Respuesta :
Answer:
Explanation:
Muscle contraction is stimulated by the movement of an action potential moving along a nerve fiber to the muscles. This event follow some series of process before being stimulated.
1. The impulse arrives at the synapse and travels through the transverse tubules.
2. The muscle impulse reaches the sarcoplasmic reticulum and calcium is released.
3. Calcium floods the sarcoplasm and binds to troponin molecules leaving active sites.
4. Tropomyosin molecules bind to exposed active sites, linking actin and myosin.
5. Thin filaments are pulled over the thick filaments.
6. The muscle fiber shortens and contracts.
The steps with respect to the contraction should be shown in the correct way.
- The impulse should arrive at the synapse & travel via the tubules of the transverse.
- The impulse of muscle reached to the sarcoplasmic reticulum & calcium should be released.
- The calcium foods should be treated as the sarcoplasm & bounded into the tropoinn molecules that left active sites.
- The binding of Tropomyosin molecules into the exposing of active sites, actin connected & myosin.
- Thin filaments should be pulled over to the filaments that are thick.
- The fiber of muscle should be short and contracts.
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