karyotype (kar'ei-o-tiip) A set of chromosomes characteristic of a species arranged in homologous pairs. The human karyotype has 23 chromosome pairs. p. 980 keratin (ker'ah-tin) Protein present in the epidermis, hair, and nails. p. 146 keratinization (ker"ah-tin"i-za'shun) The process by which cells form fibrils of keratin and harden. p. 171
ketone body (ke'toin bod'e) Type of compound produced during fat catabolism, including acetone, acetoacetic acid, and betahydroxybutyric acid. p. 741 ketosis (ke"to'sis) An abnormal elevation of ketone bodies in body fluids. p. 875 kilocalorie (kil'o-kal"o-re) One thousand calories. p. 745 kilogram (kil'o-gram) A unit of weight equivalent to 1,000 grams. p. 745 kinase (ki'nas) An enzyme that converts an inactive or precursor form of another enzyme to an active form by adding a phosphate group. p. 508 Krebs cycle (krebz si'kl) The citric acid cycle. p. 114 Kupffer cell (koop'fer sel) Large, fixed phagocyte in the liver that removes bacterial cells from the blood. p. 709 kwashiorkor (kwash"e-or'kor) Starvation resulting from a switch from breast milk to food deficient in nutrients. p. 769
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