Biology

Lungs- Breathing mechanism, diseases , lung function

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inspiration-(breathing in)
diaphragm contracts, intercostal muscles contract, ribcage moves upwards and out, volume increases and pressure decreases air is taken in
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Expiration-(breathing out)
intercostal muscles and diaphragm relax, ribcage moves downward and inwards diphragm returns to dome shape, volume of thorax decreases pressure increases, air moves out. no energy required passive process
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gas exchange in alveoli
many alveoli craete large surface are for diffusion of O2 + CO2, surrounded by blood capillaries, O2 diffuses out of alveolus into blood CO2 diffuses into alveoli from blood and breathed out
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Adaptation of Alveoli
epithelium one cell thick (short diffusion pathway), Large surface area because of large number of alveoli (allows efficient gas exchange)
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calculating PULMONARY VENTILATION
PULMONARY VENTILITION= Tidal volume x Ventilation rate
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Other cards in this set

Card 2

Front

intercostal muscles and diaphragm relax, ribcage moves downward and inwards diphragm returns to dome shape, volume of thorax decreases pressure increases, air moves out. no energy required passive process

Back

Expiration-(breathing out)

Card 3

Front

many alveoli craete large surface are for diffusion of O2 + CO2, surrounded by blood capillaries, O2 diffuses out of alveolus into blood CO2 diffuses into alveoli from blood and breathed out

Back

Preview of the back of card 3

Card 4

Front

epithelium one cell thick (short diffusion pathway), Large surface area because of large number of alveoli (allows efficient gas exchange)

Back

Preview of the back of card 4

Card 5

Front

PULMONARY VENTILITION= Tidal volume x Ventilation rate

Back

Preview of the back of card 5

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