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