precapillary sphincter

In the pre-capillary sector, arterioles and precapillary sphincters participate.

The microscopic precapillary sphincters function to control the blood flow into each capillary in response to local metabolic activity.

This latter hypothesis is posited due to the presence of precapillary sphincters in capillary beds.

Sphincters are found in many animals; there are over 50 types in the human body, some microscopically small, in particular the millions of precapillary sphincters.

As anaerobic metabolism continues, increasing the body's metabolic acidosis, the arteriolar smooth muscle and precapillary sphincters relax such that blood remains in the capillaries.

Smooth muscle forms precapillary sphincters in blood vessels in metarterioles which regulates the blood flow in capillary beds of various organs and tissues.

The internal diameter of 8 μm forces the red blood cells to Precapillary sphincters - rings of smooth muscles at the origin of true capillaries that regulate blood flow into true capillaries - which thus control blood flow through a tissue.