Multiple Choice
Where do many of the seafood species that humans eat begin their life cycle?
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1. Introduction to Biology
Introduction to Biology
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When an individual is exercising, what occurs to the blood vessels in the dermis?
A
They remain unchanged in diameter.
B
They dilate to increase heat loss from the body.
C
They collapse to prevent sweating.
D
They constrict to reduce blood flow to the skin.
Verified step by step guidance1
Understand the role of blood vessels in thermoregulation: Blood vessels in the dermis help regulate body temperature by either dilating (widening) or constricting (narrowing) to control heat loss or retention.
Recall the physiological response to exercise: During exercise, the body generates heat as a byproduct of increased metabolic activity. To prevent overheating, the body must dissipate this excess heat.
Analyze the function of vasodilation: When blood vessels in the dermis dilate, more blood flows closer to the skin's surface, allowing heat to be released into the environment. This process is crucial for cooling the body during exercise.
Eliminate incorrect options: Blood vessels do not remain unchanged during exercise, as thermoregulation requires active adjustments. They also do not collapse, as this would prevent effective heat dissipation. Constriction would reduce blood flow to the skin, which is counterproductive for heat loss.
Conclude that the correct physiological response is dilation of blood vessels in the dermis to increase heat loss and maintain a stable body temperature during exercise.
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