AP BIOLOGY

Detailed explanation-1: -Arteries have thick elastic walls and veins have valves. B. Capillaries are the smallest blood vessels supplying the tissues. C.

Detailed explanation-2: -These are blood vessels that carry oxygenated blood from the heart to the tissues. These have thick-walled and narrower lumens because they carry blood from the heart with great pressure.

Detailed explanation-3: -Arteries are the largest blood vessels with the thickest walls, and capillaries are the smallest. Arteries are only located deep inside your muscles, but capillaries are inside tissues all over your body.

Detailed explanation-4: -Veins have thick, elastic and muscular walls.

Detailed explanation-5: -Elastic arteries are those nearest the heart (aorta and pulmonary arteries) that contain much more elastic tissue in the tunica media than muscular arteries. This feature of the elastic arteries allows them to maintain a relatively constant pressure gradient despite the constant pumping action of the heart.