Which structure is the main site of exchange of oxygen, nutrients and waste products between blood and tissues?
Correct answer: C. Capillaries
- A. Elastic arteries
- B. Arterioles
- C. Capillaries
- D. Large veins
Explanation
Capillaries have very thin walls, usually one endothelial cell layer, allowing diffusion and filtration. Arteries and veins have thicker walls and mainly transport blood rather than exchange substances.
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About Cardiovascular System
The cardiovascular system covers the chambers, valves and major vessels of the heart, the cardiac cycle, conduction pathway, blood pressure and the circulation through pulmonary and systemic circuits. It also explains artery, vein and capillary structure, exchange at capillary beds, and how the cardiac cycle differs from general blood flow.
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