Homeostasis and Cell Processes

Front

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

Back

A semi-permeable cell membrane allows only certain particles to cross into or out of the cell, controlling the movement of substances.

Front

What is homeostasis?

Back

Homeostasis is the maintenance of an internal balance of conditions in a changing external environment.

Front

What is active transport?

Back

Active transport is the movement of materials across the cell membrane from areas of low concentration to areas of high concentration, requiring energy from the cell.

Front

What is passive transport?

Back

Passive transport is the movement of materials across the cell membrane without the use of energy, such as diffusion and osmosis.

Front

What is diffusion?

Back

Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration.

Front

What is osmosis?

Back

Osmosis is the diffusion of water molecules across a semi-permeable membrane.

Front

How do molecules move in diffusion?

Back

Molecules move from areas of high concentration to areas of low concentration until equilibrium is reached.

Front

What is the role of energy in active transport?

Back

Energy is required in active transport to move substances against their concentration gradient.

Front

What happens to molecules in a cell during diffusion?

Back

Molecules will move into or out of the cell based on concentration gradients.

Front

What is the difference between active and passive transport?

Back

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