4.3.1 A AND B F214

4.3.1 A AND B F214

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  • Created on: 14-11-12 11:04
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F214:HORMONES
4.3.1.A.Describe the term endocrine gland, exocrine gland, hormone and target cell
Hormones:
Molecules released by endocrine gland directly into the bladder
Acts as a chemical messenger as hormones carry signals form the endocrine gland to specific
target cells/tissues
E.g. Hormones Insulin/glycogen
Endocrine gland
The endocrine system is another communication system in the body using the blood
circulation to transport the signals/materials throughout the body
Releases/secretes hormones directly into the blood form the endocrine gland
Glands inside the organism which secretes hormones directly into the cell
Ductless gland
-consists of a group of cells that produce/release hormones straight into the blood capillary
running through the gland
Exocrine gland
Gland which secretes molecules into a duct hat carries the molecules to where they want to
be used
E.g. salivary gland secrete saliva into duct Saliva flows along the duct into the mouth
Target cell
Cell receives a hormone (signal) which must process a specific complimentary shaped
receptor on the plasma membrane
Hormones bind to receptors of the target cell
Cells in the body process a certain shape which is complimentary, cell then initiates a
response
4.3.1.B Explain the meaning of the term first messenger and second messenger, with reference
to cAMP
Key terms
Adrenaline
An amino acid derivative
Unable to enter the target cell, therefore causes an affect inside the cell without entering
the cell itself
Adrenaline gland
Adjacent to the kidney
Each gland can be divided into a medulla region and a cortex region
First Messenger
Hormone that transmits signals around the body
Second Messenger
cAMP
Transmit signals inside the celL
Adenly cyclase
Enzymes associates with the receptors for many hormones i.e. adrenaline.

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Found in the inside of the cell surface membrane
Camp (cyclic AMP)
Adrenaline receptors on the outside of the cell surface membrane a shape complimentary to
the shape of the adrenaline molecule
Enzymes adenly cyclase is associated on the inner surface of the cell surface membrane
Adrenaline in the blood binds to a specific receptor on the cell surface membrane.…read more

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