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B6. Respiration (Aerobic and anaerobic respiration (Uses of energy from…
B6. Respiration
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Gas exchange
The lungs
Direction of gas travel
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- Trachea (main tube towards lungs)
- Bronchi (two main split tubes)
- Bronchioles (smaller tubes)
- Alveoli (on end of bronchioles)
Sticky mucus lines mouth/throat, catches bacteria
Cilia, little hairs, push away bacteria to be coughed/sneezed out
Inhaling
Lungs increase in volume, lowers pressure inside
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Exhaling
Lungs decrease in volume, increase pressure outside
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Definition of respiration: The chemical reactions that break down nutrient molecules in living cells to release energy