Nancy Caroline 8th Edition Chapter 8 (Anatomy and Physiology

ABO system - The commonly used blood classification system, based on the antigens present or absent in the blood. accessory muscles - The muscles not normally used during normal breathing; include the sternocleidomastoid muscles of the neck, the pectoral is major muscles of the chest, and the abdominal muscles accommodation - The ability of the lens of the eye to change its shape to focus on a close object Acetabulum - The socket formed by the coral (hip) bone into which the ball-shaped femoral head fits snugly Acetylcholine - A neurotransmitter released at synapses within the autonomic nervous system and by motor neurons to stimulate skeletal muscle contraction. Acetylcholinesterase - An enzyme found in the central nervous system, in red blood cells, and in motor endplates of skeletal muscle that causes the decomposition of acetylcholine. Acid - Any molecule that can give up a hydrogen ion, and therefore increases the concentration of hydrogen ions in a water solution. Acidosis - A pathologic condition resulting from the accumulation of acids (increase in extra cellular H+ ions) in the body; a blood pH of less than 7.35