Myofibrils are Composed Primarily Of

Question

Myofibrils are composed primarily of
A)actin and myosin.
B)perimysium and endomysium.
C)troponin and tropomyosin.
D)fascia and tendons.

Accepted Answer

Myofibrils are specialized organelles within muscle fibers that are primarily composed of actin and myosin proteins. These proteins work together to generate muscle contractions. Perimysium and endomysium are connective tissues that surround and support myofibers, while troponin and tropomyosin are regulatory proteins involved in muscle contraction. Fascia and tendons are also connective tissues, but they are not primary components of myofibrils.