Passive transport

Front

What is passive transport?

Back

Passive transport is the movement of substances across a cell membrane without the use of energy, relying on concentration gradients.

Front

What is diffusion?

Back

Diffusion is the process by which molecules spread from an area of high concentration to an area of low concentration.

Front

What does it mean for a cell membrane to be semi-permeable?

Back

A semi-permeable membrane allows certain substances to pass through while blocking others.

Front

What is the role of the cell membrane in passive transport?

Back

The cell membrane controls the movement of substances in and out of the cell, allowing for selective permeability.

Front

What is osmosis?

Back

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

Front

What is facilitated diffusion?

Back

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

Front

What is the concentration gradient?

Back

The concentration gradient is the difference in the concentration of a substance between two areas.

Front

What is the difference between passive transport and active transport?

Back

Passive transport does not require energy and moves substances along the concentration gradient, while active transport requires energy to move substances against the concentration gradient.

Front

What is an example of a substance that moves via diffusion?

Back

Oxygen and carbon dioxide are examples of substances that move across cell membranes via diffusion.

Front

What is the significance of selective permeability in cell membranes?

Back

Selective permeability allows cells to maintain homeostasis by regulating the internal environment and controlling what enters and exits.