Refer to the Graph Showing the Capacity of Three Systems

Multiple Choice

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.