As the title implies, this video describes how muscles work. It shows the anatomy of the muscle in relation to bone but also the structure of muscle at the microscopic level.

Dental implants have revolutionized the way that dentists replace teeth, but they do require healthy jaw bone in which to anchor. Unfortunately tooth loss causes bone to resorb (atrophy or deteriorate). This video describes the process by which new bone if grafted into the jaw so that dental implants can be installed.