The rhythmical expansion and contraction of the arteries as blood is pumped through them by the beating of the heart. light year - Not a length of time but a distance, the distance a pulse of light travels in one year (about 5.88 trillion miles). pea - Comes from Greek pison, pulse, pease..
Scientists estimate the volume of blood in a human body to be approximately 7 percent of body weight. An average adult body with a weight of 150 to 180 pounds will contain approximately 4.7 to 5.5 liters (1.2 to 1.5 gallons) of blood. An average child with a body weight of 80 pounds will have approximately half the amount of blood as an adult. Blood carries out many critical functions in the body. It transports nutrients and oxygen to the body's cells.
The fluid consisting of plasma, red blood cells, white blood cells, and platelets that is circulated by the heart through the arteries and veins, carrying oxygen and nutrients to and waste materials away from all body tissues.2.lood varies in color from a bright red in the arteries to a duller red in the veins. The total quantity of blood within an individual depends upon body weight; a person weighing 70 kg (154 lb) has about 4.5 liters of blood in the body.