Question

question 10
which blood vessels are the site of gas exchange between our respiratory and circulatory systems?
a capillaries
b veins
c arteries

Explanation:

Capillaries are the smallest blood vessels with thin walls. This structure allows for easy diffusion of oxygen from the respiratory system (lungs) into the blood (circulatory system) and carbon dioxide from the blood into the lungs. Veins carry deoxygenated blood (except for the pulmonary vein) back to the heart, and arteries carry oxygenated blood (except for the pulmonary artery) away from the heart. Their main functions are not gas exchange but rather blood transport.

Answer:

A. capillaries