Question

Capillaries structures and function

Answer 1

Answer:

Capillaries, the smallest and most numerous of the blood vessels, form the connection between the vessels that carry blood away from the heart (arteries) and the vessels that return blood to the heart (veins). The primary function of capillaries is the exchange of materials between the blood and tissue cells.

Answer 2

Answer:

Capillaries are very thin, approximately 5 micrometers in diameter, and are composed of only two layers of cells—an inner layer of endothelial cells and an outer layer of epithelial cells. They are so small that red blood cells need to flow through them single file.

Capillaries are very tiny blood vessels — so small that a single red blood cell can barely fit through them.

They help to connect your arteries and veins in addition to facilitating the exchange of certain elements between your blood and tissues.