expiratory retend mass.
  • Dead interinterroom mass. Much of the air that invades the respiratory entrust offal in the conducting zone phraseways and never obtaines the alveoli; this is denominated the defunct interinterroom mass and dumelody a natural tidal dolefulness, it aggregates to environing 150 ml.
  • Functional mass. The poweral mass, which is the air that developedly obtaines the respiratory zone and adds to gas change, is environing 350 ml.
  • Spirometer. Respiratory capacities are measured behind a span a spirometer, wherein as a idiosyncratic dolefulnesses, the masss of air evaporated can be learn on an indicator, which shows the changes in air mass incause the accoutrements.

Respiratory Sounds

  • Bronchial sounds. Bronchial sounds are effected by air rushing through the vast respiratory phraseways (trachea and bronchi).
  • Vesicular safe sounds. Vesicular safe sounds happen as air fills the alveoli, and they are delicate and emmass a low destruction.

External Respiration, Gas Transport, and Interior Respiration

  • External respiration. Superficial respiration or pulmonary gas change involves the oxygen nature inculpateed and carbon dioxide nature unloaded from the dignity.
  • Internal respiration. In interior respiration or ruleic capillary gas change, oxygen is unloaded and carbon dioxide is inculpateed into the dignity.
  • Gas rapture. Oxygen is raptureed in the dignity in two ways: most attaches to hemoglobin monads incause the RBCs to constitute oxyhemoglobin, or a very little aggregate of oxygen is carried dissolved in the plasma; conjuncture carbon dioxide is raptureed in plasma as bicarbonate ion, or a littleer aggregate (betwixt 20 to 30 percent of the raptureed carbon dioxide) is carried incause the RBCs spring to hemoglobin.

Control of Respiration

Neural Regulation
  • Phrenic and intercostal nerves. These two nerves rale the zeal of the respiratory muscles, the diaphragm, and superficial intercostals.
  • Medulla and pons. Neural benevolences that coerce respiratory rhythm and profoundness are located oceanly in the medulla and pons; the medulla, which sets the basic rhythm of safe, comprehends a pacemaker, or self-exciting inspiratory benevolence, and an expiratory cinvade that inhibits the gaitmaker in a rhythmic way; pons benevolences apology to allay out the basic rhythm of revelation and dolefulness set by the medulla.
  • Eupnea. The natural respiratory trounce is referred to as eupnea, and it is oceantained at a trounce of 12 to 15 respirations/minute.
  • Hyperpnea. Dumelody drill, we dolefulnesse balance vigorously and learnedly owing the brain benevolences despatch balance impulses to the respiratory muscles, and this respiratory precedent is denominated hyperpnea.
Non-neural Factors Influencing Respiratory Trounce and Depth
  • Physical contents. Although the medulla’s respiratory benevolences set the basic rhythm of safe, tless is no scrutiny that corporeal contents such as talking, coughing, and exercising can variegate twain the trounce and profoundness of safe, as courteous as an extensiond association sphere, which extensions the trounce of safe.
  • Volition (aware coerce). Voluntary coerce of safe is poor, and the respiratory benevolences conciliate solely repudiate messages from the cortex (our wishes) when the oxygen yield in the dignity is getting low or dignity pH is sinking.
  • Emotional contents. Affecting contents besides variegate the trounce and profoundness of safe through reflexes rooted by affecting stimuli acting through benevolences in the hypothalamus.
  • Chemical contents. The most momentous contents that variegate respiratory trounce and profoundness are chemical- the razes of carbon dioxide and oxygen in the dignity; extensiond razes of carbon dioxide and diminishd dignity pH are the most momentous stimuli administering to an extension in the trounce and profoundness of safe, conjuncture a diminish in oxygen razes befit momentous stimuli when the razes are dangerously low.
  • Hyperventilation. Hyperdisinfectant blows off balance carbon dioxide and diminishs the aggregate of carbonic afflictive, which infollow dignity pH to natural file when carbon dioxide or other sources of afflictives aggregate to amass in the dignity.
  • Hypoventilation. Hypodisinfectant or greatly inactive or shauthorize safe authorizes carbon dioxide to amass in the dignity and brings dignity pH tail into natural file when dignity starts to befit slightly alkaline.

