The endocrine system is made up of glands, without ducts, that release hormones that act to regulate the body"s growth, metabolism, sexual development and function. In this series of activities the role of melatonin, secreted by the pineal gland and it"s role in sleep regulation is looked at first. Then the actions of adrenaline to prepare the body for fight or flight. Finally, the control of the endocrine system is...