Give a reason to explain why:
$(i)$ Adrenaline helps in dealing with emergency situations?
$(ii)$ Secretions of growth hormone should be specific in the human body?
$(iii)$ Some patients of diabetes are treated by giving injections of insulin?

(N/A) $(i)$ Adrenaline increases the heartbeat and breathing rate,which results in the supply of more oxygen to muscles. It reduces blood flow to the digestive system and skin; as a result,blood is diverted to skeletal muscles. All these responses together prepare the body to deal with emergency situations.
$(ii)$ If growth hormone is secreted in excess during childhood,it leads to $\text{gigantism}$,while less secretion of this hormone during childhood causes $\text{dwarfism}$.
$(iii)$ Patients suffering from diabetes have a high blood sugar level because insulin is not secreted in a sufficient amount by the pancreas to lower the blood sugar level. Therefore,to regulate the blood sugar level,insulin hormone is injected into such patients.