Can Erectile Dysfunction Drugs Like Viagra Be Addictive?

Vasectomy Proceedure

This animation shows a vasectomy procedure. A vasectomy is a procedure to cause permanently sterility in a man by preventing the transport of sperm out of the testes. A small incision is made in the scrotum and each vas deferens is tied off and cut apart preventing sperm from being released within the ejaculate. The small skin incision is stitched closed and the surgery does not affect a man's sexual function.

• Men's Health

Biceps curl with dumbbell

The biceps curl with dumbbell builds strength in the upper arm. See how it's done.

HIV Animation

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

Prednisone: Overview of Uses

A review of prednisone and its use in inflammatory conditions.

• Prednisone
• Allergy
• Asthma
• Psoriasis

Hearing and the Cochlea

This animation shows the various structures of the ear and the process of hearing.

• Hearing