________ is the backup energy molecule that can be rapidly converted to ATP in active skeletal muscle.
A) Protein
B) Glucose
C) Fatty acid
D) Phosphocreatine

Question

Quizplus · Accepted Answer

Phosphocreatine, also known as creatine phosphate, is the backup energy molecule that can be rapidly converted to ATP in active skeletal muscle. When a muscle cell needs energy quickly, phosphocreatine donates a phosphate group to ADP to create ATP, which can then be used for muscle contraction. Glucose and fatty acids can also be used as energy sources, but they require more steps to be converted to ATP and are not as immediately available as phosphocreatine. Protein is not typically used as an energy source in muscle cells.

________ Is the Backup Energy Molecule That Can Be Rapidly