4.0 Cell Transport 2023

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What is Facilitated Diffusion?

Back

Facilitated diffusion is the process of molecules diffusing across a membrane through protein channels, moving from an area of higher concentration to an area of lower concentration without the use of energy.

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What does Hypertonic mean in relation to cell transport?

Back

Hypertonic refers to a solution that has a higher concentration of solutes compared to the inside of the cell, causing water to exit the cell.

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What is Exocytosis?

Back

Exocytosis is the process by which a cell expels materials in vesicles that fuse with the cell membrane, releasing their contents outside the cell.

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What is Simple Diffusion?

Back

Simple diffusion is the movement of small nonpolar molecules from an area of high concentration to an area of low concentration directly through the phospholipid bilayer.

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What is Facilitated Diffusion?

Back

Facilitated diffusion is the process of passive transport of molecules across a biological membrane via specific transmembrane integral proteins.

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What is Osmosis?

Back

Osmosis is the diffusion of water molecules through a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

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What is Active Transport?

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Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, requiring energy (ATP).

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What is a Concentration Gradient?

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A concentration gradient is the difference in the concentration of a substance across a space, which drives the movement of molecules during diffusion.

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What is a Selectively Permeable Membrane?

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A selectively permeable membrane is a barrier that allows certain substances to pass through while blocking others, crucial for maintaining homeostasis in cells.

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What is the role of Protein Channels in Facilitated Diffusion?

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Protein channels provide a pathway for specific molecules to pass through the cell membrane, facilitating their movement down the concentration gradient.