I teach 1st grade and I was told yesterday that I have to present a lesson. My lesson is going to be on the primary function of organs (stomach, skin, brain, etc). I am going to have the kids put into 4 groups and each group will get 2 organs. At their tables they are going to have different items and they will have to decide as a group which item could represent the organ they were given and they will have to come to the front of the room to present their organ, item, and explain how it could carry out the function of the organ. For example, they would have a straw and they could say that it cold represent the intestines because waste could flow through it. Anyways, I am having trouble coming up with items for bones, heart, and stomach. Any ideas? Here are the items that I was thinking about for the other organs- intestines- straws muscles- rubber bands lungs- balloons skin- plastic wrap brain- sponge stomach- ? heart- ? bones- ? Any suggestions are appreciated!!!