passive transport Flashcards

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1
Q

factors affecting diffusion across a membrane

A

membrane thickness
surface area
temperature
concentration difference/gradient

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2
Q

define simple diffusion

A

diffusion where there is no barrier/membrane

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3
Q

factors affecting simple diffusion

A

temperature
concentration difference / gradient

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4
Q

how does diffusion across a membrane work?

A

particles passing through a phospholipid bilayer
can only happen if membrane is permeable
hydrophobic interior of membrane repels charged substances so they can’t pass through

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5
Q

define partially permeable

A

membranes that allow some molecules through

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6
Q

how is alveoli adapted to increase the rate of diffusion

A

a massive surface area
a one cell thick lining –> short diffusion pathway
a very good blood supply –> concentration gradient

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7
Q

how is villi adapted to increase the rate of diffusion

A

tiny, finger-shaped structure –> increase the surface area of small intestine
wall is one cell thick –> short diffusion distance and active transport
network of blood capillaries –> transport glucose and amino acids away from the small intestine in the blood
lacteal –> transports fatty acids and glycerol away from the small intestine in the lymph

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8
Q
A
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