The contractile unit of a muscle is the ____.
A) sarcomere
B) myosin head
C) phosphate group
D) myofibril
E) actin filaments

Question

The contractile unit of a muscle is the ____.  
A) sarcomere
B) myosin head
C) phosphate group
D) myofibril
E) actin filaments

Quizplus · Accepted Answer

The sarcomere is considered as the smallest unit of the muscle that is capable of producing contraction. It is made up of actin and myosin filaments arranged in a highly organized pattern. Within a sarcomere, the myosin heads bind to the actin filaments and work together to produce muscle contraction. Therefore, option A is the correct choice.

The Contractile Unit of a Muscle Is the ____