Do Now: Major Organs of the Endocrine System

AP Test (or absent) on Thursday or Friday

Period 1 Leo, Frankie, Robbie, Diana, Meza Period 3 Kimmy, Adrian, Ailyn, Erick, Ashley, Glenda, Julio, Marisol, Cristian, Period 5 Alexis B, Alondra, Hugo, Valery

Video Questions: The Endocrine System

Notes: Introduction to the Endocrine System

FILL IN ALL THE BLANKS and ANSWER The Checking for

Understanding Questions

The Endocrine system influences almost every cell and organ through messengers known as hormones.

What is the Endocrine system?

Hormones are substances secreted by cells that act to regulate the activity of other cells in the body.

• Hormones act as chemical messengers, carrying instructions that cause cells to change their activities.

• Hormones work with the nervous system to deliver messages to the body.

growth hormones

What is a hormone?

1. Why is the Endocrine System important?  2. What other body system do hormones

work with to deliver messages to the body?

Endocrine glands are organs that secrete hormones directly into either the bloodstream or the fluid around cells.

•  An example of an endocrine gland is the pancreas which secretes insulin and glucagon that regulate blood glucose levels.

What is an endocrine gland?

Hormones transfer information and instructions from one set of cells to another.

• Each hormone is specific to a cell or organ. • Hormone levels can be influenced by stress, infection, and changes in levels of substances in the blood.

How do hormones work?

High levels of a hormone inhibit (stop) the production of more hormone. Feedback loops in the nervous and endocrine system keep the conditions of the body in balance.

What is negative feedback?

3. The pancreas in an endocrine gland. What hormones does it secrete and what does it do?

4. How do feedback loops (negative feedback) keep you alive?

Insulin is a hormone that LOWERS blood glucose levels. Glucagon is a hormone that RAISES blood glucose levels - Both hormones (insulin and glucagon) respond to blood sugar levels.

What is Insulin? What is Glucagon?

Diabetes is a serious disorder in which cells are unable to get glucose from the blood, resulting in high blood glucose levels.

- Type I = inherited - Type II = obesity, lack of exercise

What is Diabetes Mellitus?

liver

pancreas

liver

blood sugar level (90mg/100ml)

insulin

body cells take up sugar from blood

liver stores sugar

reduces appetite

glucagon

pancreas

liver releases sugar

triggers hunger

high

low

Feedback Endocrine System Control

5. What do the hormones Insulin and Glucagon work together to do?

6. What is Diabetes?