Is important to the regulation of muscle activity

Yes, it is very important to have the regulation of muscle activity as :

Muscular strength and endurance are important for many reasons: Increase your ability to do activities like opening doors, lifting boxes or chopping wood without getting tire which activities reduce the risk of injury.

This also helps you keep a healthy body weight.

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b) the heart is a pump made of muscle and that is difficult to grow in the lab.