| http://www.w3.org/ns/prov#value | - side of and surrounding the cell ??? ??? ??? intracellular within a cell ??? ??? ??? cellular membrane a layer of protein that surrounds a cell and keeps it separated from the surrounding fluid and cells ??? ??? ??? sinoatrial node SA Node the natural pacemaker of the heart, located in the upper part of the right atrium ??? ??? ??? polarization the resting state, meaning that there is a balance
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