Experiment No. 15
Question: How hard does the heart work?
Experiments: To examine how hard the heart works.
You will need:
A plastic container that holds about 150ml,
With a friend to time you, use a beaker to try to bale water
from one bowl to another, at 70 beakerfuls per minute.
Can you do it?:
If you can, how long can you keep bailing water
at this rate? Your arm muscles soon get tired!
Find out more!
When you are at rest, each heart-beat sends about 150ml (1/3 pint) of blood into the arteries. In an average adult, this happens between 60 and 80 times each minute.
The heart is made from a special muscle called cardiac muscle.
It keeps pumping for an entire lifetime without getting tired!
Sixth Class Experiments