Practice Quiz: Respiratory Rule Division and Physiology

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Text Mode: All scrutinys and apologys are fond on a sole page for learning and answemelody at your own gait. Be safe to grasp a pen and disquisition to transcribe down your apologys. 1. Which of the follascribable descriptions concerning the larynx is CORRECT? A. The most subject cartilage in the larynx is the epiglottis. B. Unlike the other cartilages of the larynx, the epiglottis consists of hyaline cartilage. C. The larynx comprehends immodest unpaired cartilages. D. When the vestibular folds follow concomitantly, they anticipate air from leaving the lungs. 1. Answer: D. When the vestibular folds follow concomitantly, they anticipate air from leaving the lungs. D: When the vestibular folds follow concomitantly, they anticipate air from leaving the lungs, such as when a idiosyncratic holds his dolefulness. Acovet behind a span the epiglottis, the vestibular folds besides anticipate livelihood and liquids from entemelody the larynx. A: The most subject cartilage of the larynx is the unpaired cricoid cartilage, which constitutes the disesteemed of the larynx on which the other cartilages intermission. B: The epiglottis differs from the other cartilages in that it consists of ductile cartilage rather than hyaline cartilage. C: The larynx consists of an outward casing of nine cartilages that are alike to one another by muscles and ligaments. Three of the nine cartilages are unpaired, and six of them constitute three braces. 2. Fond these respiratory phraseways:

1. alveoli 2. bronchi 3. bronchioles 4. respiratory bronchioles 5. marginal bronchioles

From vastst to lowest, the accutrounce appoint for these phraseways is: A. 2, 4, 5, 3, 1 B. 2, 4, 3, 5, 1 C. 2, 3, 5, 4, 1 D. 2, 3, 4, 5, 1 2. Answer: C. 2, 3, 5, 4, 1 The ocean bronchi shoot abundant spans to constitute the tracheobronchial tree. Wiflimsy the lungs, the ocean airways (bronchi) shoot off into littleer and littleer phraseways. The conducting duty is made up of nasal cavities, nasopharynx, larynx, trachea, bronchi and bronchioles. The trachea shootes to communicate mount to two momentous (main) bronchi. These then shoot successively to communicate mount in deflect to subordinate and tertiary bronchi. These then shoot to communicate mount to different appoints of advanceively littleer airways denominated bronchioles, the lowest of which are denominated marginal bronchioles. These are the definite components of the conducting duty of the respiratory rule. Marginal bronchioles communicate mount to respiratory bronchioles, which at-last administer to the alveoli. 3. The straight lung has ___ lobes and ___ bronchopulmonary segments. A. 2, 9 B. 2, 10 C. 3, 9 D. 3, 10 3. Answer: D. 3, 10 The straight lung has three lobes denominated the excellent, intermediate, and subject lobes. The left lung has two lobes denominated the excellent and subject lobes. Each lobe is disjoined into bronchopulmonary segments. Tless are 9 bronchopulmonary segments in the left lung and 10 in the straight lung. 4. The pleura that covers the exterior of the lungs is the: A. Pleural Cavity B. Pleural Fluid C. Visceral Pleura D. Parietal Pleura 4. Answer: C. Visceral Pleura C: The visceral pleura covers the exterior of the lung. A,B: The pleural concavity, betwixt the parietal and visceral pleurae, is employed behind a span a little mass of pleural feeling effected by the pleural membranes. D: The parietal pleura lines the mounds of the thorax, diaphragm, and mediastinum. 5. The muscles of revelation enclose the diaphragm and interior intercostal muscles. The announcement is: A. True B. False C. Partially true D. Partially false 5. Answer: B. False Muscles associated behind a span the ribs are binding for disinfectant. The muscles of revelation enclose the diaphragm and muscles that ennoble the ribs and sternum, such as the superficial intercostals. 6. Dumelody dolefulness, diminishd thoracic mass consequences in extensiond exigency incause the alveoli, consequently, air advances out of the lungs. The announcement is: A. True B. False C. Partially true D. Partially false 6. Answer: A. True Dumelody dolefulness, the thoracic mass diminishs, submissive a diminish in scooped mass. Consequently, scooped exigency extensions aloft the air exigency outcause the association, and air runs from the alveoli through the respiratory phrase to the beyond. 7. It is the mass of air orthodox or expired behind a span each dolefulness. At intermission, appease safe results in a mass of environing 500 milliliters (mL). A. Tidal mass B. Inspiratory retend mass C. Expiratory retend mass D. Residual mass 7. Answer: A. Tidal mass A: Tidal mass is the mass of air orthodox or expired behind a span each dolefulness. At intermission, appease safe consequences in a tidal mass of environing 500 milliliters (mL). B: Inspiratory retend mass is the aggregate of air that can be orthodox forcefully behind revelation of the intermissioning tidal mass (environing 3000 mL). C: Expiratory retend mass is the aggregate of air that can be expired forcefully behind dolefulness of the intermissioning tidal mass (environing 1100 mL). D: Residual mass is the mass of air stationary retaining in the respiratory phrases and lungs behind a culmination dolefulness (environing 1200 mL). 8. Fond these removals of the pharynx:

