The length of the digestive tract
string, a tape measure, scissors
Use the string to show the length of an 'unravelled' digestive tract:
- mouth cavity: ___ centimetres
- oesophagus: ___ centimetres
- stomach: ___ centimetres
- small intestine: ___ metres
- large intestine: ___ metre
First, try to estimate these amounts.
Then carry out the experiment again, this time using a tape measure.
How accurate was your estimate? Was it too low? Was it too high?