1. The Endocrine System

2. Nerves deliver messages electrically while hormones deliver messages chemically.

3. Overview Glands of the endocrine system secrete hormones as chemical messengers (hormones). About 100 different hormones have been identified. The pituitary, pancreas, thyroid, adrenals, and gonads are a few of the endocrine glands.

4. Pituitary The pituitary gland is considered our master gland, which produces hormones to direct growth and sexual development.

5. Gonads In females, the ovaries produce estrogen. In males, the testes produce testosterone.

6. Adrenals Produce cortisol, which stimulates the body to waken. Adrenaline and noradrenaline are produced and affect the feelings of fear and anger.

7. Thyroid Influences the rate at which we process food and burn fat.

8. Pancreas Produces insulin and glucagon, which regulate sugar levels in the blood.  Insulin reduces the level  Glucagon raises the level.

9. Checkpoint Endocrine System Where in the body are hormones produced? a.pituitary b.pancreas c.reproductive organs d.thyroid e.all of the above

10. Checkpoint Endocrine System Where in the body are hormones produced? e.all of the above

11. Checkpoint Endocrine System Which gland is considered the “master” gland? a.gonads b.adrenal gland c.hypothalamus d.pituitary gland e.estrogen gland

12. Checkpoint Endocrine System Which gland is consider the “master” gland? d.pituitary gland

13. Checkpoint Endocrine System The pancreas _______. a.secretes cortisol into the blood b.secretes epinephrine c.secretes the hormones insulin and glucagon into the blood d.does none of the above

14. Checkpoint Endocrine System The pancreas _______. c.secretes the hormones insulin and glucagon into the blood

15. Feedback loops Feedback loops are chemical messages that turn on (positive) or off (negative) hormone systems in order to maintain homeostasis.  Function is like a thermostat maintaining temperature.

16. Summary: Write a paragraph explaining how the nervous system responding to stimuli is similar to the endocrine glands secreting hormones in feedback loops.  Remember homeostasis (hint feedback loops).