What is the answer?

Question

at a resting pulse rate of 81 beats per minute, the human heart typically pumps about 73 mL of blood  per beat. Blood has 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?

b. On average, what mass of blood does the heart pump with each heart beat?

Answer 1

Bagus this is your lucky day!   Use dimensional analysis:

 

81 beats/min * .073 liters/beat  = ?? liters/min

 

?? liters/min * 1 min/body = ?? liters/body

 

.073 liters/beat * 1 m^3/1000 liters * 1060 kg/m^3 = !! kg/beat