Zoology Notes

Adrenaline is known as the emergency hormone because it is released by the adrenal glands under the conditions of stress or excitement. This hormone is also a part of the body’s stress response called the fight or flight response. Adrenaline performs various functions in the body like:

Increases the supply of oxygen and glucose to muscles and brain.

Increases the heart rate and the amount of blood pumped by the heart per beat.

Dilates the air passages and constricts the blood vessels.