Peripheral resistance is maximum in_______________?
Correct answer: C. Arteriole
- A. Aorta
- B. Artery
- C. Arteriole
- D. Vein
Explanation
Arterioles provide the greatest resistance because their small radius is actively regulated by smooth muscle. Since resistance varies inversely with the fourth power of radius, small changes in arteriolar diameter have major effects on blood flow.
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