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Physiology

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Respiration

Question
31 out of 33
 

Anatomic dead space is what % of tidal volume:



A 20%
B 30%
C 40%
D 50%

Ans. B 30%

I. A normal individual at rest inspires about 12 to 16 times/minute and each breath have a tidal volume of about 500 mL.

II. A portion (more or less 30%) of the fresh air inspired with each breath does not reach the alveoli but remains in the. conducting airways of the lung. This component of each breath is called the ANATOMIC DEAD SPACE component.

a. Dead space is decreased by

i. supine postionQ

ii. neck fully flexedQwith depressed chin

iii. low lung volumesQ

iv. TracheostomyQ&endotracheal intubationQ(Artificial airway)

b. Dead space increased by

i. endotracheal intubation with tubeQ(increased mechanical DS due to tube volume)

ii. standing positionQ (due to hypoperfusion of apical alveoli)

iii. emphysema Q

iv. neck extension Q

Ipratropium (Bronchodilation)

Respiration Flashcard List

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