a muscle is stimulated to contract. This calcium uncovers the actin-binding sites. When the muscle no longer needs to contract, the calcium ions are pumped from the sarcomere and back into storage in the sarcoplasmic reticulum.

There are over 600 skeletal muscles in the human body (exact number varies by counting method) and skeletal muscle makes up ~40% of human mass.

Cardiac

Heart muscle is striated muscle but is distinct from skeletal muscle because the muscle fibers

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