4: Transport Across Membranes Flashcards

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1
Q

Plasma membranes

A

All membranes that are around and within all cells

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2
Q

Phospholipids

A

Important components of a cell-surface membrane

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3
Q

Protein channels

A

Trans membrane proteins that allow the passage of specific larger substances across the membrane

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4
Q

Carrier proteins

A

They bind to ions or molecules, them change shape in order to move these molecules across the membrane

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5
Q

Fluid-mosaic model

A

The way to describe the way in which all the various molecules are combined into the cell surface membrane, and that the interrelationship between the phospholipids and proteins can be altered and changed

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6
Q

Diffusion

A

The net movement of the molecules or ions from a region where they are more highly concentrated to one where their concentration is lower until evenly distributed

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7
Q

Facilitated diffusion

A

The passive process by which charged ions and polar molecules diffuse across the cell-surface membrane through protein channels and carrier proteins

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8
Q

Osmosis

A

The passage of water from a region where it has a higher water potential to a region where there it has a lower water potential through a selectively permeable membrane

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9
Q

Active Transport

A

The movement of molecules or ions into or out of a cell from a region of lower concentration to a region of higher concentration using ATP and carrier proteins

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10
Q

Co-Transport

A

The individual movement of molecules using a concentration gradient which had already been set up by active transport

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11
Q

Sodium-potassium pump

A

Where sodium ions are actively removed from the cell/organelle and ions are actively taken in from the surroundings

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