Pulmonary vascular resistance is
A. Less than one-third that offered by the systemic circuit.
B. Decreased when alveolar oxygen pressure falls.
C. Expressed in units of volume flow per unit time per unit pressure gradient.
D. Decreased during exercise.
E. Regulated reflexly by sympathetic vasoconstrictor nerves
instantknowledge Answered question August 15, 2024
B. Decreased when alveolar oxygen pressure falls.
This is incorrect. Pulmonary vascular resistance actually increases when alveolar oxygen pressure falls, a phenomenon known as hypoxic pulmonary vasoconstriction
instantknowledge Answered question August 15, 2024