Across
- 3. What is the hardest working muscle in the body?
- 5. What is the study of the human heart called?
- 7. What are the cells called that make your heart pump?
- 8. What kind of organ is the heart?
Down
- 1. Which body system is the heart a part of?
- 2. How many chambers is the heart made up of?
- 4. What is the machine called that pumps blood outside the body during heart surgery?
- 6. What is blood going towards your heart carried through?
- 9. Where do blood cells collect their oxygen?