1. The Endocrine System
Chapter 16

2. How it Works
Endocrine glands are tubeless organs or groups of cells that secrete hormones directly into the bloodstream
Hormones are chemical substances that help regulate many body functions
Carried in the body through the blood
When produced during puberty, they trigger physical and emotional changes

3. The Endocrine System
Thyroid gland - produces hormones that regulate metabolism, body heat, and bone growth
Parathyroid gland - produces a hormone that regulates the body’s balance and phosphorus levels
Testes - male reproductive glands that produce sperm
Ovaries - female reproductive glands that produce eggs
Pineal gland - secretes the hormone melatonin, which is thought to affect the onset of puberty and regulates sleep

4. The Endocrine System
Hypothalamus - links endocrine and nervous systems and stimulates the pituitary gland to secrete hormones
Pituitary gland - regulates and controls the activities of all other endocrine glands
Thymus - regulates development of the immune system
Adrenal glands - produce hormones that regulate the body’s salt and water balance
Pancreas - a gland that serves both the endocrine and digestive systems

5. Class Work - Due Today!
Answer the following in COMPLETE SENTENCES on a separate sheet of paper.
pg. 445 #1-3
pg. 457 #1-5