Which blood vessels carry oxygen and nutrients directly to the individual cells in tissues and organs?

AVeins

BArteries

CCapillaries

DVenules

How do capillaries differ in structure from arteries and veins?

ACapillaries have smoother muscle tissue than veins.

BCapillaries appear to have a larger diameter than veins

CCapillaries have valves which are absent in arteries.

DCapillaries are only one cell thick and lack smooth muscle.