Epinephrine and nor epinephrine, also called catecholamine's, are hormones of the sympathetic nervous system. Which of the following is NOT a physiological response influenced by catecholamine's?
A)Increased contractility, resulting in increased cardiac output
B)Decreased systolic blood pressure
C)Vasoconstriction in non-exercising muscles and vasodilation of cardiac and exercising skeletal muscle
D)Dilation of the respiratory passages to aid in ventilation.

Question

Quizplus · Accepted Answer

Catecholamine's do not cause a decrease in systolic blood pressure. After release by the adrenal medulla, epinephrine (primarily) and norepinephrine cause increased cardiac contractility, increased cardiac output, vasoconstriction in non-exercising muscles which increases systolic blood pressure, vasodilation in cardiac muscle, vasodilation in the exercising skeletal muscle, and dilation of the respiratory passages. These responses are often referred to as the "fight or flight" response.

Epinephrine and nor Epinephrine, Also Called Catecholamine's, Are Hormones of the Sympathetic