The Area of a Myofibril Where There are No Actin

Question

The area of a myofibril where there are no actin filaments is the ________.
A) A band
B) Z line
C) I band
D) M line
E) H band

Accepted Answer

The H band is the area of a myofibril that is devoid of actin filaments and is found within the A band, where it is flanked by areas containing both actin and myosin filaments. This region only contains myosin filaments and becomes narrower during muscle contraction.