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

VOA: special.2009.10.20

There, researchers are developing a test that uses human saliva instead of blood to find those infected with malaria.

VOA: special.2010.04.20

Doctors operated on him later that year to try to improve the flow of blood from his heart.

VOA: special.2010.02.07

Another study found that aspirin blocks the formation of blood vessels that feed cancer growth.

VOA: special.2009.10.20

The first involves sheep. Researchers have found that hair sheep are a good source of blood for use in tests to diagnose infectious diseases in people.

VOA: special.2009.08.03

A stroke is a loss of blood flow in the brain.

VOA: special.2009.09.22

And,it increases the flow of blood and oxygen in the body.

VOA: special.2010.06.08

The test uses saliva instead of blood to confirm the infection.

VOA: special.2009.12.22

And a pool of blood flowed from the horribly torn throat.

VOA: special.2011.02.26

The test uses saliva instead of blood to diagnose the infection.

VOA: special.2009.12.07

He was weak from the loss of blood.

VOA: special.2009.07.02

Other protests during the week have included the pouring of blood on key goverment administrative buildings in ritual ceremonies.

VOA: standard.2010.03.20

"I think it's very important to bring to people's attention that the issue of blood diamonds is a very important one;

VOA: standard.2010.08.05

Dr.Walter Mwanda is head of blood transfusion services at Kenyatta National Hospital, Kenya's largest public health care facility.

VOA: standard.2010.06.04