click below
click below
Normal Size Small Size show me how
A&P1-8 Endocrine Sys
Ch 8: Endocrine System
| Term | Definition |
|---|---|
| Androgens | Hormones produced by the adrenal cortex; responsible for male secondary sex characteristics & for sex drive in both genders |
| Autocrine | The secretion of a hormone by the cells of the same tissue that it targets |
| Down-regulation | A decrease in the number of receptors for a given hormone, causing the cell to become less sensitive to the hormone |
| Endocrine | Refers to hormones that travel through the blood to get to their target tissue |
| Gland | A structure on its own or groups of cells within an organ that function to produce hormones |
| Glucocorticoids | Hormones produced by the adrenal cortex that stimulate the breakdown of protein and fat to make glucose, suppress the immune system, and reduce inflammation |
| Gonads | Ovaries in women, testes in men |
| Half-life | The length of time it takes for one-half of a substance to be eliminated from the cardiovascular system |
| Hormone | Chemical used in the endocrine system to carry messages |
| Mineralocorticoids | Hormones produced by the adrenal cortex that promote sodium and water reabsorption and potassium excretion in the kidney to maintain blood volume and pressure |
| Pancreatic islets | 1-2 million groups of endocrine cells in the pancreas that produce the hormones insulin and glucagon |
| Paracrine | Term that refers to hormones that work on neighboring cells without having to go through the blood to get to the target tissue |
| Pheromone | Term that refers to chemicals that cause a response outside the body, in another individual |
| Plasma protein | Transport protein (made by the liver) that binds to a hormone in the blood to extend its half-life |
| Receptor | Shape-specific binding site for a hormone |
| Second messenger | Chemical created by the binding of a hormone in a receptor on the cell membrane; the second messenger carries the information to where it is needed in the cell to initiate the function of the hormone |
| Secondary sex characteristics | Gender-specific characteristics developed at puberty due to estrogen in females and testosterone in males. |
| Target tissue | Cells of a tissue that have receptors for a specific hormone |
| Thyroid hormone | Collective term for the chemicals T3 and T4; their function is to increase metabolism in most tissues |
| Up-regulation | An increase in the number of receptors for a given hormone, causing the cell to become more sensitive to the hormone |