Human blood is not blue; it is always red. While blood may appear blue as people look at their veins, this is due to the way body tissue and blood absorb light.Know More
Human blood is responsible for carrying oxygen from the lungs through the body. Oxygen dissolves and binds to red blood cells. The cells get their red color from tiny quantities of iron, which turns red when it combines with oxygen. As such, oxygenated blood is bright red and becomes darker red when oxygen levels are low.
The myth of the nobility having blue blood, or "sangre azul," may have started with the visible veins of Spanish aristocrats with fair complexions. Veins consist of bluish connective tissue, so when they are combined with a layer of skin cells and pigment, the eyes perceive the blood flowing through them as blue.Learn more about Blood
The American Red Cross reports that an adult human has about 10 pints of blood in his body, which converts to about 5 quarts. When a person donates blood, he typically only provides 1 pint per donation.Full Answer >
Blood viscosity is in no way affected by the heat or cold of the surrounding environment, so blood does not thin in hot weather. Experiences of extreme temperatures differ from the effect they have on the blood and other internal anatomical elements of the human makeup.Full Answer >
The average adult human carries roughly five liters of blood. This number fluctuates depending on height, weight and muscle mass.Full Answer >
An average adult that weighs approximately 150 pounds will have about 186 ounces of total blood volume. Children that are about 80 pounds will have about 93 ounces, or half the amount of an adult.The amount of blood that the human body contains is about 7 percent of its weight.Full Answer >