Cell Transport

Front

What is a selectively permeable membrane?

Back

A membrane that allows some substances to pass through while blocking others, essential for maintaining homeostasis in cells.

Front

Why is passive transport called 'passive'?

Back

Because it occurs without the use of energy, relying on the natural movement of molecules down their concentration gradient.

Front

What role do channel proteins play in facilitated diffusion?

Back

Channel proteins assist in the movement of specific molecules across the cell membrane, allowing substances that cannot directly pass through the lipid bilayer to enter or exit the cell.

Front

What is active transport?

Back

The process by which cells move molecules against their concentration gradient, from an area of low concentration to an area of high concentration, requiring energy.

Front

What is exocytosis?

Back

A process by which a cell expels large quantities of materials, such as toxins and waste, by vesicles fusing with the plasma membrane.

Front

What is endocytosis?

Back

The process by which cells engulf external substances, bringing them into the cell within vesicles.

Front

What is the difference between passive and active transport?

Back

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

Front

What is diffusion?

Back

The movement of molecules from an area of higher concentration to an area of lower concentration until equilibrium is reached.

Front

What is osmosis?

Back

The diffusion of water molecules across a selectively permeable membrane from an area of low solute concentration to an area of high solute concentration.

Front

What is the function of the cell membrane?

Back

To protect the cell, provide structure, and regulate the movement of substances in and out of the cell.