One of the major roles of muscles is to create mobility for both the body, and for the nutrients absorbed from a source of food. Muscles allow for the mobility of the human body by converting chemical energy into mechanical energy.
The three main muscle types in the human body are smooth, cardiac, and skeletal muscle. Cardiac muscles are only located within the structure of the heart; cardiac muscles control the contractions of the heart muscle, and they are given the signals to contract by the medulla oblongata in the brain. Smooth muscles are involuntary, indicating that a person is unable to control the action. Along with smooth muscles, the muscles involved in the cardiovascular system are involuntary as well.
In contrast, skeletal muscles are the only voluntary muscle mass in the body, meaning that a person has control over this type of muscle. Skeletal muscles are involved in mobile actives, such as running, walking, jumping, and speaking. Both cardiovascular muscles and smooth muscles contain single nuclei; however, skeletal muscles contain multiple nuclei, accounting for their potentially large length.
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