Which of the following statements is true?

Veins carry blood away from the heart.

Arteries are thinner and harder than veins.

Capillaries connect arteries and veins.

The left ventricle controls the heartbeat.

C

Capillaries connect the arteries to veins. The arteries deliver the oxygen-rich blood to the capillaries, where the actual exchange of oxygen and carbon dioxide occurs.

C. capillaries connect arteries and veins.

Explanation:

A is false, veins carry blood towards the heart.

B is false because arteries are the thickest blood vessel.

C is completely true

D is false, heartbeat is controlled by electric impulses