Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
9 Cards in this Set
- Front
- Back
|
What is simple diffusion? |
Simple diffusion is the net movement of molecules or ions from a region of high concentration to a region of lower concentration until evenly distributed. |
|
|
What is the difference between simple diffusion and facilitated diffusion? |
Facilitated diffusion is a passive process that requires special proteins: protein channels and carrier proteins to diffuse the particle. |
|
|
What type of particles can diffuse via simple diffusion? |
Small and uncharged particles |
|
|
What type of energy does facilitated diffusion solely rely on? |
Kinetic energy |
|
|
What is the definition of osmosis? |
The net movement of water molecules in a region of high water potential to region of lower water potential through a partially permeable membrane. |
|
|
What have the highest water potential? |
Pure water have the highest water potential of 0kPa. |
|
|
What is an isotonic solution? |
An isotonic solution is when two solutions have the same water potential which keeps them at equilibrium. |
|
|
What is facilitated diffusion? |
Movement of substances from high concentration to lower concentration using protein carriers. |
|
|
What is the role of the sodium-potassium pump in the Ileum? |
- sodium ions are pumped out of the epithelial cells (via a protein carrier molecule) by the sodium-potassium pump - this maintains a much higher concentration of sodium ions in the lumen of the intestine than in the epithelial cells - sodium ions can now diffuse down this concentration gradient through a co-transport protein and carry either amino acid molecules or glucose molecules with them. - the glucose/amino acid molecules will pass into the blood plasma via another type of carrier protein |
