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a substance or compound that provides nourishment (or food) or raw materials needed for life processes
an organic compound that participates in biochemical reactions and that builds various molecules in the body
a natural, usually inorganic solid that has a characteristic chemical composition, an orderly internal structure, and a characteristic set of physical properties
the digestive tract from the mouth to the anus, including the stomach and intestines
the watery fluid that is secreted by the salivary glands of the mouth, that softens and moistens food, and that begins digestion
in flatworms, the muscular tube that leads from the mouth to the gastrovascular cavity; in animals with a digestive tract, the passage from the mouth to the larynx and esophagus
a structure that hangs at the entrance of the larynx and prevents food from entering the larynx and the trachea while swallowing
a lesion of the surface of the skin or a mucous membrane; sometimes occurs in the digestive system
the circular muscle that controls the flow of chyme from the stomach to the small intestine
one of the many tiny projections from the cells in the lining of the small intestine; increases the surface area of the lining for absorption
the outermost portion of the kidney, makes up about a third of the kidney's tissue mass
the principal nitrogenous product of the metabolism of proteins that forms in the liver from amino acids and from compounds of ammonia and that is found in urine and other body fluids
a colorless gas that has an alkaline reaction in water; forms in nature as an end product of animal metabolism (formula, NH3)
the liquid excreted by the kidneys, stored in the bladder, and passed through the urethra to the outside of the body
a tight ball of capillaries that retains cells and large molecules in the blood and passes wastes dissolved in water
a cluster of capillaries that is enclosed in a Bowman's capsule in a nephron of the kidney, where blood is filtered
the long, tubular portion of a nephron that produces and that takes urine to the renal pelvis of a kidney
the process of separating dissolved substances, such as impurities in the blood by passing them through a porous material; occurs between the glomerulus and the Bowman's capsule in the nephrons of a kidney
the process by which the glands of the body release their substances; a substance produced by a gland
loop of Henle
in the kidney, the long, U-shaped part of a nephron that reabsorbs water and salts from the urine collected by the glomerulus
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