HAPS

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(ab´duo-men, ab-do´men) The portion of the trunk between the diaphragm and pelvis. abduction

The most common system of classification for red blood cell antigens. On the basis of antigens on the red blood cell surface, individuals can be type A, type B, type AB, or type O. absorption

(ak-ses´uo-re) Organs that assist with the functioning of other organs within a system. accommodation

(as´´ue-tab´yuu-lum) A socket in the lateral surface of the hipbone (os coxa) with which the head of the femur articulates. acetone

(acetyl CoA) (as´ue-tl, ua-set´l) A coenzyme derivative in the metabolism of glucose and fatty acids that contributes substrates to the Krebs cycle. acetylcholine (ACh)

(ua-set´´l-ko´´lu1-nes´tue-r=as) An enzyme in the membrane of postsynaptic cells that catalyzes the conversion of ACh into choline and acetic acid. This enzymatic reaction inactivates the neurotransmitter. Achilles tendon

A substance that releases hydrogen ions when ionized in water. acidosis

(ak´´ro-meg´ua-le) A condition caused by the hypersecretion of growth hormone from the pituitary gland after maturity and characterized by enlargement of the extremities, such as the nose, jaws, fingers, and toes. actin