10. How many ATP molecules can be synthesized when each electron pair is donated by FADH2 in oxidative phosphorylation?(A)1(B)2(C)3(D)4

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.