Question

Describe what happens when a muscle contracts.

Can you write a short one for me please like 3 sentences

Answer 1

When a muscle contracts, the actin is pulled along myosin toward the center of the sarcomere until the actin and myosin filaments are completely overlapped.

Answer 2

sliding filament theory. According to this theory, myosin filaments use energy from ATP to “walk” along the actin filaments with their cross bridges. When all of the sarcomeres in a muscle fiber shorten, the fiber contracts.