Unformatted text preview: Hormones Although it may seem like a far-fetched notion that a small chemical can enter the bloodstream and cause an action at a distant location in the body, this scenario occurs every day. The ability to maintain homeostasis and respond to stimuli is largely due to hormones secreted within your body. Without hormones, you could not grow, maintain a constant temperature, produce offspring, or perform the basic actions that are essential for life. The endocrine system produces hormones that are instrumental in maintaining homeostasis and regulating reproduction and development. A hormone is a chemical messenger produced by a cell that effects specific change in the cellular activity of other cells (target cells). Unlike exocrine glands (which produce substances such as saliva, milk, stomach acid, and digestive enzymes), endocrine glands do not secrete substances into ducts (tubes). Instead, endocrine glands secrete their glands do not secrete substances into ducts (tubes)....
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- Spring '10