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Gaseous Exchange - Coggle Diagram
Gaseous Exchange
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In Plants
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Afternoon = rate of photosynthesis more than
rate of respiration
∴ net diffusion of CO2 into + O2 out of leaves
Night = no photosynthesis, ONLY respiration
∴ net movement O2 into + CO2 out of leaves
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ADAPTIONS
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close PROXIMITY of spongy +
palisade mesophyll cells - gases
involves in P+R easily diffuse
between cells
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In Mammals
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ADAPTIONS
DENSE network of capillaries - helps
maintain diffusion gradient as constant
flow air rich O2 into and rich CO2 away from
THIN squamous epithelial
alveoli + endothelial capillaries
sit tight against each other -
short DIFFUSION pathway
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NUMEROUS, SPHERICAL
alveoli - large SA
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SURFACTANT secreted from
surfactant-secreting cells - reduces
surface tension in fluid + without it
alveoli collapse reducing SA