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on 24-Sep-2017 (Sun)

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#1 #jrs #mm #respiratory
The trachea serves as a conduit for ventilation and the clearance of tracheal and bronchial secretions.

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#1 #jrs #mm #respiratory
The trachea bifurcates at the carina into the right and left main stem bronchi.

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#1 #jrs #mm #respiratory
the diaphragm, and, to a lesser extent, the external intercostal muscles are responsible for inspiration;

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#1 #jrs #mm #respiratory
he distance from the tracheal carina to the take-off of the right upper lobe bronchus is an average of2 .0 cm in men and approximately 1.5 cm in women.

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#1 #jrs #mm #respiratory
he sternoclei- domastoid, scalene, and pectoral is muscles can be recruited during inspiration.

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#1 #jrs #mm #respiratory
Exhalation may be facilitated by the abdominal muscles (rectus abdominis, external and internal oblique, and transversus) and perhaps the internal intercostal muscles- aiding the downward move- ment of the ribs.

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#1 #jrs #mm #respiratory
The left main stem bronchus is longer

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#1 #jrs #mm #respiratory
Diaphragmatic movement normally accounts for 75% of the change in chest volume.

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#1 #jrs #mm #respiratory
Contraction of the diap hr agm- t he principal pulmonary muscl

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#1 #jrs #mm #respiratory
Expiration is normally passive in the supine position, but becomes active in the upright position and with increased effort.

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#1 #jrs #mm #respiratory
cricoid carti- lage is the narrowest part of the trachea,

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#1 #jrs #mm #respiratory
Humidificati on and fi lt ering of inspired air are functions of the upper airway (nose, mouth, and pharynx).

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#1 #jrs #mm #respiratory
function of the tracheobronchial tree is to conduct gas flow to and from the alveoli.

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#1 #jrs #mm #respiratory
tracheal bifurcati on located at the level of the sternal angle

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#1 #jrs #mm #respiratory
Gas exchange can occur only across the flat epithelium, which begins to appear on respiratory bronchioles

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#1 #jrs #mm #respiratory
Loss of cartilaginous support causes the patency of smaller airways to become dependent on radial traction by the elas- tic reco il of the surrounding tissue; as a corollary, airway diameter becomes dependent on total lung volume.

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#1 #jrs #mm #respiratory
pright posi- tion, the largest alveoli are at the pulmonary apex, whereas the smallest tend to be at the base. With inspiration, discrepancies in alveolar size diminish.

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#1 #jrs #mm #respiratory
Alveofar size is a function of both gravity and lung volume.

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#1 #jrs #mm #respiratory
he pulmonary interstitial space contains mainly elastin, collagen, and perhaps nerve fibers.

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#1 #jrs #mm #respiratory
Gas exchange occurs primarily on the thin side of the alveolocapillary membrane,

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#1 #jrs #mm #respiratory
Type I pneumocytes are flat and form tight

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#1 #jrs #mm #respiratory
upr

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