1. January 24, 2017
Journal: What is the function of the endocrine system?
After you complete this journal, hand in your journals. You should have at least 15 entries.

2. Introduction to the Endocrine System

3. Endocrine System
Series of organs and glands that secrete hormones into your bloodstream

4. What does the Endocrine System control?
Growth & development
Reproduction
Reducing body stress
Maintaining water and nutrient balance
Regulating cellular metabolism and energy balance
Maintain homeostasis

5. Endocrine Glands

6. Hypothalamus, Pituitary Glands, and Pineal Gland

7. Thyroid & Parathyroid Gland

8. Capsule
Adrenal Glands

9. Pancreas

10. Ovaries and Testes

11. Hormones
Chemical messengers released by endocrine glands that are released into the blood stream and travel all over your body
Cause a widespread response

12. Chemical Messenger Comparison
Neurotransmitters
Hormones
Chemical Messenger
Released at chemical synapse
Released into bloodstream
Intended for close target
Travels to distant targets
Effect happens quickly
Effect takes time
Effect wears off quickly
Effect lasts longer
Affects single cell
Affects many cells

13. How Hormones Work
Hormones bind to receptors on the outside or inside of target cells
If the receptor is on the outside…
It changes cell membrane permeability
It changes enzyme activity inside the cell
If it binds to receptors inside the cell…
Its called a steroid
Interact directly with the cell’s DNA to change cell activity

14. Control of Endocrine Activity
Most endocrine organs are active all the time, but the amount of hormone produced changes
Homeostasis including the amount of hormones produced is regulated through positive and negative feedback loops

15. Control of Hormones Neural Control
Hormone levels controlled by the nervous system
Ex: Adrenal gland secretes hormones to prolong sympathetic response

16. Control of Hormones Hormonal Control
Glands are arranged in a hierarchy and each regulate the gland below them in the chain

17. Control of Hormones Humoral Control
Hormone levels controlled by body fluids