Refer to the graph showing the capacity of three systems that provide ATP for muscle contraction. A marathon runner relies mostly on
A) the system of curve A.
B) the system of curve B.
C) the system of curve C.
D) anaerobic production of ATP to meet the needs of muscles.
E) the system of curve A generating precursors for system B.

Question

Refer to the graph showing the capacity of three systems that provide ATP for muscle contraction.  A marathon runner relies mostly on
A) the system of curve A. 
B) the system of curve B. 
C) the system of curve C. 
D) anaerobic production of ATP to meet the needs of muscles. 
E) the system of curve A generating precursors for system B.

Quizplus · Accepted Answer

The capacity of system C, which represents aerobic respiration, is the highest and can provide ATP for longer periods of time. Marathon runners rely mostly on aerobic respiration to provide sustained energy for their long-distance race.

Refer to the Graph Showing the Capacity of Three Systems