Blood is a body fluid in the circulatory system of humans and other vertebrates that delivers necessary substances such as nutrients and oxygen to the cells, and transports metabolic …

Blood is composed of 55% plasma and 45% “formed elements,” including red blood cells, white blood cells, and platelets. Because of these living cells suspended in the plasma, blood is …

2 days ago · A red blood cell count measures the number of red blood cells that carry oxygen in your blood. Low red blood cell counts can indicate anemia, which often causes fatigue and …

Blood picks up oxygen from the lungs and nutrients from the gastrointestinal tract and carries them to cells throughout the body for metabolism. It picks up carbon dioxide and other wastes …

Register to be a blood donor, give blood and save lives. Find out more about blood donation.

Blood is the fluid of health, transporting disease-fighting substances to the tissue and waste to the kidneys. Because it contains living cells, blood is alive.

Blood consists of a pale yellow or gray-yellow fluid, plasma, in which are suspended red blood cells (erythrocytes), white blood cells (leukocytes), and platelets.

Four basic components — each with its own role — make up blood: red blood cells, white blood cells, platelets, and plasma. Red blood cells account for nearly all of the 45 percent of blood …

The body contains about 5 to 6 quarts (about 5 liters) of blood. Blood performs various essential functions as it circulates through the body: Once blood is pumped out of the heart, it takes 20 …

American Red Cross has blood drives and blood donation centers across the United States. Search for a blood donation location near you.