A.Adrenaline is a hormone secreted when a person is frightened or mentally disturbed. 

B.When Adrenaline reaches the heart, heartbeat will increase to increase blood supply to our muscles.

C. Adrenaline also increases the breathing rate because of contraction of diaphragm and the rib muscles.

D. Adrenaline rush also increases blood pressure and allows entry of more glucose into blood. 

E.These altogether occurs when our body responds to secretion of adrenaline into our blood.