Science Club – Hearts

Circulatory System

Arrival Craft: Draw red and blue lines onto a body shape to model the circulatory system.


Demonstration: What is blood like? Can you name any of the types of blood cells in the body? Our blood is mostly made of red blood cells, there’s about one white blood cell (about twice as big) to every 700 red, and about one platelet (about one fifth the size) for every 10-20 red blood cell. The whole lot is suspended in plasma (about 55% plasma, 45% cells).

Do you know what makes blood move around your body? All the blood in your body is pumped around by one muscle, do you know which muscle that is?

Listen to someone’s heart using a stethoscope, show the children how to find their pulse.

Show model of a heart and talk about the four chambers.

Warning: children who want to skip the dissection should go and colour now.

Show pre-dissected heart and talk about what we can see.

Individual Task:

Children can cut open their hearts, see if they can trace the path that the blood takes.

Try to find the atriums, the ventricles and the valves.


Active Science: get adults to play lungs, heart and rest of the body; the children will be red blood cells, they carry oxygen from lungs, via heart, to body, then carbon dioxide via heart to lungs.


Break for drink and snack, put hearts on the gingerbread men, read I know about Cells.

I wanted to introduce the idea of CPR, and my boys wanted a play. So I wrote a short play for them to put on.
The parts are very uneven, as Baby is much younger than the others!
DR ABC play.


Any children who would like to, take a turn practising CPR on the MiniAnne.
Mini Anne is a wonderfully affordable CPR dummy. You should probably learn CPR separately as the instructional DVD that comes with the dummy is really only about dummy maintenance, and wouldn’t be adequate for anyone unfamiliar with CPR procedures. It is great for practice, though!


Optional Extension:

Take your pulse, then run around for five minutes, take your pulse again, then sit and colour or read quietly for five minutes, and take your pulse again.

Gather together: Work out the averages of our ‘at rest’ pulses, our ‘after running’ pulses and our ‘recovery’ pulses.


What did you notice about the rate of your pulse during the experiment?


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