Examlex
What is the smallest unit of contraction within a skeletal muscle?
Physical Exercise
Any bodily activity that enhances or maintains physical fitness and overall health and wellness.
SA Node
Known as the sinoatrial node, it is the natural pacemaker of the heart located in the right atrium, initiating the heart's electrical impulses.
Pacemaker
A device or biological mechanism that sets the pace or rhythm for certain processes, especially the heart's rhythm.
AV Node
The atrioventricular node, a crucial part of the heart's electrical conduction system, controlling the heart rate by delaying the transmission of electrical impulses from the atria to the ventricles.
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