BREATHING
DIAPHRAGM · RIBS · LUNGS
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Breathing In & Out
diaphragm
phase
lung volume
15 / min
breathing rate
1. Inhale vs Exhale
Inhale
Exhale
Diaphragm
contracts, flat
relaxes, dome
Ribs
up and out
down and in
Chest volume
increases
decreases
Air pressure
decreases → air in
increases → air out
2. Air In vs Air Out
inhaled
exhaled
Oxygen
21 %
16 %
Carbon dioxide
0.04 %
4 %
3. Remember
Air moves from high pressure to low pressure
Gas exchange happens in the alveoli
MATRIC BIOLOGY · GASEOUS EXCHANGE · PUNJAB BOARDS
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