Refer to the graph showing the capacity of three systems that provide ATP for muscle contraction. Based on the graph, which statement is true?
A) The system of curve A metabolizes carbohydrates to pyruvate and lactate.
B) The system of curve B comes on line within seconds but lacks sustained efficiency.
C) The system of curve B uses ATP produced by oxidative metabolism.
D) The system of curve C uses preformed ATP and creatine phosphate.
E) The system of curve C enables fast-twitch fibers to generate force quickly.

Question

Refer to the graph showing the capacity of three systems that provide ATP for muscle contraction.  Based on the graph, which statement is true?
A) The system of curve A metabolizes carbohydrates to pyruvate and lactate. 
B) The system of curve B comes on line within seconds but lacks sustained efficiency. 
C) The system of curve B uses ATP produced by oxidative metabolism. 
D) The system of curve C uses preformed ATP and creatine phosphate. 
E) The system of curve C enables fast-twitch fibers to generate force quickly.

Quizplus · Accepted Answer

Curve B represents the system of anaerobic glycolysis, which can come online within seconds but lacks sustained efficiency. Curve A represents the phosphagen system, which uses preformed ATP and creatine phosphate, while curve C represents the oxidative system, which enables slow-twitch fibers to generate force for prolonged periods. Therefore, options A, C, D, and E are incorrect based on the information provided by the graph.

Refer to the Graph Showing the Capacity of Three Systems