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• Proteins are composed of four elements : carbon , hydrogen , oxygen and nitrogen , sometimes they also contains phosphorus and sulfur.
•The monomers of proteins are called amino acids.
• There are 20 kinds of amino acids
• Proteins can be formed from different combinations of 20 amino acids

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MAIN FUNCTIONS OF PROTEINS  (Catalyst-enzymes)

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MAIN FUNCTIONS OF PROTEINS  (Catalyst-enzymes)

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1. Catalyst (enzymes)
Enzymes are proteins that speed up chemical reactions in the body.

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MAIN FUNCTIONS OF PROTEINS ( Storage protein)

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MAIN FUNCTIONS OF PROTEINS ( Storage protein)

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2. Storage protein Casein – milk protein Ferritin - is the protein in the liver, store the iron.

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3. Hormones
Insulin , FSH, LH insulin is made up of protein. Regulate the blood glucose level.

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MAIN FUNCTIONS OF PROTEINS ( Muscle contraction)

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MAIN FUNCTIONS OF PROTEINS ( Muscle contraction)

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4. Muscle contraction
Actin and myosin are needed for muscles.
•Actin- myosin: is the protein , find in the structure of the muscle for muscle contraction .
•Actin – myosin : find in the structure of the flagellum and cilia for movement of the paremecium , euglane.

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5. Defensive
It is used in structure of the antibodies which is synthesized by White blood cells. Antibodies have two arms that bind to antigens on bacteria or other payhogens.

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7. Receptors
Binding site in the membrane for hormones, neurotransmitters, tastes, smell.

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MAIN FUNCTIONS OF PROTEINS (Transport of nutrients and gases)

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MAIN FUNCTIONS OF PROTEINS (Transport of nutrients and gases)

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6. Transport of nutrients and gases Hemoglobin – transport oxygen, carbondioxide.

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MAIN FUNCTIONS OF PROTEINS (Structural protein: support)

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MAIN FUNCTIONS OF PROTEINS (Structural protein: support)

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8. Structural protein: support
• Example : Keratin – hair, horns, nail , feathers .
• Function : repair the tissue.
• Example : collagen , elastin protein – found in the structure of the bone , cartilage. Function : Tissue streengthening.

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MAIN FUNCTIONS OF PROTEINS (Blood clotting)

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MAIN FUNCTIONS OF PROTEINS (Blood clotting)

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9. Blood clotting
Fibrinogen – plasma proteins involve in blood clotting.

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http://library.open.oregonstate.edu/microbiology/chapter/microbial-nutrition/
https://www.azom.com/article.aspx?ArticleID=11177
https://en.wikibooks.org/wiki/Medical_Physiology/Basic_Biochemistry/Amino_Acids_and_Proteins
https://www.msdmanuals.com/home/blood-disorders/blood-clotting-process/how-blood-clots
https://en.wikipedia.org/wiki/Receptor_(biochemistry)
http://www.austincc.edu/apreview/PhysText/Immuno.html
https://www.google.com.tr/url?sa=i&source=images&cd=&cad=rja&uact=8&ved=2ahUKEwjbsqacnpXfAhXIL1AKHZMSBEsQjRx6BAgBEAU&url=https%3A%2F%2Fopentextbc.ca%2Fanatomyandphysiology%2Fchapter%2F10-3-muscle-fiber-contraction-and-relaxation%2F&psig=AOvVaw31hpfYIms7qIH2sdcib_do&ust=1544530389926743
http://people.upei.ca/bate/html/noteson_ndocrineprinceples.html

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10.Energy
It is used as third source of energy.