heart pumps blood to the rest of the body & blood is a vehicle for carrying oxygen from the lungs to the rest of the body ->  the heart pumping blood transports oxygen to the rest of the body  the heart pumping blood transports oxygen to the rest of the body & if something is transported to something else then that something else receives that something ->  the heart pumping blood causes the rest of the body to recive oxygen  the heart pumping blood causes the rest of the body to recive oxygen & as the rate of a heart beating increases , the rate of the blood traveling to the rest of the body will increase ->  as the rate of heart beating increases, the amount of oxygen being recived by the rest of the body increases  muscle cells are a part of muscles & muscels are a part of the body ->  muscle cells are a part of the body  as the rate of heart beating increases, the amount of oxygen being recived by the rest of the body increases & muscle cells are a part of the body -> as the rate of heart beating increases, the amount of oxygen being recived by muscle cells increases