Science KS2: How our circulatory system keeps us alive

This short film explains how the heart and circulatory system work, taking a close look at the four chambers, two sides, and the valves of the heart.

They also show the system of veins and arteries throughout our body, and how our blood carries oxygen from our lungs.

Zoe asks a group of children to perform a heart rate experiment, taking their own pulses.

They record their resting heart rate, their heart rate after exercise and how quickly it slows down over the next few minutes, with Zoe making a graph to plot the results.

She explains how returning to a normal heart rate quickly indicates fitness, and the importance of exercise to stay healthy.

This short film is from the BBC series, Amazing Me.

Teacher Notes

You could recreate the blood cycle / circulation by using red balloons and blue balloons to represent oxygenated and deoxygenated blood.

After doing the demonstration for 1-2 minutes, plot your pupils' heart rates, to ascertain heart rates whilst the body is exerting itself.

After 1 minute measure heart rates again, and again after 3 minutes, and plot the difference within a graph.

Work out the average heart rate whilst working hard, and the average after 3 minutes and discuss what can be learnt from the exercise.

Curriculum Notes

This short film will be relevant for teaching the topic of the human body at KS2 in England, Wales and Northern Ireland and Second Level in Scotland.

More from Amazing Me

Digestion - how does breakfast affect your day?
How do muscles and bones work?
Respiration - how is oxygen transported round the body?
Teeth - how they help animals eat
How the human body grows
What causes us to burp and break wind?