1. Endocrine System An organ system

2. AIM What is a “hormone” and how does it affect target cells?

3. Body System (organ system) Review Respiratory-

4. Body System (organ system) Review Respiratory- breathing system for cellular respiration Circulatory- transportation system Digestive- breaks down food into organic monomers for cellular respiration Immune- defense system against foreign pathogens Endocrine- Cellular communication system

5. Endocrine System The endocrine system is made up of glands that release chemical messages into the bloodstream. These chemicals are called hormones

6. Hormones Chemicals that travel through the bloodstream and affect the activity of other cells. Hormones only affect specific cells. The cells that a particular hormone affects are called target cells.

7. Receptor Molecules A hormone will only affect cells with matching receptor molecules on their surface. If a cell does not have the special receptor molecule, the hormone will not affect the cell.

10. SPECIFIC Hormones are… SPECIFIC We’ve officially learned all of the “specifics!” WHAT ELSE IS “SPECIFIC”???

11. The SPECIFICS Enzymes catalyze a SPECIFIC chemical reaction and fit like a lock and key with a SPECIFIC substrate AntiBodY fits SPECIFIC antigen! Receptor molecules fit SPECIFIC hormones!

12. DRAW IN BOXES Enzyme/substrate Antibody/antigen Hormone/Receptor Molecule

13. Receptor Molecules When a hormone is accepted by a specific receptor molecule, the target cell will respond to the message. Responses to hormones are usually slow and long lasting. Changes in the cell take place over time.

15. Glands of the Endocrine System There are various glands around the human body that secrete hormones into the blood stream. Secrete- release, “leak into”

16. Pituitary Gland Thyroid Pancreas Adrenal Glands Pancreas Ovaries Tests

17. Pituitary Gland Thyroid Pancreas Ovaries Testes Adrenal Glands

18. Homeostasis Hormones are secreted to cause changes that help maintain homeostasis