NUR 313 Lecture Notes - Lecture 11: Cortisol, Vasodilation, Aldosterone
Document Summary
A hormone is a mediator molecule that is released in one part of the body but regulates the activity of cells in other parts of the body. Most hormones enter the interstitial fluid and then the bloodstream. Hormones will circulate the blood but then bind onto the surface of their specific receptors. Response of the endocrine system is slower than that of the nervous system; Exocrine glands can be sebaceous glands, sweat, mucus, and digestive glands. Endocrine gland secrete their products into the interstitial fluid surrounding secretory cells rather than into ducts. From interstitial fluid, it goes to the blood capillaries and then into the blood stream. Images displayed make up the major organs for the endocrine system * * * If a hormone is present in excess, the number of target cell receptors may decrease down regulation. Down regulation makes a target cell with a receptor less sensitive to a hormone.
