When the level of blood flow is not ideally matched with the amount of airflow in a localized area of lung tissue
A) autoregulatory mechanisms are invoked.
B) the autonomic nervous system couples the events more ideally.
C) if airflow is low and blood flow to high, arteriolar vasoconstriction occurs.
D) both (a) and (b) above.
E) both (a) and (c) above.

Question

Quizplus · Accepted Answer

When the level of blood flow is not ideally matched with the amount of airflow in a localized area of lung tissue, both autoregulatory mechanisms (choice A) and arteriolar vasoconstriction (choice C) occur. The autonomic nervous system does not play a significant role in this process, so choice B is incorrect. Thus, both (a) and (c) are correct, giving us answer choice E.

When the Level of Blood Flow Is Not Ideally Matched