10 facts about the cisculatory system...by Katarina Zurkic
*the heart beats around 3 billion times in an average person's life.
*about 8 million blood cells die every second and the same amount are born every second.
*within a tiny droplet of blood there are some 5million red blood cells.
*it takes 20seconds for a red blood cell to circle the whole body.
*Blood that has alot of oxygen is red, blood that is poor in oxygen is white.
*the heart pumps 90-120beats per minute for children
*70 beats for adults
*the heart pumps about 4.5letres of blood every minute in adults
*when the heart is beating rapidly and fast after exerscise, it pumps up to 14literes of blood.
*the heart has four chambers