Question 1:

Which blood vessels carry blood away from the heart?

Explanation: Arteries carry blood away from the heart to various parts of the body.

Question 2:

Which blood vessels have thin walls and allow for the exchange of gases and nutrients with tissues?

Explanation: Capillaries have thin walls and allow for the exchange of gases and nutrients with tissues.

Question 3:

Which blood vessels contain valves to prevent the backward flow of blood?

Explanation: Veins contain valves to prevent the backward flow of blood.

Question 4:

Which blood vessels have the thickest and most muscular walls?

Explanation: Arteries have the thickest and most muscular walls to withstand the high pressure of blood pumped by the heart.

Question 5:

Which blood vessels carry blood back to the heart?

Explanation: Veins carry blood back to the heart.