7. Which one is the final electron acceptor in the electron transport chain?(A)complex IV(B)oxygen(C)coenzyme Q(D)cytochrome C

13. How does inhibition of the Na+/K+ ATPase increase the force of heart muscle contraction?(A)It increases cytosolic Na+ and therefore decreases Ca2+ export.(B)It increases cytosolic K+ and therefore decreases Ca2+ export.(C)It decreases cytosolic Na+ and therefore decreases Ca2+ export.(D)It decreases cytosolic K+ and therefore decreases Ca2+ export.