_______ Permit Materials to Be Exchanged Between the Blood and Tissues

Question

_______ permit materials to be exchanged between the blood and tissues.
A) Capillaries
B) Veins
C) Arterioles
D) Arteries

Accepted Answer

Capillaries are the smallest blood vessels that connect arteries and veins. They permit the exchange of materials such as oxygen, nutrients, carbon dioxide, and waste products between the blood and tissues. Arteries and veins do not permit the exchange of materials as their primary function is to transport blood away from or towards the heart, respectively. Arterioles are smaller branches of arteries that regulate blood flow into capillaries, but they do not permit the exchange of materials themselves.