What is diffusion?

• The movement of particles from an area of low concentration to an area of high concentration.

• The movement of particles from an area of high concentration to an area of even higher concentration.

• The movement of particles from an area of low concentration to an area of even lower concentration.

• The movement of particles from an area of high concentration to an area of low concentration.

Tags

NGSS.HS-PS1-5

Explain the process of diffusion with an example.

• Example: The diffusion of water from a dry paper towel into a glass of water.

• Example: The diffusion of oxygen from the alveoli in the lungs into the bloodstream.

• Example: The diffusion of salt from a salt shaker into a pot of boiling water.

• Example: The diffusion of carbon dioxide from the bloodstream into the alveoli in the lungs.

Define osmosis.

• The breakdown of glucose in the presence of oxygen

• The process of cell division

• Movement of water molecules across a semi-permeable membrane

• The movement of oxygen molecules across a cell membrane

Tags

NGSS.HS-LS1-3

Describe the movement of water during osmosis.

• Water moves only when there is an equal concentration of solute on both sides of the membrane.

• Water moves from an area of lower solute concentration to an area of higher solute concentration.

• Water moves from an area of higher solute concentration to an area of lower solute concentration.

• Water moves randomly without any specific direction during osmosis.

What is active transport?

• Movement of molecules across a cell membrane using energy

• Passive movement of molecules across a cell membrane

• Movement of molecules without using energy

• Transport of molecules within the cell using energy

Give an example of active transport in the human body.

• Facilitated diffusion

• Sodium-potassium pump

• Osmosis

• Simple diffusion

What is passive transport?

• Movement of substances across cell membranes without the need for energy input

• Movement of substances within the cell

• Active movement of substances across cell membranes

• Transport of substances using energy input

Explain how passive transport differs from active transport.

• Active transport does not involve the movement of molecules across the cell membrane

• Passive transport requires more energy than active transport

• Passive transport is the movement of molecules across the cell membrane without the use of energy, while active transport requires energy to move molecules against their concentration gradient.

• Passive transport moves molecules against their concentration gradient

What is facilitated diffusion?

• Spontaneous passive transport of molecules or ions across a biological membrane via specific transmembrane integral proteins.

• Movement of molecules or ions across a biological membrane via osmosis

• Transport of molecules or ions across a biological membrane via simple diffusion

• Forced active transport of molecules through a biological membrane

How do carrier proteins facilitate the process of diffusion?

• By creating a barrier that blocks the diffusion of molecules

• By preventing the movement of molecules across the cell membrane

• By breaking down molecules into smaller components

• By binding to specific molecules and transporting them across the cell membrane