explain how the human body responds when adrenalin is secreated into blood.
When Adrenaline is secreted directly into the blood and carried to different parts of the body, it has different affects on the target organs including the heart
Under the action of adrenalin, the heart beats faster, resulting in supply of more oxygen to our muscles.
The blood to the digestive system and skin is reduced due to contraction of muscles around small arteries in these organs and diverts it to our skeletal muscles.
The breathing rate also increases because of the contractions of the diaphragm and the rib muscles.