Gas exchange in single celled organsims and insects 6.2

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Why is gas exchangein single celled organisms really efficient
because they have a large surface area to volume ratio
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How does oxygen and carbon dioxide move across a cell surface membrane
diffusion
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what is the internal network of tubes called in an insect that allows for efficient gas exchange
tracheae
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what are the smaller tubes called in an insect that branch off from tracheae
tracheoles
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how do gases move in and out of an insect with a diffusion gradient
cells respire oxygen used up, meaning lower concentration carbon dioxide is produced diffusion grad is set up oxygen in carbon dioxide out
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what is mass transport
Its the contractions of muscles which squeezes air in and out
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what happens when the tracheoles are filled with water
when the muscle cells respire lactate is produced this lowers the water potential of the muscle cells this means more diffusion and it increases the rate of diffusion
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what are the tiny pores that allow gases to leave an insect
spiracles
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Card 2

Front

How does oxygen and carbon dioxide move across a cell surface membrane

Back

diffusion

Card 3

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what is the internal network of tubes called in an insect that allows for efficient gas exchange

Back

Preview of the front of card 3

Card 4

Front

what are the smaller tubes called in an insect that branch off from tracheae

Back

Preview of the front of card 4

Card 5

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how do gases move in and out of an insect with a diffusion gradient

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