1								2	3														4
					5																				6						7
	8															9
																		10												11
			12		13																	14			15
															16
										17															18
		19
																													20
										21			22														23
																								24
	25				26
												27
			28				29
									30								31
					32														33			34
											35														36
37																													38		39
																		40
	41
																42					43			44
					45							46
										47				48
																										49
										50
			51																					52
							53														54
									55

Across 2. What gas is variable in the atmosphere? 6. (aq) means 8. the first part of the small intestine 11. the thermal energy of an object depends on its __________ and temperature 13. pure substances made up of two or more different types of atom(different elements) that are chemically combined 15. This ventricle contracts and forces blood to the lungs is on the _______ hand side of the heart 16. This occurs when oxygen and carbon dioxide move between alveoli and the blood 18. carries oxygenated blood from the heart to the body 19. iron + oxygen --> 21. energy and waste products are produced in this process 24. the smallest particle of an element that can exist. 26. found between the between the 2 pleural membranes 27. a law that says the mass of the reactants is the same as the mass of the products in a chemical reaction 31. Pb(NO3)2 32. carries oxygenated blood back to the heart 34. cells respire to produce ______________ 35. The body’s main source of energy 37. temperature that a solid turns into a liquid 39. Which has more thermal energy:A - 50g of water at 40oC or B -100g of water at 40oC 40. the gases that surround a planet or moon 41. two tubes which carry air to the lungs. 44. 2 or more substances that are not chemically combined. no bonds between each substance therefore they can be separated by physical methods (e.g. filtration, freezing, distillation) 48. This chamber contracts and pumps blood to the body under high pressure 50. what all substances are made up of, and which contain only one type of atom. 51. These are substances formed in a chemical reaction and shown after the reaction arrow in an equation. 52. This is transported to cells for aerobic respiration 53. 2 moist slippery layers that reduce friction during breathing - the _____________ membranes 54. biological catalysts that speed up digestion 55. blood vessels that carry blood TOWARDS the heart

Down 1. opening at the end of the digestive tract that controls the expulsion of faeces 3. What gas is 0.9% of the atmosphere? 4. this organ produces enzymes for digestion 5. substances that react together, shown before the arrow in an equation 7. the intestine where digestion is completed and nutrients are absorbed into the body 9. carries deoxygenated blood back to the heart 10. the action of muscles in the ribcage and diaphragm to allow air into the lungs 12. What gas is 78% of the atmosphere? 14. a waste product of respiration, is removed from the body 17. the ribs and diaphragm move so that the pressure in the lungs _____________ to draw in breath 20. A source of energy found in butter and vegetable oils 22. carries deoxygenated blood from the heart to the lungs 23. An enzyme produced by the pancreas 25. copper + oxygen  --> 28. the movement of air in and out of the lungs 29. temperature that a liquid turns into a gas 30. small tubes in the lung at the end of the bronchi 33. wave like motion of the gut muscles to move food along the gut 36. blood vessels that carry blood AWAY from the heart 38. This and sugar are examples of carbohydrates 39. Which has more thermal energy:A - 50g of water at 40oC or B -50g of water at 60oC 42. How can you tell the reaction with copper and oxygen is finished in this experiment in terms of the volume of air? It is ____________ 43. 2 or more atoms joined together 45. small air sacs found at the end of each bronchiole where gas exchange takes place 46. this is absorbed in the large intestine leaving undigested waste material 47. blood on the return journey from the body to the heart is at lower ____________ than its “outward” journey 49. What gas is 21% of the atmosphere?