Question

A muscle cell undergoes glycolysis to generate pyruvate. Considering that the cell remains under aerobic conditions and moves on to the ETC via the Krebs cycle, which of the following would be the final electron acceptor in this case?
a. hydrogen
b. nitrate
c. oxygen

Answer 1

The answer is c. oxygen.

Cellular respiration includes glycolysis, link reaction, Krebs cycle, and electron transport chain (ETC), in that order. The main function of ETC is a production of ATP.  In this series of oxidation-reduction reactions, electrons from the previous stages of cellular respiration are taken and transported to the oxygen which is the final acceptor of electrons. As the result, water and ATP are produced.