1					2
3											4				5
	6													7						8
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						10
11		12
						13											14
		15
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	17											18
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												20			21
			22		23				24
																	25	26
															27
			28
											29
		30
											31

Across 3. one of two lower chambers of the heart 4. lymph node located above the shoulder blade 6. three flaps, located between the right atrium and right ventricle 7. lower border of the heart 9. the only vein that carries oxygenated blood 11. upper boarder of the heart 13. a node, a "bridge" between the SA node and the AV bundle 15. lines the chambers of the heart and covers valves 16. right ventricle pumps blood to this organ 17. lymph node located behind the thigh 18. vein used to palpate for a pulse in dogs and cats 21. located in the mediastinum; functions in the immune system 23. a node, AKA the pacemaker of the heart 25. largest structure of the lymphatic system 28. lymph node located in the 'armpit' 29. relaxation of the ventricles 30. tonsil located at the back of the throat 31. layer covering the surface of the heart

Down 1. one of two upper chambers of the heart 2. half moon shaped, prevents backflow of blood into the ventricle 4. type of circulation which circuits through the abdominal digestive organs 5. small blood vessels 8. tough, fibrous external layer 10. removal and destruction of microorganisms 12. vein located on the medial thigh, can be used for blood collection in cats 14. arteries that supply the left side of the heart 19. carry deoxygenated blood back to the heart from the body 20. two flaps, located between the left atrium and the left ventricle 22. largest artery in the body 24. carry oxygenated blood from the heart to the entire body 26. layer that lines the epicardium 27. contraction of the ventricles