Q: What is the most widely accepted theory explaining how muscle fibers contract?


Read this paragraph and choose the correct option from the provided answers:

The most widely accepted theory explaining how muscle fibers contract is called the sliding filament theory . According to this theory, myosin filaments use energy from ATP to “walk” along the actin filaments with their cross bridges. This pulls the actin filaments closer together. The movement of the actin filaments also pulls the Z lines closer together, thus shortening the sarcomere.

 Choices:

- sliding pigment theoery

- sliding tritium theory

- sliding carbon theory

- sliding filament theory


A:
sliding filament theory