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Diffusion
Preparation for Physiology Assessment
| Question | Answer |
|---|---|
| What is Simple Diffusion? | The diffusion of solute particles dissolved in water through a selectively permeable membrane |
| The Driving force for diffusion is? | The kinetic energy of the molecules in motion |
| The reason NaCl did not diffuse to the right side was because.. | The membrane pore size was too small |
| The rate of diffusion for urea compared to NaCl is... | Slower than that for sodium b/c urea is a larger molecule |
| Describe 2 variables that affect the rate of diffusion | Molecule size & concentration gradient |
| Put the following in order from smallest to largest molecular weight: glucose, sodium chloride, albumin, and urea. | Sodium chloride < urea < glucose < albumin |
| The purpose of increasing the concentration of NaCl from 9 to 18 was to.. | Increase the rate of diffusion |
| How does the concentration affect the rate of facilitated diffusion? | The greater the concentration difference b/w one side of the membrane & the other, the greater the rate of facilitated diffusion |
| How does the number of proteins affect the rate of facilitated diffusion? | |
| How do transport proteins become saturated? | If too much solute is present & the max transport rate is increased |
| Why do some solutes require carrier proteins through pass through a membrane? | Size/Solubility limitations |
| What does facilitated diffusion rely on? | Carrier Proteins |
| Examples of solutes that may require facilitated diffusion are | glucose, sodium & potassium |
| What would not affect the rate of facilitated diffusion? | The amount of intracellular ATP |
| What variables increased the rate of glucose? | increased concentration of glucose & increased number of membrane carriers |
| Explain one way in which facilitated diffusion is the same as simple diffusion | Same: they both transport molecules along or down the concentration gradient of the solute and tdo not require energy from an outside source. |
| Explain one way in which facilitated diffusion differs from simple diffusion | Difference: facilitated diffusion requires a membrane bound carrier protein to aid in the transportation of a molecule across the membrane. simple diffusion occurs WITHOUT the assistance of membrane proteins. |
| Na+ Cl- had no effect on glucose transport because | sodium is not required for glucose transport in the simulation |
| The larger value obtained when more glucose carriers were present corresponds to an increase in the rate of glucose transport. Explain why the rate increased | The rate of glucose transportation increased when more glucose carriers were present, since more glucose molecules could bind to the glucose carriers present. This resulted in an increase number of glucose molecules to cross the membrane. |
| Simple diffusion is directly proportional to... (3) | Membrane permeability, concentration gradient & membrane surface area |
| Simple diffusion is inversely proportional to... (1) | membrane thickness |
Created by:
meunid