The ability of a muscle to contract and relax is dependent on the flow of calcium out of and into its storage site in the muscle cell.
Microfilaments travel over thick filaments as muscles flex.
- The sliding filament theory describes how muscles contract. Myofilaments within your muscle fibers grasp hold of one another and slide to create a muscular contraction during this phase.
- However, without the presence of calcium, this is not possible. The myofilaments that cause a contraction are actin and myosin.
- Myosin grabs hold of actin via a myosin crossbridge, which resembles a small arm, to alter the form of the muscle.
- The tropomyosin molecule prevents the crossbridge from attaching at the precise location where it is required to do so. In addition to being connected to actin, tropomyosin is also connected to troponin.
- Calcium is released into the fiber in response to nervous system stimulation for a contraction.
- It associates with troponin and induces it to shift tropomyosin, revealing the myosin cross bridge's binding location. The muscle can now contract since calcium is present.
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