Membrane Transport Flashcards by Wani Ader

composed of phospholipids and proteins

cell membrane

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arrangement of phospholipids (name)

phospholipid bilayer

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cell membrane fluid/rigid

fluid

components drift past one another

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cell membrane function

retains cell contents

regulates material movement into/out of cell

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selective barrier

cell membrane

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proteins embedded in membrane

membrane proteins

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types of transport proteins

channel protein

membrane pumps

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diffusion of small molecules and ions is function of …

channel protein

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… function is active transport of particles

membrane pumps

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speed up chemical reactions

enzymes

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… function is attachment of hormones

hormone receptor site

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3 general membrane protein functions/actions

attachment of other cells
cell to cell recognition
attachment to cytoskeleton

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types of cell transport

passive

active

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passive transport

cell doesn’t spend energy

happens cuz occurs “down” transportation gradient

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active transport

cell spends energy (ATP)

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eg. materials transported into cells (nutrients)

O^2
water
iron
calcium
glucose
cortisol

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eg. waste/products transported outta cells

carbon dioxide
minerals (ions)
lactic acid

Particle Model of Matter

All matter = particles different sizes and shapes
Particles in constant random motion
Particles attract - form bonds of varying strengths
Matter = mainly empty space

Brownion motion

random motion of particles

concluded by Robert Brown

Might find other substance particles in spaces between articles (T/F)

Factors affecting rate of diffusion

agitation
temp
molecule size

solutes dissolve from low to high concentration (T/F) + why

F
high to low
due to random motion of particles

Molecules travel away from concentrated area (T/F)

selectively permeable membrane (spm)

barrier allowing only certain solutes through

solutes allowed through spm based on

size shape electrical charge lipid solubility

electrical charge def in terms of plasma membrane

membrane is polar

lipid solubility info

liver and kidneys may need to work first

diffusion of water across membrane | passive process

osmosis

water moves from high to low in osmosis (T/F)

does a high solute concentration correspond to low water concentration

yes | less room for water due to solute taking up much space

Hypertonic

higher solute concentration when compared to another solution

Hypotonic

lower solute concentration when compared to another solution

Isotonic

two solutions have same solute concentration

tonicity

whether solution hypersonic/hypotonic/isotonic

to reduce the dependence on diffusion, multicellular organisms have

developed other internal transport systems

larger cells are more likely to survive than smaller cells. (T/F)

more wastes must leave in larger cell (T/F)

more molecules must move through the membrane in larger cell (T/F)

distances from the cell membrane to various organelles greater in smaller cell (T/F)

when cell in isotonic solution, individual water molecules ...

can move back and forth across the cell membrane

small substances soluble in lipids can pass through the cell membrane by

diffusion

factor determining whether movement across cell membrane is active/passive transport

energy use