Examlex
Energy flow in an ecosystem is ____.
SA Node
The sinoatrial node, a group of cells in the right atrium of the heart that generates the electrical impulses initiating the heart's rhythm.
Bundle Of His
A collection of heart muscle fibers that transmit electrical impulses from the AV node to the ventricles, playing a crucial role in the rhythm and pace of the heartbeat.
Inner Lining
The interior surface layer or covering of an organ, vessel, or structure in the body.
Coronary
Relating to the arteries that supply blood to the heart muscle itself.
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