On a cold day, the arterioles supplying the capillaries of the skin
- A. constrict, reducing heat loss from the surface
- B. dilate widely to warm the skin
- C. burst under pressure
- D. stop carrying blood altogether
Explanation
Vasoconstriction keeps warm blood in the core, which is why skin looks pale in the cold. Dilation happens in heat to dump warmth, the opposite response to the opposite stimulus.
Related questions
Ultrafiltration in the glomerulus is driven by
Which of the following is normally absent from glomerular filtrate?
All the glucose in the filtrate is normally reabsorbed in the
A desert mammal can produce very concentrated urine because it has
Antidiuretic hormone controls the water content of the blood by