2. The Endocrine System
The endocrine system is composed of glands that secrete hormones into the bloodstream.
Maintains homeostasis
Regulates reproduction and development

3. What are Hormones?
Chemical messengers produced by the cell that effects specific changes in other cells (target cells)
May take a long time to take effect

4. How do hormones travel through the body?
Through the bloodstream

5. Endocrine Glands vs. Exocrine Glands
Exocrine glands secrete substances into tube-like structures
Example
Digestion System
Saliva
Remember from Digestion Video
Milk from Breasts
Stomach Acid
Endocrine Glands secrete substances directly into extra-cellular space.
Substance moves via diffusion

6. http://cti. itc. virginia. edu/~psyc220/kalat/JK324. fig11. 1

7. Pituitary Gland Anterior Pituitary Posterior Pituitary hGH FSH LH
Stimulates growth
FSH LH
Works on gonads telling them to release hormones
Posterior Pituitary
Oxytocin
Uterine contractions; release of milk
ASH
Vascopressin
Increases water retention in the kidneys

8. Hypothalamus Attached to the pituitary gland
Controls secretions in the anterior pituitary
Growth hormone RH
Stimulates release of hGH
Human Growth hormone

9. Disorders with the Pituitary Gland
Too much GH, body will grow too fast
Gigantism
Too little
Dwarfism