In a Capillary Bed, Relaxation of the Precapillary Sphincter

Question

In a capillary bed, relaxation of the precapillary sphincter
A) causes more blood flow through thoroughfare channels.
B) causes less blood to flow through capillaries.
C) occurs when the tissue in the area does not need more oxygen.
D) is voluntary.
E) occurs when the tissue in the area needs more oxygen.

Accepted Answer

Relaxation of the precapillary sphincter allows more blood to flow into the capillaries, which typically occurs in response to the tissue's increased need for oxygen. This process is part of the body's mechanism to ensure that tissues receive adequate oxygen and nutrients when their metabolic activity increases.