oxygen to the heart muscle. angiogenesis functional new blood vessel growth. anomaly marked deviation from normal, especially as a result
of congenital or hereditary defects. antiarrhythmic agents cardioactive drugs used to prevent and
treat arrhythmias. anticoagulants blood thinners. anticoagulation to decrease the tendency of the blood to form
a clot, thrombosis. AOO a pacemaker that stimulates the atrium as a fixed rate,
independent of atrial activity. aorta main artery arising from the heart; the branches of the
aorta take blood to all parts of the body. apnea cessation of airflow for at least 10 seconds.
arcomere the contractile unit of a myofibril; sarcomeres are repeating units, delimited by the Z bands, along the length of the myofibril that make up the myocardium of the heart.
arrhythmia general term for an irregularity or rapidity of the heartbeat, an abnormal heart rhythm.
arterial dilatation enlargement or increase in the luminal diameter of the artery.
arterioles small branches of arteries.
arteriosclerosis loss of elasticity and hardening of the artery due to several causes, particularly age change and deposits of calcium; an artery with pipe-like rigidity.
artery blood vessels that carry blood away from the heart to organs, tissues, and cells throughout the body, as opposed to veins, which carry blood from the tissues back to the heart.

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