An animal's locomotor muscle was dissected and the percentages of fast and slow fibers were determined and plotted in the figure below. Which of the following muscles is the likely source for this data?
A)flight muscles of a migratory bird
B)thigh muscles of a marathon runner
C)neck muscles of a chimpanzee
D)jumping muscles of a frog

Question

An animal's locomotor muscle was dissected and the percentages of fast and slow fibers were determined and plotted in the figure below. Which of the following muscles is the likely source for this data? 
A)flight muscles of a migratory bird 
B)thigh muscles of a marathon runner 
C)neck muscles of a chimpanzee 
D)jumping muscles of a frog

Quizplus · Accepted Answer

The graph shows a high percentage of fast fibers and a low percentage of slow fibers, which is typical of muscles involved in quick bursts of activity such as jumping. Option A, flight muscles of a migratory bird, would show a high percentage of slow fibers for prolonged endurance. Option B, thigh muscles of a marathon runner, would show a balance of both fibers for slower, long-distance endurance. Option C, neck muscles of a chimpanzee, would show a mix of slow and fast fibers for strength and stability in the upper body.

An Animal's Locomotor Muscle Was Dissected and the Percentages of Fast