B1.6 Flashcards
What is diffusion?
The movement of particles from an area of high concentration to an area of low concentration.
Why is diffusion important for living organisms?
It allows cells to take in substances they need and get rid of waste products.
What is a concentration gradient?
The difference in concentration between two areas.
How does temperature affect the rate of diffusion?
Higher temperature increases the rate of diffusion.
How does surface area affect the rate of diffusion?
Larger surface area allows for faster diffusion.
How do cells increase their surface area to speed up diffusion?
By folding their membranes or having many tiny projections
How does diffusion help with gas exchange in the lungs?
Oxygen diffuses from the air in the lungs into the blood, and carbon dioxide diffuses from the blood into the air.
How does diffusion help with the absorption of nutrients in the small intestine?
Nutrients diffuse from the small intestine into the bloodstream.
What is the role of diffusion in the movement of substances within a cell?
Diffusion helps move substances like nutrients and waste products within the cell.
How does the concentration gradient affect the rate of diffusion?
A steeper concentration gradient leads to a faster rate of diffusion.
