Two 23 yo identical twin women are members of the track team at their community college. One twin runs the marathon, while the other twin runs the 100-yard dash. A comparison of the leg muscles of these two young women would most likely show which of the following?
A. Little difference because they are identical twins.
B. The motor neurons activating the muscles of the twin that ran the marathon have a greater diameter.
C. The muscles of the twin that ran the marathon are deeper red in color.
D. The muscles of the twin that ran the marathon have a greater concentration of glycogen.
E. The muscles of the twin that ran the marathon have a greater number of fast-twitch fibers.
A. Little difference because they are identical twins.
B. The motor neurons activating the muscles of the twin that ran the marathon have a greater diameter.
C. The muscles of the twin that ran the marathon are deeper red in color.
D. The muscles of the twin that ran the marathon have a greater concentration of glycogen.
E. The muscles of the twin that ran the marathon have a greater number of fast-twitch fibers.