What does the heart do? How does it do that? Make your own working model!
What does the heart do and why is it so important?
Does a heart actually look like the drawings in books or the models?
How do our choices affect the heart and how can we help the heart do its job?
Where does the blood go when it leaves the heart? Where does it come from when it returns? How does it all fit together?
What happens when the heart squeezes and relaxes?
What makes blood red? What else does blood do?
What can go wrong with the heart and why does it happen?
Where does the blood go when it leaves the heart? Where does it come back from?