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MrMuchimi
3 years ago
15

Describe what happens when a muscle contracts.

Biology
2 answers:
kotykmax [81]3 years ago
6 0
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.
11Alexandr11 [23.1K]3 years ago
5 0

Answer:

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.

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