Question

1. arteries are structurally different from veins in which way? a. they have thicker and stretchier walls to accommodate higher pressures b. they lack valves c. they have a tunica media d. a and b

Explanation:

Arteries carry oxygen - rich blood away from the heart under high pressure, so they have thicker and stretchier walls. Veins have valves to prevent back - flow of blood which arteries lack. Both arteries and veins have a tunica media layer.

Answer:

D. a and b