Cell Transport

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What is cell transport?

Back

Cell transport refers to the movement of substances across the cell membrane, which can occur through various mechanisms such as diffusion, osmosis, and active transport.

Front

What is diffusion?

Back

Diffusion is the passive movement of small molecules from an area of higher concentration to an area of lower concentration until equilibrium is reached.

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What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that allows large or polar molecules to cross the cell membrane with the help of transport proteins.

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What is active transport?

Back

Active transport is the movement of molecules against their concentration gradient, requiring energy (ATP) to move substances from low to high concentration.

Front

What is endocytosis?

Back

Endocytosis is the process by which cells engulf large molecules or particles by enclosing them in a membrane vesicle to bring them into the cell.

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What is exocytosis?

Back

Exocytosis is the process by which cells expel large molecules or particles by fusing a vesicle with the cell membrane, releasing its contents outside the cell.

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What role does the cell membrane play in homeostasis?

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The cell membrane controls the movement of substances in and out of the cell, helping to maintain a stable internal environment (homeostasis).

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What are phospholipids?

Back

Phospholipids are molecules that make up the cell membrane, consisting of a hydrophilic (water-attracting) head and two hydrophobic (water-repelling) tails.

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What is osmosis?

Back

Osmosis is the passive movement of water molecules across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

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What is a selectively permeable membrane?

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A selectively permeable membrane allows certain substances to pass through while restricting others, maintaining the internal environment of the cell.