Across
- 3. The type of blood which contains high concentrations of oxygen.
- 6. The system of the human body which involves the heart, blood vessels and transport of blood.
- 8. The colour of blood cell which transports oxygen around the body.
- 9. The bottom chamber of the heart.
- 10. Mammals, such as humans, are said to have a _ _ _ _ _ _ circulatory system.
Down
- 1. The system of the human body which involves the stomach and intestines.
- 2. The type of blood which contains low concentrations of oxygen (and high carbon dioxide concentrations).
- 4. The top chambers of the heart.
- 5. The number of different types of blood vessels found in the human body.
- 7. The system of the human body which involves gas exchange and the lungs.
- 8. The surface area to volume _ _ _ _ _ helps us to compare an organism's surface area to its volume.