In regard to actin(the thin filaments) and myosin (the thick filaments), how do muscles contract?

The globular heads of myosin tie actin, framing cross-spans between the good and bad fibers. This development slides the actin fibers from the two sides of the sarcomere toward the M line, shortening the sarcomere and bringing about muscle withdrawal.

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b) the inside picture would look at a very high temperature in a very low ph