Importance of the Endocrine System 8.1

Hormones chemical regulators produced by cells in one part of the body that affect cells in another part of the body endocrine hormones are secreted by endocrine glands directly into the blood

Endocrine System (Image on next slide from:

Endocrine vs. Nervous both systems integrate and control organs and tissues nervous system helps body to adjust quickly to changes endocrine system maintains control over longer periods of time

Types of hormones nontarget hormones affect many cells throughout the body, e.g., growth hormone target hormones affect specific cells or tissues, e.g., ADH

Steroid vs. Protein Hormones differ in their chemical structure and their action steroid hormones are made from cholesterol, e.g., testosterone, estrogen protein hormones have chains of amino acids and are water-soluble, e.g., insulin

Steroid Hormones (Image from:

Animation… Narrated animation of steroid hormone action: hill.com/olcweb/cgi/pluginpop.cgi?it=swf ::535::535::/sites/dl/free/ / /bio46.swf::Mechanism%20of%20 Steroid%20Hormone%20Actionhttp://highered.mcgraw- hill.com/olcweb/cgi/pluginpop.cgi?it=swf ::535::535::/sites/dl/free/ / /bio46.swf::Mechanism%20of%20 Steroid%20Hormone%20Action

Protein Hormones (Image from:

Animation… Narrated animation of protein hormones: hill.com/sites/ /student_view 0/chapter10/animation__second_messe nger__camp.htmlhttp://highered.mcgraw- hill.com/sites/ /student_view 0/chapter10/animation__second_messe nger__camp.html

The Master Gland

Pituitary Gland (Image on previous slide from: willi+syndrome&qpvt=prader+willi+syndrome) secretes hormones that control other endocrine glands produces and stores hormones, and is under the nervous control of the hypothalamus

Pituitary Gland (Image from:

Pituitary Gland posterior lobe stores and releases hormones produced by the hypothalamus (ADH and oxytocin) anterior lobe produces and stores and releases hormones (growth hormone, TSH, ACTH, prolactin, MSH, FSH and LH)

Releasing Factors produced in hypothalamus control the release of hormones from the anterior pituitary dopamine inhibits secretion of prolactin somatostatin inhibits secretion of somatotropin (growth hormone)