Blood vessel walls contain elastin, a protein that allows the vessel to stretch under high pressure. Which type of blood vessel do you expect will have the highest concentration of elastin in its walls?

Brainlest awardhow does smoking and arterial plaques increase the risk of hypertension? (2 points) select one: a. both increase blood volume. b. both decrease blood volume.c. both expand the diameter of the blood vessels. d. both constrict the diameter of the blood vessels.