1. ENDOCRINE SYSTEM

2. DEFINITION Ductless gland Exerts chemical control over the human body Maintains homeostasis Acts with nervous system to coordinate the body's activities Uses chemical messengers called hormones that are transported by the circulatory system (blood)

3. HORMONES AMINO ACIDS- simplest form - epinephrine and norepinephrine, oxytocin and vasopressin PROTEIN HORMONES – insulin and gonad STEROID HORMONES- lipids -cortisol, estrogen and testosterone

5. NEGATIVE FEEDBACK Chemical control of the body functions When the concentrations of a particular hormone reaches a certain level in the body, the endocrine gland that secreted that hormone is inhibited (the negative feedback) The secretion of that hormone decreases significantly

6. HYPOTHALAMUS

7. DEFINITION Inferior part of the diencephalon *DIENCEPHALON- one of the major parts of the brain containing the thalamus and hypothalamus Control center of all autonomic regulatory activities of the body

8. Functions: Main function is homeostasis *HOMEOSTASIS - maintaining the body’s internal environment Plays a major role in controlling the secretions from the pituitary gland * INFUNDIBULUM – connects the floor of the hypothalamus to the pituitary gland Sends neural and chemical signals to the pituitary gland

14. Stimulates the release of hormones

17. Secretion of another pituitary hormone called prolactin

19. Luteinizing hormone (LH)

20. Follicle-stimulating hormone (FSH)

21. Stimulates ovulation in the female ovary

23. Growth hormone-releasing hormone

24. Stimulates cell metabolism in most tissues of the body causing cells to divide and increase in size