Ending the Circulatory System

Last week we completed our unit on the circulatory system. We made a model heart using our Scholastic Easy Make & Learn Human Body book (found it free here!!)

We used blue yarn to represent the path of blood with no oxygen. Then we used pink (we had no red yarn) to represent the path of blood with oxygen.

We also worked on a lab as well. The kids colored in their lab sheet, showing what a drop of blood looks like under a microscope.

Then we made a blood sample using lemon juice (plasma), red hot candies (red blood cells), dry lentils (platelets) and dry lima beans (white blood cells).

 We discussed the 4 parts of blood and learned that not all of the parts are red.

We added everything into the jar, saving the red hots for last. Once we added in the candy, the "blood" sample began to turn red. The children came to the conclusion that red blood cells make blood red.