Biology-Hormones

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  • Created by: toloo
  • Created on: 18-09-13 11:30
Signalling by using hormones Endocrine system= uses blood circulation to transport its signals. How are hormones released into the blood?
Signals released by endocrine system= Hormones. They are released through endocrine glands (ductless glands- produce and release hormones straight into the blood capillaries through the gland
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Endocrine or Exocrine?
ENDOCRINE: release or secrete their hormones directly into the blood. EXOCRINE: Do not release hormones, the small tube carries the secretion to another place. e.g salivary gland
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Targeting the Signal
Cells recieving a hormone must possess a specific complementary receptor on their plasma membrane. Hormone binds to receptor, This allows hormones to travel in the blood without affecting other cells, the cells with the specific receptor=target cell
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The nature of hormones
PROTEIN AND PEPTIDE : derivatives of amino acids (insulin&glucagon) not soluble dont enter cell STERIOD: sex hormones pass through membrane and affect DNA
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The action of Adrenaline (amino acid derivative).- Unable to enter target cell
receptor on outside of cell surface, complemtary shape TO adrenaline molecule. Adrenaline in blood binds to specific receptor, adrenaline= first messenger. when it binds it activates adenyl cyclase, converts ATP TO CYCLIC amp (CAMP) second messenge
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Function of adrenal glands, Adrenal Medulla
medulla=centre manufacture and relsease hormone in response to shock. Relaxes soomth muscle in bronchioles, increases stroke vol of heart &rate stimulate conversion of glycogen to glucose, dilate pupils, increase mental awareness, inhibit action of
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Function of adrenal glands, Adrenal Cortex
Uses cholesterol to produce certain steroid hormones. MINERALCORTICOIDS(aldosterone) control concentration of NA & K in blood. GLUCOCORTICOIDS(cortisol) control metabolism of carbohydrates & proteins in liver.
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Other cards in this set

Card 2

Front

ENDOCRINE: release or secrete their hormones directly into the blood. EXOCRINE: Do not release hormones, the small tube carries the secretion to another place. e.g salivary gland

Back

Endocrine or Exocrine?

Card 3

Front

Cells recieving a hormone must possess a specific complementary receptor on their plasma membrane. Hormone binds to receptor, This allows hormones to travel in the blood without affecting other cells, the cells with the specific receptor=target cell

Back

Preview of the back of card 3

Card 4

Front

PROTEIN AND PEPTIDE : derivatives of amino acids (insulin&glucagon) not soluble dont enter cell STERIOD: sex hormones pass through membrane and affect DNA

Back

Preview of the back of card 4

Card 5

Front

receptor on outside of cell surface, complemtary shape TO adrenaline molecule. Adrenaline in blood binds to specific receptor, adrenaline= first messenger. when it binds it activates adenyl cyclase, converts ATP TO CYCLIC amp (CAMP) second messenge

Back

Preview of the back of card 5
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