How does the body send more blood to a certain area when needed, like to inner organs when it’s cold or to genitals when aroused?

Question

How does the body send more blood to a certain area when needed, like to inner organs when it’s cold or to genitals when aroused?

In: Biology

Answer 1

The body constricts the blood vessels (arteries) to the extremities. This concentrates the blood in the torso.
The same mechanism is utilized for shock when the body is injured.

You can see evidence of this when your hands or feet go pale in the cold.