Next up in our series about the human body, we investigated the digestive system. This didn't involve the most visually impressive set of activities and experiments but they were very effective at showing the girls the steps involved. We started out sitting down with a biscuit to eat. As the girls bit into and chewed their biscuit I asked them to think about how they ate it, what was happening to the biscuit and which parts of their mouth were involved. They were quick to identify that teeth crunched up food and their tongue pushed it around the mouth. We simulated this with a dry cracker in a ziploc bag to snap and crush as the teeth do. As the girls worked on 'chewing' the cracker, I asked a few questions to lead them to think about how the food changed from dry and crumbly to wet and mushy in their mouth and how that made it easier to swallow. This is their saliva glands working.science matters website). The girls made rings with their fingers and contracted them above the plastic egg, pushing it down the leg of the tights.
cardiovascular system, they linked it to the small intestine and asked if that was how the nutrients were picked up - I was pleased they were linking previous knowledge to this session. It takes around four hours from when food is eaten to it being absorbed and used by the body. The final part of the journey is the large intestine where the last of the nutrients and much of the water is reabsorbed.