HB Passive TRANSPORT ONLY

Front

What is diffusion?

Back

Diffusion is the process by which molecules spread from areas of high concentration to areas of low concentration, allowing for the exchange of substances like oxygen and carbon dioxide in tissues and red blood cells.

Front

What type of solution are cells in when they are in a hypotonic environment?

Back

In a hypotonic solution, the concentration of solutes outside the cell is lower than inside, causing water to enter the cell, which may lead to swelling.

Front

What happens to cells in a hypertonic solution?

Back

In a hypertonic solution, the concentration of solutes outside the cell is higher than inside, causing water to leave the cell, which may lead to cell shrinkage.

Front

What is an aquaporin?

Back

Aquaporins are specialized integral proteins that facilitate the transport of water into and out of cells.

Front

Why is passive transport considered passive?

Back

Passive transport is considered passive because it does not require energy (ATP) to move substances across the lipid bilayer.

Front

What is 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 the role of the cell membrane in passive transport?

Back

The cell membrane acts as a barrier that selectively allows certain substances to pass through while preventing others, facilitating passive transport.

Front

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

Back

Isotonic solutions have equal concentrations of solutes inside and outside the cell; hypotonic solutions have lower concentrations outside, causing cells to swell; hypertonic solutions have higher concentrations outside, causing cells to shrink.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses integral proteins to help move substances across the cell membrane without the use of energy.

Front

What is a concentration gradient?

Back

A concentration gradient is the difference in the concentration of a substance across a space, which drives the movement of molecules during diffusion.