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carbuncle
carbuncle acute inflammatory nodule of the skin caused by bacterial invasion into the hair follicles or sebaceous gland ducts. It is actually a boil , but one that has more than one focus of infection, i.e., involves several follicles or ducts. Carbuncles occur more often in men because of their m...
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gall bladder
gall bladder small pear-shaped sac that stores and concentrates bile . It is connected to the liver (which produces the bile) by the hepatic duct. When food containing fat reaches the small intestine, the hormone cholecystokinin is produced by cells in the intestinal wall and carried to the gall b...
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wen
wen benign, slow-growing, painless cyst of the skin resulting from obstruction of the sebaceous gland ducts. It is frequently found on the scalp, ears, face, back, or scrotum. Usually no treatment is required. Large wens may be surgically removed.
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gland
gland organ that manufactures chemical substances. A gland may vary from a single cell to a complex system of tubes that unite and open onto a surface through a duct. The endocrine glands, e.g., the thyroid, adrenals, and pituitary, produce hormones that are secreted directly into the bloodstream (...
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Nicolaus Steno
Nicolaus Steno , Latinized form of Niels Stensen , 1638-86, Danish anatomist, geologist, and Roman Catholic prelate. He lived principally in Copenhagen, Paris, and Florence. He investigated the heart, brain, muscles, and glands and discovered (1661) the excretory duct (duct of Steno) of the parot...
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blackhead
blackhead yellowish or blackish plug of material accumulated in the duct of a sebaceous gland. The material consists of keratin (horny cells of the epidermis) and modified sebum (oily secretions of the sebaceous gland). Blackheads are the primary lesions in acne . Treatment is the same as for acne...
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blackhead
blackhead yellowish or blackish plug of material accumulated in the duct of a sebaceous gland. The material consists of keratin (horny cells of the epidermis) and modified sebum (oily secretions of the sebaceous gland). Blackheads are the primary lesions in acne . Treatment is the same as for acne...
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nephron
nephron (nef-ron) n. the active unit of excretion in the kidney (see illustration). Blood is filtered through the glomerulus into the Bowman's capsule so that water, nitrogenous waste, and many other substances pass into the renal tubule. Here most of the substances are reabsorbed back into the blo...
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salivary glands
salivary glands , in humans, three pairs of glands that secrete the alkaline digestive fluid, saliva, into the mouth. Most animals have salivary glands that resemble those in humans; however, in some animals these glands perform other functions. For example, the salivary glands of many blood-sucking...
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chymotrypsin
chymotrypsin , proteolytic, or protein-digesting, enzyme active in the mammalian intestinal tract. It catalyzes the hydrolysis of proteins , degrading them into smaller molecules called peptides . Peptides are further split into free amino acids . Chymotrypsin is produced in the pancreas as t...
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