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Muscle Action Order

The order for how impulse for muscles form and the muscle contracts then relaxes

Step NumberProcess
Step 1 Nerve impulse is generated in the brain and travels down the spinal cord and reaches a motor neuron.
Step 2 The impulse travels from a motor neuron down its axon to its terminals at the neuromuscular junction.
Step 3 The nerve impulses reaches the terminal, and a neurotransmitter called acetylcholine is released into the synaptic draft.
Step 4 Acetylcholine binds to receptors on muscle cell sarcolemma (Muscle fibre membrane) which open ion channel;s allowing sodium ions to rush into the cell where some potassium ions leak out of the cell.
Step 5 Sodium ions rush into the skeletal muscle cell and get greater in number than potassium ions where those potassium ions then leak out, which creates net positive charge in the cell, depolarisation occurs and potential is made.
Step 6 A deplorarised muscle cell releases its stored calcium ions which flood the cell
Step 7 Tropomyosin inhibitors blocking acting binding sites in sarcomeres combine with calcium ions and gets removed from actin binding sites
Step 8 Myosin fibre heads freely attach to actin binding sites (Requires ATP). Sarcomeres contract and muscle twitches in an all or nothing response developing maximum tension
Step 9 Action Potential travels through the length of the muscle fibre. Permeability of calcium storage sites return, calcium is restores, the Permeability of the sarcolemma is resorted, sodium potassium pumps restore sodium and potassium ions back to normal.
Step 10 Acetylcholine in synaptic cleft is reabsorbed into the axon terminal and muscle resets.
Created by: CommsMKSoz
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