Author Question: Which of the following statements is false regarding the pulmonary circulation? a. Pulmonary ... (Read 73 times)

roselinechinyere27m · **on:** Jul 16, 2018

Which of the following statements is false regarding the pulmonary circulation?

a. Pulmonary blood flow is highly dependent on gravity.
b. The pulmonary circulation is a low-pressure system.
c. Toward the top of the upright lung, blood flow is high.
d. Toward the top of the upright lung, blood flow is low.

Question 2

Pressures in the pulmonary circulation are lower than those in the systemic circulation because of what characteristic of the pulmonary circulation?

a. Higher resistance than the systemic circu-lation
b. Less blood flow than the systemic circula-tion
c. Lower resistance than the systemic circu-lation
d. More blood flow than the systemic circu-lation

taylorsonier · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

ANS: C
As a consequence of having a low blood pressure and being susceptible to gravity, blood flow is much higher in the lung bases in resting upright subjects. Gravity-related effects also occur in re-cumbent positions but are less pronounced.

Answer to Question 2

ANS: C
While the entire cardiac output passes through both pulmonary and systemic circuits, the pulmo-nary circulation offers much lower resistance and, as a result, has a much lower blood pressure.