Examlex
What is the name of the custom by which a widower marries the sister of his deceased wife?
Pericardial Cavity
A fluid-filled space that surrounds the heart and provides protection and lubrication, allowing the heart to beat in a relatively frictionless environment.
Epicardium
A thin layer of tissue that forms the outermost part of the heart's wall.
Depolarization
The process in which the resting membrane potential of a cell becomes less negative, making the cell more likely to fire an action potential.
Pacemaker Cells
Specialized heart cells that generate and regulate the heart's rhythm.
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