Question

multiple choice question
the skin reddens after one comes in from the cold; this is an example of what?

• hypoxia
• angiogenesis
• reactive hyperemia

Explanation:

• Hypoxia is a deficiency in oxygen supply, not related to skin reddening from cold exposure.
• Angiogenesis is the formation of new blood vessels, not the immediate reddening after cold.
• Reactive hyperemia occurs when blood flow increases to a tissue after a period of restriction (like cold causing vasoconstriction, then vasodilation when warm), leading to skin reddening.

Answer:

C. Reactive hyperemia (Note: Assuming the options are labeled A, B, C with A: Hypoxia, B: Angiogenesis, C: Reactive hyperemia as per the order in the question. If the original options had different labels, adjust accordingly, but based on the content, the correct one is Reactive hyperemia.)