The Endocrine System

What is the endocrine system? The endocrine system is a complex collection of hormone-producing glands that control basic body functions such as metabolism, mood, growth and sexual development. Some hormones also allow you to respond to stress

How does the Endocrine System Regulate the Body? It is made of glands that secrete hormones directly into your bloodstream These hormones cause changes in your body

What is a hormone and what do they do? A hormone is a “chemical messenger” A chemical that delivers a message Hormones are made in the glands of your endocrine system and secreted into your blood They travel through your blood until they reach special target cells

Can you think of any hormones and their functions?

Examples of Hormones Hormone Gland Function Melatonin Pineal Causes sleepiness: “circadian rhythm” Adrenalin Adrenal Fight or flight response Growth hormone Pituitary Stimulates growth and cell reproduction Insulin Pancreas Regulates energy and glucose (sugar) in the blood Testosterone Testes Production and regulation of male reproductive system Estrogen Ovaries Production and regulation of female reproduction system

How does the Endocrine System Compare to the Nervous System? Like the nervous system, the endocrine system is a controlling system of the body The brain controls the endocrine system, but they work together to regulate the body In the brain is the hypothalamus, also known as the "master switchboard."

How does the Endocrine System Compare to the Nervous System? Hormones are transported around (to their target organs) the body by the blood. Therefore hormonal responses are relatively slow compared with nervous responses. Many hormonal responses (ex: growth) occur over relatively long periods of time. The main purpose of the Endocrine System is to maintain Homeostasis within the body (that is, to keep the internal environment constant/within balance) The key function of the Nervous System is to receive and respond to stimuli.

Why do people pee their pants when they are scared? There’s actually a scientific explanation! The Fight or Flight Response.

Fight or Flight Response Controlled by an area of the brain called the hypothalamus: the part of the brain that links the nervous and endocrine systems.

Fight or Flight Response When we think we are in danger, the hypothalamus begins a series of nerve cell firings and releases hormones like adrenaline, into our bloodstream. These patterns of nerve cell firing and chemical release cause our body to undergo a series of very dramatic changes.

These changes are designed to either help you fight or run away (flight) to safety in times of danger

Stimulus : Response Response = Response = Hypothalamus releases hormones into body Response = Heart rate and breathing rate increase, sweating increases, blood thickens, blood flow to muscles increase all so we can RUN! Bear = external stimulus Hormones become = Internal stimulus

Think, Pair, Share What is the Fight or Flight Response? What causes it? Can you name some changes that occur in your body during the fight or flight response?

Your cartoon must show: Create a cartoon demonstrating an organism experiencing the fight or flight response Your cartoon must show: The external stimulus (what caused the stress) How the organism responds What happens inside their body? What do they do?

What is the function of the Endocrine System? Review What is the function of the Endocrine System?

Review The endocrine system is a complex collection of hormone-producing glands that control basic body functions such as metabolism, mood, growth and sexual development.

What is fight or flight response? Review What is fight or flight response?

Fight or Flight Response When we think we are in danger, the hypothalamus begins a series of nerve cell firings and releases hormones like adrenaline, into our bloodstream. These patterns of nerve cell firing and chemical release cause our body to undergo a series of very dramatic changes.

Review What are some examples of hormones, where are they found and what do they do?

Examples of Hormones Hormone Gland Function Melatonin Pineal Causes sleepiness: “circadian rhythm” Adrenalin Adrenal Fight or flight response Growth hormone Pituitary Stimulates growth and cell reproduction Insulin Pancreas Regulates energy and glucose (sugar) in the blood Testosterone Testes Production and regulation of male reproductive system Estrogen Ovaries Production and regulation of female reproduction system