Recommendations What is the precapillary sphincter?

What is the precapillary sphincter?

What is the precapillary sphincter?

Medical Definition of precapillary sphincter : a sphincter of smooth muscle tissue located at the arterial end of a capillary and serving to control the flow of blood to the tissues.

What is the function of precapillary sphincters quizlet?

-Precapillary sphincters: are rings of smooth muscle that regulate the flow of blood through capillaries; they help control the blood flow to where it is needed.

What is a precapillary sphincter quizlet?

Precapillary Sphincter. A band of smooth muscle that adjusts blood flow into capillaries mainly in the mesenteric microcirculation. At the point where each of the capillaries originates from an arteriole, a smooth muscle fiber encircles the capillary. Blood flow between capillaries, the intestitial fluid and cells.

How do precapillary sphincters in capillary beds function quizlet?

Precapillary sphincters close and blood bypasses the capillaries and flows through the thoroughfare channel directly to the venule. Found in fingers, toes, and ears, play a role in temperature regulation.

What statement about precapillary sphincters is correct?

Which statement about precapillary sphincters is CORRECT? They contract when oxygen levels in the tissue are low. They can close off the capillaries by contracting. They are openings that allow large molecules and blood cells to leave the capillary.

What creates the pulse quizlet?

What can cause the pulse to occur? Pulsating wave of blood through arteries.

What happens when precapillary sphincters contract?

The precapillary sphincter has now also been found in the brain, where it regulates blood flow to the capillary bed. The sphincter can open and close the entrance to the capillary, by which contraction causes blood flow in a capillary to change as vasomotion occurs.

Why are precapillary sphincters so important?

Precapillary sphincters represent important anatomical sites of blood flow regulation due to their strategic placement at branch points of proximal PAs, where they reduce both pressure and RBC flux into the downstream capillary bed and thereby regulate perfusion along the PA (Fig. 7).