We can move our bodies because of the control we can exert over our skeletal muscles. But for every muscle that we can control, there are numerous others that we cannot. Cardiac muscle and smooth muscle are equally as important to our daily existence, yet we are unable to make them behave according to our will. Both voluntary and involuntary muscles are found throughout our bodies and muscles control some functions you likely never thought of.

Skeletal Muscle

Everyone knows skeletal muscle. It is the muscle type used to do work, move something, or even snap your fingers. Also known as striated muscle because of its striped appearance in the microscope, these are also known as voluntary muscles. Most, but not all, skeletal muscles are attached via tendons to bone. Conscious control from our brains leads to signals that make these muscles contract. When they contract, or shorten, they create force against tendon and bone, causing them to move. Unlike any other type of muscle in the body, skeletal muscles form as a result of many individual muscle precursor cells fusing together. The resulting larger, single cell still contains all of the nuclei from the original cells. Therefore, besides being known as voluntary, or striated, or skeletal muscle, they are also known as multinucleated muscle fibers.

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