Jim Fitch decided that his physique left much to be desired, so he joined a local health club and be

. Jim Fitch decided that his physique left much to be desired, so he joined a local health club and began to "pump iron" three times weekly. After three months of training, during which he was able to lift increasingly heavier weights, he noticed that his arm and chest muscles were substantially larger. Explain the structural and functional basis of these changes.

2. When a suicide victim was found, the coroner was unable to remove the drug vial clutched in his hand. Explain the reasons for this. If the victim had been discovered three days later, would the coroner have had the same difficulty? Explain.

3. Muscle-relaxing drugs are administered to a patient during major surgery. Which of the two chemicals described next would be a good skeletal muscle relaxantand why?
-Chemical A binds to and blocks ACh receptors of muscle cells
-Chemical B floods the muscle cells' cytoplasm with Ca(2+)

4. Michael is answering a series of questions dealing with skeletal muscle cell excitation and contraction. In response to "What protein changes shape with Ca(2+) binds to it?" he writes "tropomyosin." What should he have responded and what is the result of that calcium ion bonding?