Instructions: Pour one gallon of water from a milk jug into one dishpan for the group and discuss this is how much blood their heart pumps in one minute. See if students can move 1 gallon of water in 1 minute with a 1/4 cup.
Discussion: there is about 1.2 – 1.5 gallons of blood in an adult – about 7% of their total weight. The human heart moves about 1/4 cup of blood through the body with each beat. The heart beats about 72 times in one minute. This means that in one minute the heart will move a little more than 1 gallon of blood.
How to do the math:
What surprised you the most about this demonstration game?
if the heart pumps 1 gallon in one minute, how many gallons are pumped in 1 hour? In one day? In one year?
1 gallon x 60 min/h = 60 gallons in an hour
60 gal/hour x 24 h/day = 86,400 gallons a day
86,400 gal/day x 365 days/year = 31,536,000 gallons in a year
Download this activity here.