What happens during obstructive sleep apnea?

HIV Animation

This animation shows the HIV molecule, its components, and what it does inside the body to an infected person.

Cataract

This animation depicts how a cataract is seen in the eye.

• Vision

Seated row with weight machine for upper back

The seated row with weight machine targets the muscles in the upper back. See how it's done.

Reducing Radiation from Medical X-rays

Medical X-rays are an important tool for diagnosing and treating diseases, but they pose a small risk from radiation. Learn what you can do to reduce the risk in this FDA Consumer Update video.

Carotid angioplasty and stenting

Carotid angioplasty and stenting — See how this stroke treatment is done.