The female mosquito uses its thin sucking tube to break the skin, find blood and inject the victim with a substance that keeps blood flowing.

VOA: special.2009.05.26

It thickens the blood around a cut to stop bleeding.

VOA: special.2010.09.14

Baghdad TV showed pools of blood and chunks of cinderblock from the explosion of a bomb in the Kurdish village of Sinjar,near Mosul.

VOA: standard.2009.08.29

That means they take a drop of blood and they look at it under a microscope, and they can confirm that this was an actual case of malaria.

VOA: standard.2010.06.17

There are two kinds of strokes. An ischemic stroke happens when a blood vessel in the brain gets blocked.

VOA: special.2009.09.22

"First off,there is the infectious disease risk because if you use human blood there's a lot of transmissible diseases.

VOA: special.2009.08.03

There is a risk that giving a patient a strong blood thinner during a stroke can cause bleeding inside the brain.

VOA: special.2009.09.22

For example, a murderer might have blood or dirt on his or her hands which leaves prints on the wall.

VOA: special.2010.05.05

Last Friday he suffered a torn aorta, a large artery that carries blood from the heart to the body.

VOA: special.2010.12.18

Clots can block the flow of blood to the heart or brain and cause a heart attack or stroke.

VOA: special.2009.10.20

The World Health Organization says passengers who sit still for four or more hours face a greater risk of developing blood clots.

VOA: special.2009.07.14

They may have a weak or damaged heart, high blood pressure or other problems of the blood system.

VOA: special.2010.07.27

He is a high blood pressure expert and professor at Albert Einstein College of Medicine in New York.

VOA: special.2010.03.03

But blood drops with long tails can tell a great deal about the direction, speed and angle of the blood's starting point.

VOA: special.2010.05.05