During muscle contractions,____.
A) the sarcomeres lengthen
B) the actin and myosin filaments slide in the same direction
C) the actin filaments move toward the middle of the sarcomere
D) the muscle fibers elongate
E) the muscle fibers are motionless

Question

During muscle contractions,____.  
A) the sarcomeres lengthen
B) the actin and myosin filaments slide in the same direction
C) the actin filaments move toward the middle of the sarcomere
D) the muscle fibers elongate
E) the muscle fibers are motionless

Quizplus · Accepted Answer

During muscle contractions, the actin filaments slide over the myosin filaments, moving toward the center of the sarcomere, which causes the muscle to contract and shorten, not lengthen or remain motionless.

During Muscle Contractions,____