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Meningitis is an infection of the membranes that surround the brain and spinal cord. Both viruses and bacteria cause meningitis. Bacterial meningitis can be life-threatening; viral meningitis seldom is. Learn more about bacterial meningitis through this quiz.

Answer this one: A woman is considered to have begun menopause after she has missed how many menstrual cycles?

Computed tomography is an imaging test that uses X-rays and a computer to make detailed images of the body. A CT scan shows details of the bones, muscles, fat, and organs.

Fluoroscopy is a type of imaging tool. It looks at moving body structures. It’s much like an X-ray "movie."

The Holter monitor is a type of electrocardiogram (ECG) used to record an ECG tracing of the heart continuously for 24 hours or longer.

Myocardial perfusion is an imaging test. It's also called a nuclear stress test. It is done to show how well blood flows through the heart muscle. It also shows how well the heart muscle is pumping. For example, after a heart attack, it may be done to find areas of damaged heart muscle. This test may be done during rest and while you exercise.

A resting RNA is a type of nuclear medicine test. A tiny amount of radioactive tracer is used during the scan. This test helps evaluate how well the heart pumps and how much blood is pumped with each heartbeat.

A resting and exercise radionuclide angiogram (RNA) is a type of nuclear medicine test. A tiny amount of radioactive substance is used to help show the heart's chambers in motion. This test can show how well the heart pumps with each heartbeat and how much blood is pumped with each heartbeat, during exercise and at rest.

Valvuloplasty is a procedure done to repair a stiff heart valve. It's done using a catheter and small incisions.