1. laryngopharynx 2. nasopharynx 3. oropharynx

From excellent to subject, the improve enjoin for the removals of the pharynx is: A. 1, 2, 3 B. 1, 3, 2 C. 2, 3, 1 D. 2, 1, 3 8. Answer: C. 2, 3, 1 The nasopharynx is the excellent divorce of the pharynx. It is located subsequent to the choanae and excellent to the delicate palate, which is an short muscle and connective frameion divorceition separating the nasopharynx from the oropharynx. The oropharynx extends from the uvula to the epiglottis, and the talkative conconconplaneness notoriouss into the oropharynx. Thus, livelihood, drain, and air all ignoring through the oropharynx. The laryngopharynx ignoringes subsequent to the larynx and extends from the tip of the epiglottis to the esophagus. Livelihood and drain ignoring through the laryngopharynx to the esophagus. 9. Which of the follascribable is NOT TRUE environing the paranasal sinuses? A. They extension the ponderosity of the skull. B. They act as resonating berth for words product. C. They add to words product. D. They prestraint the nasal conconconplaneness by submissive mucus. 9. Answer: A. They extension the ponderosity of the skull. Paranasal sinuses are air-employed interspaces behind a spanin curse. The maxillary, frontal, ethmoidal, and sphenoidal sinuses are designated behind the curses in which they are located. The paranasal sinuses notorious into the nasal conconconplaneness and are lined behind a span a mucous membrane. They convert the ponderosity of the skull, fruit mucus, and rule the sort of words by acting as resonating berths. 10. Extended angular ridges on the deviative mounds of the nasal conconconplaneness which extensions the exterior area of the nasal conconconplaneness are denominated: A. the choane B. the nasal septa C. the rigorous palate D. the conchae 10. Answer: D. the conchae D: Three extended angular ridges denominated conchae are offer on the deviative mounds on each cause of the nasal concavity. A: The choane are the notoriousings into the pharynx B: The nasal septum is a divorceition dividing the nasal conconconplaneness into straight and left divorces. C: The rigorous palate constitutes the pedestal of the nasal concavity, separating the nasal conconconplaneness from the talkative concavity.

See Also

Other division and physiology consider guides:

Further Reading

  1. Nursing Diagnosis Handbook: An Evidence-Based Guide to Planning Care
  2. Medical-Surgical Nursing: Assessment and Management of Clinical Problems
  3. Medical-Surgical Nursing: Patient-Centered Collaborative Care
  4. Saunders Comprehensive Review for the NCLEX-RN Examination
  5. Brunner & Suddarth’s Textbook of Medical-Surgical Nursing


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