Endocrine System
Endocrine System Overview Glands: Major organs of the endocrine system Glands makes hormones Hormones: chemical signals Hormones move through bloodstream Hormone attaches to cell receptor Target cells produce proteins
Steroid Hormones 1) Diffuses into target cell 2) Attaches to receptor inside the cell 3) Hormone enters the nucleus 4) Proper protein created
Nonsteroid Hormones
Major Glands All the below create hormones Hypothalamus Stimulates the pituitary gland to release hormones Controls growth, reproduction, body temp Pituitary gland Controls cell growth Stimulates other glands Thyroid gland Regulates metabolism, growth, development Thymus Allows WBCs to mature to fight infection
Major Glands Adrenal Glands Controls “fight or flight” response Increases breathing, alertness, blood pressure Epinephrine Pancreas Controls glucose level in blood Insulin, glucagon Gonads: influence sexual development Testes (males): testosterone Ovaries: Estrogen, progesterone
cold hormone A hormone B hormone C
Effects of testosterone
hypothalamus Pituitary gland Thyroid thymus Adrenal glands pancreas ovaries testes