BIO26 chapter 8

BIO26 chapter 8 - Chapter 8 1. Endocrine System a. Includes...

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Chapter 8 1. Endocrine System a. Includes pituitary, thyroid, and adrenal glands. And other important body organs. i. Heart secrets a hormone that stimulates salt and water excretion by the kidneys ii. Brain secrets a number of hormones that relate to the pituitary gland iii. The stomach and intestines secret hormones that regulate the digestive system iv. The adipose tissue secrets several hormones that regulate hunger and metabolism v. The kidneys secret a hormone that regulate red blood cell production by the bone marrow b. Endocrine glands are a set of glands that directly secret hormones into the blood therefore every part of the body feels the hormones c. Target organs- besides the body parts with the correct receptor protein for the hormone, it cannot respond to the hormone. 2. Polar hormones: can dissolve in blood plasma and are delivered straight to their respective body parts. Cannot pass through the plasma membrane require a second messenger to exert their effects. a. Catecholamines. Epinephrine and norepinephrine: secreted by the adrenal medulla, polar catecholamine hormones. (FIGHT OR FLIGHT RESPONSES) b. Polypeptides, proteins and glycoproteins. Insulins (from pancreatic islets, polypeptide), Growth Hormone (anterior pituitary, protein), Luteinizing hormone (anterior pituitary, glycoprotein hormone, *protein bound to a carbohydrate).
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c. Digested before absorbed, therefore must be directly inserted into the blood, 3. Nonpolar hormones: cannot dissolve in blood plasma and are bounded to carrier proteins. a. Steroids: secreted by two endocrine glands: adrenal cortex and the gonads(testes and ovaries) *derived from cholesterol b. Thyroid hormones. (thyroxine) *derived from tyrosine, a non polar amino acid, have iodine as part of their structure. i.
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This note was uploaded on 09/13/2011 for the course BIO 26 taught by Professor Fortes during the Spring '11 term at UCSD.

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BIO26 chapter 8 - Chapter 8 1. Endocrine System a. Includes...

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