alveoli 16
aorta 19
arteries 8, 19
beating 5, 13, 14, 15, 16
blood 5, 7, 8, 11, 13, 15, 16,
19, 20
blood vessels 8
breathing 4, 16
capillaries 8, 19
carbon dioxide 7, 15, 16
cells 7, 15, 19
chambers 11
force 13
heart 4, 5, 8, 10, 11, 13, 14,
16, 19, 20
lungs 8, 10, 16, 20
muscle 13
nutrients 7, 20
organ 5
oxygen 7, 8, 14, 15, 16, 19, 20
pumping 5, 14, 20
relaxing 13, 15
squeezing 13, 16
valves 11
veins 8, 20
waste 7, 19, 20
INDEX
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