1. Endocrine System

2. Endocrine System What is the purpose?
to regulate body activities through the use of chemicals known as hormones
a hormone is a chemical produced by a gland that affects the activities of other organs or tissues

3. Endocrine System

4. hormones work through a lock-n-key system
Endocrine System
hormones work through a lock-n-key system

5. Glands and Hormones Gland Hormone Affect on the Body Hypothalamus
Regulatory chemicals
Regulates the activities of other endocrine glands
Pituitary
HGH – human growth hormone
Gonad hormone
Stimulates bone growth
Stimulates development of sex organs
Adrenals
Adrenaline
Increases heart rate, blood pressure and breathing rate
Thyroid
Thyroxine
Increases rate of metabolism
Pancreas
Insulin
Glucagon
Decreases blood sugar level
Increases blood sugar level
Ovaries
Estrogen
Progesterone
Produces female secondary sex characteristics
Promotes growth of uterine wall
Testis
Testosterone
Produces male secondary sex characteristics

6. Endocrine System
Negative Feedback System – hormones work together in opposition; as one increases the other decreases to create a balance
Example: In the diagram ACTH and Glucocorticoids are working in opposition to control the adrenal response; when the body is stressed more adrenaline is needed