Cell Transport

Front

What is cell transport?

Back

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

Front

Define endocytosis.

Back

Endocytosis is the process by which cells engulf substances from their external environment, bringing them into the cell.

Front

Define exocytosis.

Back

Exocytosis is the process by which cells expel materials to the outside environment, often involving the fusion of vesicles with the plasma membrane.

Front

What is osmosis?

Back

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

Front

What is passive transport?

Back

Passive transport is the movement of substances across a cell membrane without the use of energy, typically along the concentration gradient.

Front

What is active transport?

Back

Active transport is the movement of substances against their concentration gradient, requiring energy (usually in the form of ATP) to occur.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process by which molecules diffuse across a membrane with the help of transport proteins, moving from high to low concentration.

Front

What is the concentration gradient?

Back

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

Front

What role do protein channels play in cell transport?

Back

Protein channels facilitate the movement of specific molecules across the cell membrane, allowing substances that cannot pass freely to enter or exit the cell.

Front

What is the difference between simple diffusion and facilitated diffusion?

Back

Simple diffusion involves the direct movement of molecules across the membrane without assistance, while facilitated diffusion requires specific transport proteins.