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.

This video describes how the circulatory system works, how disease can affect blood vessels (atherosclerosis), and how doctors use angiography to test for coronary artery blockage.

This video contains actual footage of an appendectomy. The procedure is being performed laparoscopically and shows what the surgeon sees through the small camera inserted into the body. This video may be difficult for some viewers since it shows surgery on actual human tissue.

This narrated 3D animation shows how a glaucoma surgery is performed, specifically a trabeculectomy. While the video is incredibly detailed and thorough, it does contain anatomical, surgical, and medical terms throughout. Glaucoma is a disease in which too much fluid and, by extension, pressure builds up inside the eye. A trabeculectomy is one type of glaucoma surgery that improves fluid outflow from the eye and reduces intraocular (inside the eye) pressure.