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Julia has just started a weight-lifting program. As she lifts a dumbbell, her muscles contract.

describe and elucidate how muscle contraction works at the molecular level:

describe how do actin and myosin interact in the sarcomere to bring about muscle contraction?

What roles do ATP and calcium play?

describe the longer-term effect of Julia's program. describe how will her muscles adapt over time to the change in workload?

Describe what happens to bones as a result of these weight-bearing exercises. Comprise a description of calcium and bone remodeling and how this associates to homeostasis.

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