Cell Membrane and Transport Mechanisms

Front

What is the function of the cell membrane?

Back

The cell membrane controls the movement of substances in and out of the cell, providing protection and support.

Front

Define isotonic solution.

Back

An isotonic solution has the same concentration of solutes as the cell, resulting in no net movement of water.

Front

What happens to a cell in a hypertonic solution?

Back

The cell will shrink as water moves out of the cell to balance the solute concentration.

Front

Explain passive transport.

Back

Passive transport is the movement of substances across a cell membrane without the use of energy, typically from high to low concentration.

Front

What is active transport?

Back

Active transport is the movement of substances against their concentration gradient, requiring energy (ATP).

Front

Define osmosis.

Back

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

Front

What is endocytosis?

Back

Endocytosis is the process by which cells take in substances by engulfing them in a membrane.

Front

What is exocytosis?

Back

Exocytosis is the process by which cells expel materials in vesicles that fuse with the cell membrane.

Front

What is a hypotonic solution?

Back

A hypotonic solution has a lower concentration of solutes compared to the inside of the cell, causing water to move into the cell.

Front

Describe the role of transport proteins in the cell membrane.

Back

Transport proteins facilitate the movement of substances across the cell membrane, either passively or actively.