How does the hormone adrenalin affect us?

(i) Adrenaline is carried to target organs/heart. 

(ii) Heart beats faster, the supply of oxygen and glucose to muscles increases. 

(iii) In the liver, glycogen changes into glucose. Blood supply to the digestive system and skin reduced. 

(iv) Breathing rate increases, which also increases the oxygen supply.

(v) Blood supply diverted to skeletal muscles. 

(vi) Animal body becomes ready to deal with the situation.

(vii) The timing and amount of hormone released are also regulated by the feedback mechanism.