Aim: How does the Endocrine System work in our body?

The Endocrine System FUNCTIONS: Maintains stable body function (homeostasis) Responds to changes Collection of glands that produce hormones Control processes that happen slowly (nervous system controls those that happen quickly)

What are glands? Tissues found throughout your body Produce chemical messages HORMONES - speed up or slow down cellular activities Glands release their hormone directly into the blood  transports to target tissue FUNCTIONS: Regulate internal environment Adapt to stressful situations Growth & development

Types of Glands: Pituitary Thyroid Located in the brain Growth and reproduction ‘master’ gland Hypothalamus controls the pituitary gland Specialized cells located in brain that link the endocrine system with the nervous system Thyroid Located below the larynx Regulates metabolism and bone growth

Important Hormones Androgens Insulin/ Glucagon Testosterone – male reproductive hormone Estrogen – female reproductive hormone Insulin/ Glucagon Work together to maintain stable levels of blood sugar Insulin- released when levels of blood sugar are high Glucagon- causes the liver to release stored glucose from cells into the body when glucose is low

What does the endocrine system do???? Hormone secreted  travels to ‘target’ cell Each have a specific receptor

Negative Feedback System Controls the amount of hormones in your body- adjusts hormone levels automatically Example: STIMULUS- eating a sandwich 1. Intestine takes in glucose Glucose in bloodstream increases Glucose detected by insulin from pancreas Pancreas responds by producing more insulin Insulin released  liver takes up glucose Glucose level decreases (body consumes glucose) Homeostasis restored