Module 3 - Excitation-Contraction Coupling

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Last updated 8:22 AM on 7/31/26
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9 Terms

1
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Neuromuscular Junction - Process

  1. Vesicles release ACh via exocytosis

  2. Diffuse across synaptic cleft

  3. ACh binds to receptors on motor end plate

  4. Ligand gated channels open

  5. Na diffuse in

  6. Depolarisation

  7. Generate AP

2
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Tension

Force generated by muscle contraction

3
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2 Types of Isotonic Contraction

Concentric - shorten - tension > load

Eccentric - lengthen - tension < load

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Isometric - What + Example

Tension = load

No movement

Posture

5
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Motor Unit

1 motor neuron

Many muscle fibres

Asynchronous

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Summation

Increase/decrease no of nerve impulses

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Recruitment

Add/remove motor units

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Small + precise movements

Less fibres per unit

More units

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Large + less precise movements

More fibres per unit

Less units