What is the difference between active transport and facilitated diffusion
although they both use a carrier to transport the molecules ATP is used in active transport. When the ATP is hydrolysed it releases energy which is used to move the molecule against the conc gradient.
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What is regular diffusion
Passive movement of small, non polar lipd soluble molecules from an area of high conc to an area of low
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What types of molecules get transported in facilitated diffusion
Polar , charged, water soluble or molecules that are too large to fit through porous membrane.
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define osmosis
the movement of water molecules across a partially permabl mebrane from an area of low solute conc to and area of high solute conc.,
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Define active transport
Transport of molecules across a carrier protien from low to high conc with the use of energy obtained by ATP when it is hydrolysed.
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What is the difference between endocytosis and exocytosis
Both are a type of bulk transport but the subtances are transported out of the cell when the vesicle fuses with the cell mebrane during exocytosis whereas the membrane engulfs the material to be transported when it fuses with the CM into the cell.
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What is the ficks law equation
Rate of diffusion is directly proportional to the sa X the conc difference divided by the distance
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What does the ficks law eqaution determine
the rate of diffusion, stating that the larger the SA, difference in conc and the shorter the diffusion pathway the quicker the diffusion rate
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Name 3 ways in which the mammalian lungs are adapted for rapid gas exchange
1. large SA due to presence of many alveoli 2. good supply of circulating blood carrying co2 to lungs and o2 away ensuring that the conc gradient is steep maintained by breathing 3. the alveoli are only one cell thick thus a small diffusion pathway.
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What 3 things change when gas exchange increases and how
SA increases, diffusion distance decreases and diffusion gradient becomes more steep.
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Other cards in this set
Card 2
Front
What is regular diffusion
Back
Passive movement of small, non polar lipd soluble molecules from an area of high conc to an area of low
Card 3
Front
What types of molecules get transported in facilitated diffusion
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