Refer to the graph below showing the capacity of three systems that provide ATP for muscle contraction in humans.Based on the diagram,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 below showing the capacity of three systems that provide ATP for muscle contraction in humans.Based on the diagram,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 provide ATP within seconds but is not efficient for sustained activity. Curve A represents the immediate system of ATP and creatine phosphate, while curve C represents the system of oxidative phosphorylation, which uses preformed ATP and creates new ATP from the breakdown of carbohydrates, fats, and proteins. None of the statements are completely true for A, C, or D, but B is the best choice as it accurately describes the system represented by curve B. Curve C also enables fast-twitch fibers to generate force quickly, but this is not enough to make it the correct answer.

Refer to the Graph Below Showing the Capacity of Three