Can you describe arteries capillaries and veins?

Answer 1

Arteries have thick walls that carry blood from the heart to different parts of the body. Veins have thinner walls that carry non-oxygenated blood to the heart. Capillaries are extremely thin walls that join arteries to veins.

Answer 2

arteries

- have a thick outer layer of longitudinal collagen and elastic fibres to avoid bulges and leaks

- have a thick wall to withstand the high pressures

- have thick layers of circular elastic and muscles fibres to help pump the blood on after each heart beat

- have narrow lumen to help maintain the high pressures

capillaries

- have a wall that consists of a single layer of thin cells so the distance for diffusion in or out is small

- have pores between cells in the wall that allow some of the plasma to leak out and form tissue fluid. Phagocytes can also squeeze out

- have very narrow lumen - only about 10um across so that capillaries fit into small spaces. Many small capillaries have a larger surface area than fewer wider ones

Answer 3

I.D.K[I Don;t Know]