Adrenaline is the hormone which is secreted during an emergency. The gland which secretes adrenaline is called adrenal gland.

When adrenaline is secreted into the blood it prepares our body for action. It speeds up heart beat and breathing, raises blood pressure and allows more glucose(Carbohydrate) to go into the blood to give us lot of energy quickly to run or fight. And hence it is an emergency hormone. When secreted in large amounts, it speeds up the heartbeat and hence supplies more oxygen to the muscles. It is secreted in the body when the body is under severe physical/emotional stress or depression.

Explanation: Hormones are chemical messengers whose secretion is maintained by endocrine glands. Adrenalin gland (is an endocrine gland) is situated above both kidneys. It helps in regulation (increasing) of blood pressure, heart beat, carbohydrate metabolism (during an emergency).