Question

At a resting pulse rate of 79 beats per minute, the human heart typically pumps about 67 mL of blood per beat. Blood has a denstity of 1060 kg / m3. Circulating all of the blood in the body through the heart takes about 1 min for a person at rest. (a) How much blood is in the body? Give answer in cubic meter(m3) (b) On average, what mass of blood does the heart pump with each heart beat? Give answer in kilograms (kg).
Hint:
1000mL=1L
1000L=1m^3(cubic meter)

Answer 1

For about 1 minute = 79 beats

1 beat = 67mL =  (67/1000) liters = 0.067 liters

1000L = 1m³,  1L = 10^-3 m³

0.067 liters =  (0.067 * 10^-3)  m³
 
79 beats =  79 *0.067 * 10^-3  =  5.293 * 10^-3 m³

Mass  =  Density * Volume

Mass =  1060 kg/m³ * 5.293 * 10^-3 m³ = 5.61058 kg

Heart pumps 5.61058 kg of blood.