Cell Membrane & Transport

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the movement of particles across a cell membrane through protein channels, following the concentration gradient, without the use of energy.

Front

Define diffusion.

Back

Diffusion is the free movement of particles across a membrane from an area of higher concentration to an area of lower concentration.

Front

What type of transport is affected if the body can no longer make ATP?

Back

Active transport would be impacted because it requires energy (ATP) to move substances against their concentration gradient.

Front

What is passive transport?

Back

Passive transport is the movement of substances across cell membranes without the need for energy input.

Front

What is the primary function of the plasma membrane?

Back

The primary function of the plasma membrane is to regulate what enters and leaves the cell.

Front

What is the difference between active transport and passive transport?

Back

Active transport requires energy to move substances against their concentration gradient, while passive transport does not require energy and moves substances along their concentration gradient.

Front

What role do protein channels play in facilitated diffusion?

Back

Protein channels assist in the movement of specific molecules across the cell membrane, allowing them to pass through more easily.

Front

What is osmosis?

Back

Osmosis is the diffusion 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 a concentration gradient?

Back

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

Front

What happens to a cell in a hypertonic solution?

Back

In a hypertonic solution, water moves out of the cell, causing it to shrink.