High School

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In which of the following would you see an increase in peripheral resistance?

1. In a person with anemia where the viscosity of the blood is low
2. In large blood vessels such as the aorta
3. In the right coronary artery showing atherosclerosis
4. In short vessels such as the suprarenal artery

Answer :

Final answer:

An increase in peripheral resistance is most likely to be seen in the right coronary artery showing atherosclerosis, as the condition narrows the artery and thus increases resistance.

Explanation:

You would see an increase in peripheral resistance in cases where the blood vessel diameter is reduced, the vessel length is increased, or the blood viscosity is higher. Regarding the options provided:

In a person with anemia where the viscosity of the blood is low, peripheral resistance would actually decrease because lower viscosity means less resistance for blood flow.

In the right coronary artery showing atherosclerosis, you would indeed see an increase in peripheral resistance. Atherosclerosis leads to the narrowing of the arteries due to plaque build-up, thus increasing resistance.

In short vessels such as the suprarenal artery, length is a less critical factor, and therefore, resistance wouldn't necessarily be higher due to the vessel being short.

Therefore, among the given options, an increase in peripheral resistance would most likely be observed in the right coronary artery with atherosclerosis.

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