Diffusion and active transport Flashcards
What is concentration gradient?
The difference in concentration of particles.
What does more concentrated mean?
More particles.
What does it mean to move down a concentration gradient?
High to low concentration.
What does it mean to move against a concentration gradient?
Low to high concentration gradient.
What does permeable mean?
Allows substances to pass through.
What does partially permeable mean?
Allows small molecules through but not larger molecules.
What is a solute?
A substance dissolved in a solvent to make a solution.
What does turgid mean?
When something is firm.
What does passive mean?
Does not require energy.
What does diffusion mean?
The spreading of particles of any substance in a solution or gas, from a high concentration to a low concentration.
Does diffusion happen in a liquid only, gas only, or both?
Both.
Name 2 places where diffusion occurs, and give details.
Lungs- gas exchange of oxygen and carbon dioxide in the alveoli.
Kidneys- waste products such as urea are excreted into the blood plasma.
Name 4 factors that affect the rate of diffusion and explain how they affect diffusion. Hint- tftm.
Concentration gradient
Temperature
Surface area of membrane
Thickness of membrane
Substances move in and out of cells across a cell ________.
Membrane.
Diffusion is the spreading of particles of a substance in a solution or particle of gas from a ____ concentration to a ___ concentration.
High, low.
