When Eric returned from jogging, he was breathing heavily an…

When Eric returned from jogging, he was breathing heavily and sweating profusely, and he complained that his legs ached and felt weak. On the basis of what respond to the following questions: Why is Eric breathing heavily? What ATP-harvesting pathway have his working muscles been using that leads to such a breathing pattern? What metabolic product(s) might account for his sore muscles and his feeling of muscle weakness?

Deborah, a 75-year-old woman, stumbled slightly while walkin…

Deborah, a 75-year-old woman, stumbled slightly while walking, then felt a terrible pain in her left hip. At the hospital, X-ray images revealed that the hip was broken.  Also, the compact bone and spongy bone throughout her spine were very thin.  What was her probable condition?