which ions mediate the upstroke, plateau, and downstroke of a cardiac action potential.
indicate the contraction phase that correlates to these events CORRECT ANS-
upstroke=sodium; depolarization
plateau=calcium; contraction
downstroke=potassium; relaxation
what are the three layers of the heart? CORRECT ANS-epicardium, myocardium,
endocardium
what is the fluid filled sac called that surrounds the heart? CORRECT ANS-pericardium
when red blood cells get broken down, the iron molecule is transferred from the macrophage
to the liver with which transfer protein? CORRECT ANS-transferrin
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