Muscle Contraction

Muscle Contraction \ Mechanism
Muscle contraction is the tightening, shortening, or lengthening of muscles when you do some activity. Muscle contraction is often followed by muscle relaxation, when contracted muscles return to their normal state.
The Muscle contraction includes the following processes:
In this module, you will learn about the mechanism of muscle contraction.
• The sliding filament theory is the most accepted theory which best explains the
mechanism of muscle contraction.
• A motor neuron carries signal from the CNS to the muscle fibre, which
generates an action potential.
• The action potential causes the release of calcium ions from the sarcoplasmic
reticulum.
• Calcium ions bind to troponin on actin, thus exposing the binding sites for
myosin.
• The myosin heads bind to the actin, forming a cross-bridge that pulls the actin
filaments causing them to slide over the myosin filaments. Thus, causing
contraction.
• Once the motor neuron stops sending the signals, calcium ions are returned
back to the sarcoplasmic reticulum. This inactivates the actin; cross-bridges
are broken and the muscles relax.
• Muscle fibres are classified as red muscle fibres and white muscle fibres
depending on the amount of red-coloured myoglobin in them.
The video covers the following topic:
- muscle contraction types
- muscle contraction steps
- muscle contraction process
- mechanism of muscle contraction class 11
- muscle contraction
- mechanism of muscle contraction
- locomotion and movement class 11
AASOKA provides 2D/3D educational videos based on the CBSE curriculum that will help you understand difficult concepts and complicated experiments in a simple, easy-to-understand way. You can check all available videos of this grade and to get more clarity, or for progression of difficulty in different topics of this subject, you can check out the given playlists available on our channel:
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Pharmacist here :) Thank you for sharing this video MBD Alchemie- I just wanted to mention one point that think is missing here. The action potential causes the release of Na+ Ions, which then activates a Na+ Ion channel to open the ion gated channel to allow Ca2+ influx, which the rest of the information follows. Hence, the AP doesn't directly open the Ca2+ gated ion channel. Many thanks,

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The animation is very well done! However, I just want to make an observation, in order to improve the information: in the motor end plate, acetylcholine opens sodium channels to promote depolarization and this cation wave will cause the release of calcium that is inside the sarcoplasmic reticulum to the sarcoplasm. The calcium ions shown on the motor endplate cause confusion, as if these ions are responsible for the depolarization

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