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Muscle Physiology paper 2 lecture notes £9.66   Add to cart

Lecture notes

Muscle Physiology paper 2 lecture notes

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part 2 of muscle physiology in depth notes

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  • May 3, 2024
  • 3
  • 2023/2024
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  • Dr repechi
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Smooth muscle
- Found in hollow organs and tubes such as airway and blood vessels.
- Has single nucleus per cell.
- Spindle shaped cells.
- Has no sarcomeres like skeletal muscles.

3 types of filaments
1. Thick filament
- Bundles of Myosin
- More heads available for binding (no gap)
- Arranged so it sends filaments in opposite directions rather than in the middle.
2. Thin filaments
- Actin
- Tropomyosin
- No troponin
3. Intermediate filaments
- For structural stability

The filaments are arranged in a cris-cross pattern across the cell and held together and
stabilised by ‘dense bodies’ which replaces Z lines as smooth muscles don’t have
sarcomeres.

When the cell contracts, the thin filaments pass in opposite directions along thick filaments.

In smooth muscle, there is a myosin light chain which wraps around the neck of myosin. This
plays a crucial role because myosin head will only bind to actin when the myosin light chain
is phosphorylated.


1. Release of Ca2+ causes it to bind with a signalling molecule called calmodulin.
2. Calmodulin activates an enzyme called myosin light chain kinase.
3. Myosin light chain kinase adds a phosphate group therefore phosphorylates the
myosin light chain so the cross-bridge cycle can take place.

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