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.
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.
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