A normal expiration during quiet breathing: Select one: a. is an active process involving muscle contraction. b. occurs...

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Medical Sciences

A normal expiration during quiet breathing:
Select one:
a. is an active process involving muscle contraction.
b. occurs when the diaphragm and external intercostal musclesrelax.
c. is not affected by the elastic properties of the lungs.
d. requires more muscle contractions than inspiration.
e. occurs due to the contraction of the diaphragm and elevationof the ribs.
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After hyperventilating for several minutes:
Select one:
a. blood pH would drop and inhibit inspiration.
b. blood pH will rise and stimulate expiration.
c. O₂ in the lungs has not had time to diffuse intothe blood.
d. the level of O₂ has increased and inhibits theinspiratory center.
e. the level of CO₂ decreases below the levelnecessary to stimulate the inspiratory center.

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1 Answer B occurs when the diaphragm and the external intercostal muscles relaxes Reason In a resting state this phase of respiration is achieved by relaxation of these muscles and not by the See Answer

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