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Your heart pumps blood throughout your body in one direction, around in a loop. In this activity, learners will make a model of one type of heart chamber called a ventricle.

Bones are stiff, which helps us lift heavy things and walk around, but they are also somewhat flexible, which lets them bend slightly.

Many germs spread by our hands, and often times, people don't wash their hands well enough to get rid of germs.

Doctors often send a sample of blood to a lab, to make sure their patients are healthy.