Movement of Substances SLOP Flashcards

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1
Q

Define the term diffusion

A

Movement of molecules from a region of high concentration to a region of lower concentration, down a concentration gradient (passive so does not need energy)

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2
Q

Define the term osmosis

A

Movement of water molecules across a partially permeable membrane, from a region of higher water concentration to a region of lower water concentration (or down a water potential gradient)

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3
Q

Define the term active transport

A

Movement of molecules/ions (e.g. glucose) against a concentration gradient, from a region of lower concentration to a region of higher concentration. Requires ATP/energy from respiration

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4
Q

State four factors that affect the rate of movement of substances into and out of cells

A

Surface area:volume ratio, temperature, distance, concentration gradient

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5
Q

When potato cylinders are placed in glucose solution, will water move into or out of the cells?

A

Out of cells by OSMOSIS

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6
Q

When animal cells are placed in water (e.g. red blood cells),

A

Into cells by osmosis; cells burst as they have no cell walls

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