Which of the Following Statements Are True of Energy Sources

Multiple Choice

Which of the following statements are true of energy sources for muscle contraction? (Read carefully and select all of the correct statements.)

A) The most abundant energy source is ATP.
B) The direct (immediate) energy source is glycogen.
C) When creatine phosphate is used for energy, the waste product urea is formed.
D) Glycogen is stored in muscles for use during exercise.
E) The first step in the use of glycogen for energy is its conversion to glucose
F) The energy from creatine phosphate is used to make more ATP.