Aseven-year-old not breaks his tibia and requires immobilization by a hard cast for six weeks until the break heals. a potential consequence of this therapy is the atrophy of the..
a. gastrocnemius
b. pectoralis major
c. serratus anterior
d. trapezius

A potential consequence of this type of therapy or healing would be the atrophy of the gastrocnemius muscles. The gastrocnemius muscles are the muscles of the calves. These muscles are involved in all the movements of the lower body and they facilitate mostly our forward movements.

The tibia is the bone that holds the gastrocnemius in place. Without movement for six weeks, muscle atrophy would occur because muscle contractions will not voluntary be done by the individual for the duration of immobilization. 

Difference between normal and abnormal tissue is much clearer on mri than on ct and mri much suitable to view soft tissues