When venous pressure is too low, ________ stimulate smooth muscles in the walls of veins to contract.
A)parasympathetic reflexes
B)sympathetic reflexes
C)somatic reflexes
D)carbon dioxide levels

Question

Quizplus · Accepted Answer

Sympathetic reflexes stimulate smooth muscles in the walls of veins to contract when venous pressure is too low. This helps to increase venous return and maintain adequate blood pressure. Parasympathetic reflexes and somatic reflexes are not involved in regulating venous pressure. Carbon dioxide levels may affect breathing rate and cardiac output, but do not directly stimulate the smooth muscles in veins.

When Venous Pressure Is Too Low, ________ Stimulate Smooth Muscles