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

.Describe and explain how muscle contraction works at the molecular level:

. How do actin and myosin interact in a sarcomere to bring about muscle contraction?

. What roles do ATP and calcium play?

. Describe the longer-term effect of Julia’s program.

.How will her muscles adapt over time to the change in workload?

.Explain what happens to bones as a result of these weight-bearing exercises.

.explanation of calcium and bone remodeling and how this relates to homeostasis.

 
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