MOTOR NEURON TUBULE PLASMA MEMBRANE ER IONS MYOSIN SITE ACTIN FILAMENT HEAD//0 M

Question

MOTOR NEURON TUBULE PLASMA MEMBRANE ER IONS MYOSIN SITE ACTIN FILAMENT HEAD//0 MYOSIN The diagram below shows a muscle cell and its motor neuron. The locations of key steps in the process of muscle contraction are indicated with numbers 1-7 Drag the labels onto the flowchart to identify the sequence of steps that occurs during muscle contraction. The step numbers correspond to the numbers in the diagram above. Reset Help 0 Endoplasmic reticulum (ER) roleases calcium ons. Action potential in the motor neuron triggers an action potential in the muscle cell. Action potential spreads down tubules in the muscle cell. 6 When action potentials stop, calcium ions are pumped back into the ER Myosin heads bind to actin and shorten the Myosin-binding sites are blocked, and the muscle relaxes 4 Calcium lons bind to protein complex on thin (actin) filament, exposing myosin-binding sites.

Explanation / Answer

Answere :

The steps for muscle contraction is given below :

1. Action potential in the moter neuron triggers an action potential in the muscle cell.

2. Actiion potential spread down tubules in the muscles cells.

3. Endoplasmic reticulum releases calcium ions

4. Calcium ions bind to the protein complex on thin (actin) filament, exposing myosin binding site.

5. Myosin head bind to the actinand shorten the sarcomere.

6. When action potential stops, calcium ions pump back into the ER.

7. Myosin-binding sites are blocked, and muscles releases.

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