The lymphatic system keeps our tissues from retaining fluid and houses many of the key components of the immune system, like lymph nodes. Learn how this underappreciated body system is organized and how it functions.

This video shows how the large intestine or colon is removed through laparoscopic surgery. The perspective is that of the surgeon performing the colectomy or colon resection. A note to viewers, this video shows surgery on an actual patient. The anatomical landmarks are not labeled, but described by the surgeon narrator.

The sugar (glucose and others) that we eat must have insulin in order for it to enter our tissues. This video shows what happens in diabetes mellitus when tissues are insensitive to insulin. This is the case in Type 2 diabetes.

This narrated 2D animation shows how the heart muscles contract and the chambers of the heart push blood through the circulatory system.