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TEA [102]
3 years ago
13

Which describes step three of a muscle contraction?

Biology
1 answer:
masha68 [24]3 years ago
8 0
The answer is step 3. Nerve impulse on a muscle cell induces release of calcium ions

Steps of a muscle contraction are:
1. Nerve impulse travels down the axon and causes a release of acetylcholine.
2. Acetylcholine binds to the receptor of a muscle cell.
3. Nerve impulse on a muscle cell induces a release of calcium ions.
4. Calcium ions induce exposing of myosin to actin.
5. Sliding of actin filaments past myosin filaments.
6. The muscle contract.
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