Examlex
A primary "antigen presenting cell," a cell that presents an antigen to a helper T cell,is a:
Ascending Aorta
The portion of the aorta that rises upwards from the heart, delivering oxygenated blood to parts of the body above the heart.
Anterior Interventricular Artery
A blood vessel that delivers oxygenated blood to the front of the septum and both ventricles of the heart.
Electrical Excitation
The process by which an electrical impulse stimulates a nerve cell, muscle, or other excitable tissue to produce an action potential.
AV Bundle
The bundle of His, a collection of heart muscle cells specialized for electrical conduction, transmitting impulses from the atrioventricular node to the ventricles of the heart.
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