Cell Membrane and Transport

Front

What is the function of the cell membrane?

Back

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

Front

Define 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 active transport?

Back

Active transport is the movement of particles across a cell membrane from an area of low concentration to an area of high concentration, requiring energy.

Front

What is osmosis?

Back

Osmosis is the movement of water across a selectively permeable membrane from an area of low solute concentration to an area of high solute concentration.

Front

What is diffusion?

Back

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

Front

What role do proteins play in the cell membrane?

Back

Proteins in the cell membrane assist in transporting substances across the membrane and can act as receptors for signaling.

Front

What is a selectively permeable membrane?

Back

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

Front

Explain the term '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 is the difference between endocytosis and exocytosis?

Back

Endocytosis is the process of taking substances into the cell, while exocytosis is the process of expelling substances from the cell.

Front

What is homeostasis?

Back

Homeostasis is the maintenance of a stable internal environment within an organism.