Endocrine System
- Created by: Georgina
- Created on: 21-11-12 14:48
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- Endocrine System
- hormone = a molecule released into the blood that acts as a chemical messenger
- 2 types
- steroid eg. sex hormones
- protein and peptide eg. adrenaline, insulin and glucagon
- not soluble in phospholipid membrane
- 2 types
- target tissue = cells that have receptors in their plasma membrane complementary in shape to specific hormone molecules
- first messenger = a hormone that acts as a message in the bloodstream eg. adrenaline
- second messenger = chemical inside the cell released in response to a hormone binding to membrane eg. cAMP
- Adrenal glands
- medulla - manufacture and release adrenaline
- increases heart rate
- dilates pupils
- vasoconstriction to raise blood pressure
- cortex
- uses cholesterol to produce steroid hormones
- mineralocorticoids - control concn of K+ and Na+
- Glucocorticoids - control metabolism of carbohydratesand proteins
- uses cholesterol to produce steroid hormones
- medulla - manufacture and release adrenaline
- hormone = a molecule released into the blood that acts as a chemical messenger
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