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1. Definition and Factors
Affecting Gas Exchange
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2. Definition of Gas Exchange
 Gas exchange is the biological process through
which different gases move.
 They move across respiratory surfaces to
different parts of the body of a living organism.
 It occurs through diffusion when gases move
from areas of high concentration to those of low
concentration.
 Gas exchange is essential for facilitating different
cellular, respiratory and metabolic activities in
the body.
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3. How gas exchange occurs in
different organisms
 Different gases must dissolve in body fluids
first .
 They are then transported across the
membranes and being diffused to surfaces of
lower air concentration.
 Therefore gaseous exchange can only take
place in moist environments.
 Exchange systems must have the required
fluid too.
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4. Singular Celled Organisms
 They have the fastest gaseous exchange rate.
 This is because air only travels through the
cell membrane.
 It reduces the distance through which gas
exchange has to occur.
 It also increases surface area hence improving
blood circulation.
 There are four main factors that affect gas
exchange in both animals and plants.
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5. Surface Area Of The
Membrane
 The larger the surface area of the membrane
the higher the rate of gas exchange that
takes place.
 There is a directly proportional relationship
between surface area and gas exchange .
 This is because when the surface area is large
more blood and air are able to circulate hence
increasing the rate of gas exchange.
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6. Concentration Gradient
 Concentration gradient is only possible when
a membrane separates two surface areas with
different concentration of gases.
 The difference is what actually facilitates the
process of gas exchange.
 This is because the gases are able to move
from areas of high concentration to those of
lower concentration.
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7. Thickness of the membrane
 The rate of gaseous exchange process is also
affected by the thickness of the membrane.
 This is through which the gases have to
diffuse.
 A thicker membrane reduces the rate at
which gases diffuse.
 This is from areas of higher concentration to
those of lower concentration.
 This is an inversely proportional relationship
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8. The Distance of Diffusion
 It is the distance across which air and blood or
plasma fluids have to travel to diffuse.
 In singular celled organisms gaseous exchange
tends to be faster.
 This is because the gases only have to diffuse
through one cell membrane.
 Complex creatures gas exchange requires
complex transportation and respiratory system.
 This is because the gases are transported
through a longer distance.
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9. Get More Information on
Definition and Factors
Affecting Gas Exchange
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10. Get More Information on
Definition and Factors
Affecting Gas Exchange
At:
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