going for gold 2

2. this is the name of the lower, larger chambers of the heart
3. this is the smooth material between bones, that helps to cushion the bones
6. this gas enters the blood to be used in respiration
10. this word describes how gases move, or how the smell of perfume would spread around a room
12. these 'air sacs' give the lungs a large surface area
15. the fluid in the joints helps to smooth the action of the joint because it acts as this type of substance
17. water and this other substance are the products of aerobic respiration
18. these tissues connect muscle to bones

1. this side of the heart is thicker as it pumps blood all around the body
4. this is the term for an upper chamber of the heart
5. this term describes how muscles work in the opposite way to each other
7. this dome shaped muscle at the bottom of the lungs flattens when we breathe in
8. this type of respiration does not need oxygen
9. these tissues connect bones to bones
11. this is the number of chambers in the heart
13. these structures in the heart stop the blood form flowing back
14. this is the addictive chemical in cigarettes
16. this is the name for the windpipe, which is kept open by cartilage
17. the tar in cigarettes can cause this disease in the lungs