Which hormone is secreted under the fight or flight situation ? State its effects.

Explanation

Adrenaline hormone is secreted from adrenal gland in the body under the fight or flight situation.
The effect of adrenaline in body are as follows :
(1) The heartbeats become faster, resulting in supply of more oxygen to our muscles.
(2) The blood supply to the digestive system and skin is reduced due to contraction of muscles around small arteries in these organs. This diverts the blood to our skeletal muscles.
(3) The breathing rate increases because of the contractions of diaphragm and the rib muscles.
All these responses together enable the animal body to be ready to deal with the situation of fight or flight.