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Myosin is a protein found in muscle that functions in contraction of muscles.

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Actin is a family of globular multi-functional proteins that form microfilaments in the cytoskeleton, and the thin filaments in muscle fibrils.
Example: Fish

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A type of protein found on epithelial cells, which line the inside and outside surfaces of the body. Keratins help form the tissues of the hair, nails, and the outer layer of the skin.

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Tubulin is the protein that polymerizes into long chains or filaments that form microtubules, hollow fibers which serve as a skeletal system for living cells.

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In the small intestine, trypsin breaks down proteins

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stomach enzyme that serves to digest proteins found in ingested food.

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used in the small intestine to break down proteins into individual amino acids

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Protect the body from foreign pathogens

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transferring oxygen from the lungs to the tissues.

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It is responsible for skin strength and elasticity, and its degradation leads to wrinkles that accompany aging.

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cause the release of cortisol, a hormone that helps the body cope with stress, while growth hormone regulates the production of many tissues in the body.
Example of peptide hormone

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Coordinate the activity of different body system

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Is hormone secreted by parathyroid glands that serum calcium contraction through its effects on bone, kidney, and intestine.

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Coordinate the activity of different body systems

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Increases blood glucose levels

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Main function is to hydrolyze the glycosidic bonds in starch molecules converting complex carbohydrates to simple sugars.

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waste removal
Example: urinary system

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In mitochondria as a key participant in the life-supporting function of ATP synthesis.
Example:

Cytochrome P450

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Maintain colloid osmotic pressure.