Explain how the human body responds when adrenaline is secreted into the blood.

(N/A) When the organism confronts any stressful or scary situation,adrenaline is secreted from the adrenal gland and released directly into the blood. It is then circulated to various parts of the body,resulting in the following responses:
$(a)$ The heart beats faster to supply more oxygen to the muscles.
$(b)$ Blood supply to the digestive system and skin is reduced due to the contraction of muscles around small arteries. This diverts more blood to the skeletal muscles.
$(c)$ The breathing rate increases due to the contractions of the diaphragm and rib muscles,which allows for more oxygen intake.