Blood Flow Through a Capillary is Controlled by The

Question

Blood flow through a capillary is controlled by the
A) vasa vasorum.
B) plexus.
C) precapillary sphincter.
D) thoroughfare channel.
E) venule.

Accepted Answer

Blood flow through a capillary is controlled by the precapillary sphincter. These are small rings of smooth muscle that regulate blood flow into the capillary, which can be contracted or relaxed to either allow or restrict blood flow. The vasa vasorum refers to a network of small blood vessels that supply oxygen and nutrients to the walls of larger blood vessels, while a plexus refers to a network of nerves, blood vessels, or lymphatic vessels. The thoroughfare channel is a direct channel connecting an arteriole and a venule, bypassing the capillary bed. The venule is a small vein that collects blood from capillaries.