Define diffusion.
The process by which molecules spread from areas of high concentration to low concentration.
True or false: Diffusion requires energy input.
FALSE
Diffusion is a passive process that occurs naturally.
Fill in the blank: Osmosis is a type of diffusion involving _______.
Water
What is facilitated diffusion?
A process where molecules pass through a membrane via specific transport proteins.
Define concentration gradient.
The difference in concentration of a substance across a space.
True or false: Diffusion occurs faster in solids than in gases.
FALSE
Diffusion occurs fastest in gases due to higher molecular movement.
What factors affect the rate of diffusion?
Temperature, concentration gradient, and molecular size.
Fill in the blank: Diffusion is driven by _______.
Random molecular motion
What is passive transport?
The movement of substances across a cell membrane without energy use.
Define simple diffusion.
The direct movement of small or nonpolar molecules across a membrane.
True or false: Diffusion can occur in liquids and gases.
TRUE
What is the role of temperature in diffusion?
Higher temperatures increase molecular movement, speeding up diffusion.
Fill in the blank: Diffusion continues until _______ is reached.
Equilibrium
What is dynamic equilibrium?
A state where molecules continue to move but concentrations remain constant.
Define selectively permeable membrane.
A membrane that allows certain substances to pass while blocking others.
True or false: Diffusion requires a membrane.
FALSE
Diffusion can occur in open spaces without membranes.
What is Brownian motion?
The random movement of particles suspended in a fluid, contributing to diffusion.
Fill in the blank: Diffusion is essential for _______ in cells.
Nutrient uptake
What is concentration?
The amount of a substance in a given volume of solution.
True or false: Diffusion can occur in a vacuum.
FALSE
Diffusion requires molecules to move; a vacuum has no molecules.
What is active transport?
The movement of substances against a concentration gradient, requiring energy.
Fill in the blank: Diffusion is a key process in _______ exchange in lungs.
Gas
What is the difference between diffusion and osmosis?
Diffusion involves all substances, while osmosis specifically involves water.
Define equilibrium in the context of diffusion.
A state where the concentration of molecules is uniform throughout a space.
