HSCI 100 Lecture Notes - Lecture 16: Anterior Pituitary, Pituitary Gland, Posterior Pituitary
17 Mar 2016
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Document Summary
Endocrine glands- secrete their produces directly into bloodstream. Exocrine glands- secrete their products into ducts that carry these products to other organs or outside the body. Mostly comprised of glands that contain secretory cells that release their products, called hormones, into extracellular fluid where they diffuse into the bloodstream. Hormones are not type of chemical messenger of the body. Secretes hormones that move primarily through the blood stream to target cells. Results in a slow but prolonged response. Chemical signals that promote communication b/w cells & body parts. Prostaglandins: local hormones affect neighboring cells & thus are not carried in the blood. Pheromones: chemical signals that influence the behavior of other individuals. Peptides: bind to a receptor in the plasma membrane. Steroids: lipids that enter a cell & affect gene activity. Target cells have receptors, which are protein molecules that recognize & bind specific hormones. Cells other than target ells lack the correct receptors and are unaffected by the hormone.
