The respiratory system gathers and provides oxygen to the body through the mouth, lungs and blood vessels. The lungs do not contain muscles to facilitate contractions; instead, the human body is equipped with a diaphragm. The diaphragm pulls air into the lungs by expanding the chest cavity and causes the lungs to exhale by creating a smaller space in the chest cavity. The respiratory system can be represented with several interactive models that can be used by kids to understand how it all works.
- Skill level:
- Moderately Easy
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Things you need
- 567gr bottle
- 2-liter bottle
- Coloured water
- Two balloons
Fill a 591ml. bottle with coloured water.
Place a straw in the bottle and seal the top with clay.
Squeeze the bottle and let the coloured water rush out of the straw. This demonstrates an exhale. Let the bottle reform and take air in. This will demonstrate an inhale. Tell your kids that the bottle is a representation of your chest cavity.
Inhale and Exhale Visual Representation
Empty a 2-liter bottle and cut it in half at its middle using scissors.
Cut a balloon in half at its middle and stretch it over the hole in the bottom of the 2-liter bottle. Secure the balloon in place with tape.
Remove the cap on the 2-liter bottle and place a balloon inside the lid, with the opening of the balloon stretched back over the lip of the lid.
Grasp the centre of the balloon at the bottom and pull slowly away. This will cause negative pressure in the 2-liter bottle and inflate the balloon at the top. This demonstrates the role of the diaphragm, represented by the balloon stretched over the bottom. When released, the balloon at the top of the bottle, representing the lungs, will deflate.
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