Question

what function do capillaries serve in the cardiovascular system?
a. carry blood to the brain
b. return blood to the lungs
c. help control body temperature
d. replace old blood cells
please select the best answer from the choices provided.
a
b
c
d

Explanation:

Capillaries are the smallest blood vessels. They have thin walls that allow for the exchange of substances like oxygen, carbon dioxide, and heat. When the body is hot, blood flow through capillaries near the skin's surface increases, allowing heat to be dissipated (helping control body temperature).

• Option A: Arteries (not capillaries) carry blood to the brain.
• Option B: Veins (not capillaries) return blood to the heart (and then to the lungs in the pulmonary circuit).
• Option D: Bone marrow (not capillaries) is involved in replacing old blood cells.

Answer:

C. help control body temperature