Structure of the Heart

3. The muscular wall that separates the ventricles in a four chambered heart
4. The side of the heart that pumps oxygenated blood from the lungs to the body
6. The muscular organ of the circulatory system which contracts to pump blood around the body
8. The chamber of the heart that receives blood from the body
9. Tubes of the circulatory system through which blood travels
10. The blood vessel that carries blood from the lungs to the heart
13. Part of the circulatory system that carries oxygen, glucose and cell waste
15. The blood vessel that carries blood from the heart to the lungs
16. The blood vessel that carries blood from the lower body to the heart
19. The type of animal that has a two chambered heart
20. The chamber of the heart that receives blood from the lungs
23. The chamber of the heart that pumps blood to the body
24. A general name for a blood vessel which carries blood TOWARDS the heart
25. The term that describes blood that has a high concentration of oxygen
27. A general name for a blood vessel which carries blood AWAY from the heart

1. A tiny blood vessel where diffusion can occur
2. The term for the chambers of the heart that PUMP blood
5. Number of chambers of the hearts of reptiles and amphibians
7. The chamber of the heart that pumps blood to the lungs
11. Number of chambers of a human heart
12. The blood vessel that carries blood from the upper body to the heart
13. Mammals and ________ have four chambered hearts
14. The term that describes blood that has a low concentration of oxygen
17. The blood vessel that carries blood from the heart to the body
18. The side of the heart that pumps deoxygenated blood from the body to the lungs
21. The term for the chambers of the heart that RECEIVE blood
22. In three chambered hearts, oxygenated and deoxygenated blood _____ in the ventricle
26. Flaps in the heart that prevent the back flow of blood through the heart