Redistribution

Question 1

Vascular shunting

Answer 1

When we exercise blood is redistributed. The working muscles need more oxygen then other inactive areas or the body eg the stomach. Blood is diverted away from inactive areas to working muscles.

Question 2

Vasoconstriction

Answer 2

The narrowing of the internal diameter (lumen) of a blood vessel. It restricts the blood flowing through it. Blood vessels constrict during exercise so that less blood is delivered to inactive areas.

Question 3

Vasodilation

Answer 3

The widening of the internal diameter (lumen) to increase the level of blood flowing through it. Blood vessels dilate during exercise so that more blood can be delivered to the working muscles - active areas, increasing their oxygen supply.

Question 4

Vasodilation in regulating body temperature

Answer 4

When the body temperature rises, the blood vessels dilate - increase in diameter to increase the blood flow to the capillaries under the surface of the skin so heat can radiate from the skin

Question 5

Vasoconstriction in regulating body temperature

Answer 5

When the boys temperature decreases, the blood vessels constrict - decrease in diameter to decrease the blood flow to the capillaries under the surface of the skin so less heat is lost