New PDF release: Cells, tissues, and skin

By Douglas B. Light

ISBN-10: 079107630X

ISBN-13: 9780791076309

Cells are the smallest devices in a position to maintaining existence, and so they make up almost each element of the human physique. From the strands of hair on the most sensible of the pinnacle to the nails on palms and feet, each constitution of the human physique consists of cells. teams of cells shape tissues and organs, which permit the physique to operate as an prepared approach. epidermis, the body's biggest organ, types a water-resistant barrier that offers safety opposed to invading microorganisms and acts as a sensory and thermoregulatory constitution. "Cells, Tissues, and epidermis" explores the homes of every of those elements in bodies.

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An antioxidant is a chemical that gives up an electron to a free radical before it has a chance to damage some other molecule, such as DNA. The body produces some natural antioxidants, including the hormone melatonin, which neutralizes some free radicals. In addition, carotenoids, orange pigments in some vegetables (such as carrots and pumpkins), and foods rich in vitamins C and E provide antioxidant activity. Presently, there is much debate concerning the health benefits and risks of supplementing the diet with antioxidant vitamins.

This, in turn, negatively affects brain cells where this enzyme is important for the continual degradation of certain glycolipids. As a result of this disease, undigested lipids accumulate in nerve cells, interfering with the proper functioning of the nervous system. Affected individuals usually show symptoms of listlessness and motor weakness by 3 to 6 months of age. Soon thereafter mental retardation, seizures, and blindness occur. The disease ultimately leads to death, usually within a year and a half of birth.

2). Osmosis is a special case of diffusion. 3). In solutions, solute takes up space that water molecules would otherwise occupy. Thus, a higher concentration of solute means a lower concentration of water. q 6/21/03 1:03 PM Page 38 38 CELLS, TISSUES, AND SKIN solute particles depends only on their number and not their size, kind, or charge. For example, if distilled water were on both sides of a selectively permeable membrane, no net osmosis would occur. However, if the solute concentration on two sides of a membrane differed, the water concentration also would differ.

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Cells, tissues, and skin by Douglas B. Light

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