Diffusion and Osmosis

Front

What regulates what enters and leaves a cell?

Back

Cell Membrane

Front

What is diffusion?

Back

Diffusion is when molecules move from a high concentration to a low concentration.

Front

What type of transport uses no energy?

Back

Passive transport uses no energy.

Front

What happens to an animal cell placed in a hypertonic (salty) solution?

Back

The cell will shrink (get smaller).

Front

During osmosis, what moves from high to low concentration?

Back

Water moves from high to low concentration.

Front

Define 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 a selectively permeable membrane?

Back

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

Front

What is the difference between hypertonic, hypotonic, and isotonic solutions?

Back

Hypertonic solutions have a higher solute concentration than the cell, hypotonic solutions have a lower solute concentration, and isotonic solutions have equal solute concentration.

Front

What is active transport?

Back

Active transport is the movement of molecules against their concentration gradient, requiring energy.

Front

What role do proteins play in cell membranes?

Back

Proteins in cell membranes help transport substances and facilitate communication between the cell and its environment.