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the cone-shaped region of the renal medulla, made up of the loops of Henlé and the collecting tubules of nephrons.
a lateral meristem in the vascular tissue of plants. The vascular cambium is the source of both...
the volume of air that is inhaled and exhaled during normal breathing.
a black substance that coats the lungs of a smoker, causing cancer of the respiratory tract.
a connected network of vessels and glands, which carry lymph throughout the body.