Viruses must enter another cell to do their cellular activities
Indicate whether the statement is true or false
TRUE
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_____ cells create impulses that determine the heart rate
a. Pacemaker b. Conductive c. Working d. Contractile
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When ions diffuse across cell membranes, they move:
a. Down their concentration gradient (from high to low) b. Against their concentration gradient (from low to high)
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