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

This animation shows the immune system reacting (or overreacting) at the cellular level. It describes what happens when an allergen, like dander or pollen, enters the body. It also shows how some allergy medicines work, like anti-histamines.

The animation explains how the lungs provide oxygen to and remove carbon dioxide from the blood. The specialized anatomy of the air sac in the lung allows the gas exchange to occur efficiently, as discussed and shown in the video.

A plastic surgeon describes the anatomy of the nose and how these structures can interfere with breathing, cause sinus problems, or be less than ideal cosmetically. This video, which uses graphical animations as teaching tools, explains how the bones and cartilage of the nose contribute to common nasal defects.

The sinuses in the skull can become blocked and inflamed leading to pain and sometimes fever. The traditional surgical treatment for blocked sinuses was to use rigid instruments to enlarge the areas that drain the sinuses. A newer approach, which is shown in this animation, involves the insertion and inflation of a balloon to expand the sinus outlets. This approach is similar to balloon angioplasty used in damaged or blocked blood vessels.

This stylized animation shows what a cell might look like at very high magnification. It begins by showing the cell membrane and the proteins that hold the cell together. The video continues to describe the internal workings of a cell. While the narration is very detailed and accurate, this video may use terminology that is advanced for a general audience.

This narrated animation explains how normal cells sometimes change and turn into cancer cells. It touches on some of the causes and the prevalence of cancer and cancer deaths in the population.

This animation provides a very brief overview of body anatomy, from the entire body down to subcellular organelles.

The animated video, narrated by a physician, describes the two main types of stroke: ischemic and hemorrhagic stroke. Ischemic strokes are further subdivided into thrombotic strokes and embolic strokes while hemorrhagic strokes are classified into subarachnoid hemorrhage and intracerebral hemorrhage. The location of the stroke in the brain directly influences the kind and degree of neurological deficit, which is discussed.