SB1i: Transporting Substances Keywords Flashcards

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1
Q

Active transport

A

The movement of particles across a cell membrane from a region of lower concentration to a region of higher concentration (against the concentration gradient). The process requires energy.

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2
Q

Diffusion

A

When particles spread and mix with each other without anything moving them. Diffusion into and out of cells occurs for particles that are small enough to pass through the cell surface membrane.

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3
Q

Concentration

A

The amount of a solute dissolved in a certain volume of solvent. Measured in units such as g/cm3.

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4
Q

Concentration gradient

A

The difference between two concentrations. There will be an overall movement of particles down a concentration gradient, from higher concentration to lower concentration.

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5
Q

Osmosis

A

The overall movement of solvent molecules in a solution across a partially permeable membrane, from a dilute solution to a more concentrated one.

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6
Q

Passive

A

A process that does not require energy is passive. A passive process is the opposite of an active process (which requires energy).

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7
Q

Semi-permeable

A

Describes something that will allow certain particles to pass through it but not others. Another term for ‘partially permeable’.

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8
Q

Solute

A

The solid that has dissolved in a liquid to make a solution

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9
Q

Solvent

A

The liquid in which a substance dissolves to make a solution.

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