Cell Transport

Front

What is active transport?

Back

Active transport is the movement of substances across a cell membrane against their concentration gradient, requiring energy (ATP).

Front

What is passive transport?

Back

Passive transport is the movement of particles across a cell membrane from an area of high concentration to an area of low concentration without the use of energy.

Front

What is osmosis?

Back

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

Front

What does the cell membrane do?

Back

The cell membrane controls what substances may enter or leave the cell, helping to maintain homeostasis.

Front

What is homeostasis?

Back

Homeostasis is the process by which a cell or organism maintains a stable internal environment despite changes in external conditions.

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 particles.

Front

What is an example of active transport?

Back

An example of active transport is the sodium-potassium pump, which moves sodium ions out of the cell and potassium ions into the cell against their concentration gradients.

Front

What is an example of passive transport?

Back

An example of passive transport is the diffusion of oxygen from the lungs into the bloodstream.

Front

What role do proteins play in cell transport?

Back

Proteins in the cell membrane can act as channels or carriers to facilitate the transport of substances across the membrane.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses transport proteins to help move substances across the cell membrane.