Question

1. Muscles Work by
and​

Answer 1

Answer:

Muscles work by contracting and relaxing. Muscles have long, thin cells that are grouped into bundles. When a muscle fiber gets a signal from its nerve, proteins and chemicals release energy to either contract the muscle or relax it. When the muscle contracts, this pulls the bones it's connected to closer together.

Explanation:

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Answer 2

Answer:

muscles work by pair of flexors