Question

multiple choice question
during the contraction of muscle cells, which fiber is used?
actin
intermediate filaments
microtubules

Explanation:

Muscle contraction involves the interaction of actin and myosin filaments. Actin is a key - component in the sliding - filament mechanism of muscle contraction. Intermediate filaments and microtubules are not directly involved in muscle contraction.

Answer:

A. Actin