Exploring Diffusion Concepts

What is the primary environment in which cells in your body exist?

• Blood

• Air

• Water

• Tissue

What characteristic of cell membranes allows them to control what enters and exits the cell?

• Rigidity

• Impermeability

• Selective permeability

• Flexibility

What is the term for the movement of substances across a cell membrane without the use of energy?

• Osmosis

• Endocytosis

• Active transport

• Passive transport

What natural process causes particles to spread from areas of high concentration to areas of low concentration?

• Absorption

• Diffusion

• Filtration

• Excretion

What is the term for the differences in concentration that drive diffusion?

• Pressure

• Osmosis

• Equilibrium

• Gradients

What happens when a state of equilibrium is reached in diffusion?

• Particles stop moving

• Particles disappear

• Particles are evenly mixed

• Particles move to one side

How do cells get the oxygen they need to survive?

• Through endocytosis

• Through active transport

• By diffusion through the cell membrane

• By osmosis

What happens to carbon dioxide that builds up inside a cell?

• It is converted into oxygen

• It diffuses out into the surrounding blood

• It stays inside the cell

• It is used for energy

What is the term for the state where substances are constantly diffusing to even out differences?

• Dynamic equilibrium

• Static equilibrium

• Passive transport

• Active transport

What is it called when a cell uses energy to move substances across its membrane?

• Passive transport

• Active transport

• Osmosis

• Diffusion