Arterioles

Arterioles are small branches of arteries, especially those that become capillaries.

Arterioles are responsible for distributing blood from the arteries to the capillary network. Their diameter is usually 10-100 micrometers. The walls of arterioles are composed of a single layer of smooth muscle cells that can contract to regulate blood flow.

Through contractions of smooth muscle cells, arterioles play an important role in regulating blood pressure and distributing blood between organs. Constriction of arterioles leads to increased peripheral resistance and blood pressure. The dilation of arterioles increases blood flow in the capillary networks.

Thus, arterioles function as blood flow regulators, ensuring blood delivery in accordance with the needs of the tissues. Disturbances in their work can lead to serious vascular diseases.