6. What is Vasoconstriction?
- The narrowing of the internal diameter to restrict the volume of blood.
- The widening of the internal diameter to increase the volume of blood travelling through
7. Capillaries are...
- A network of microscopic blood vesells that are one cell thick
- Small air sacs in the lungs where gaseous exchange takes place
8. What happens when the air passes through the bronchi and bronchioles?
- Gaseous exchange
- Respiration
- Fatigue
