PhysioEx Lab Report
Exercise 1: Cell Transport Mechanisms and Permeability
Activity 2: Simulated Facilitated Diffusion
Name: Sara Ross Date: 27 January 2023
Session ID: session-0f7b2b9f-cd61-a567-2e3a-3363926e7184
Pre-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.
1 Molecules need a carrier protein to help them move across a membrane because
You correctly answered: they are lipid insoluble or they are too large.
2 Which of the following is true of facilitated diffusion?
You correctly answered: Movement is passive and down a concentration gradient
3 Examples of solutes that might require facilitated diffusion include
You correctly answered: all of the above
4 Which of the following would not affect the rate of facilitated diffusion?
You correctly answered: the amount of intracellular ATP
Experiment Results Predict Questions
1 Predict Question 1: What effect do you think increasing the number of protein carriers wil have on the glucose transport rate?
Your answer: The glucose transport rate will decrease.
2 Predict Question 2: What effect do you think adding Na 'Cl -will have on the glucose transport
rate?
Your answer: The glucose transport rate will decrease
Stop & Think Questions 1 What happened to the glucose transport rate when the glucose concentration was increased from 2 mM to 8 mM?
Your answer: The glucose transport rate decreased
Correct answer: The glucose transport rate increased
2 Describe the conditions that resulted in the fastest rate of glucose transport
You correctly answered: 700 glucose carrier proteins and 8 mM glucose
3 Why do you think equilibrium wasn't reached?
You correctly answered: The membrane proteins were saturated
Experiment Data
Run Number
Solute
Start Conc. L Start Conc. R (mM) (mM) 0.00 0.00
Carriers
Rate (mM/sec) 0.0000
1 1
Na* CI-
500 500 500 500 700 700 700 700
Glucose Na* CI- Glucose Na* CI- Glucose Na* CI- Glucose Na* CI- Glucose Na* CI- Glucose
2.00 0.00 8.00 0.00
0.00 0.00 0.00 0.00
0.0008
2 2 3 3 4 4 5 5 6 6
0.0000 0.0023
0.0000
2.00
0.00
0.0010
0.00 8.00
0.00 0.00
0.0000 0.0031
0.00 10.00
0.00 0.00
100 100
0.0000 0.0017
0.00 2.00
2.00 0.00
700 700
0.0042 0.0010
Post-Iab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly
1 What variable(s) increased the rate of facilitated diffusion of glucose?
You correctly answered: increasing the concentration of glucose and increasing the number
of membrane carriers.
2 For facilitated diffusion, increasing the concentration of glucose on one side of the
membrane is the same as
You correctly answered: making the concentration gradient steeper.
3 When all of the membrane carriers are engaged, or busy, we say they are
You correctly answered: saturated.
4 Na*cI- had no effect on glucose transport because
You correctly answered: sodium is not required for glucose transport in the simulation.
Review Sheet ResuIts
1 Explain one way in which facilitated diffusion is the same as simple diffusion and one way in
which it is different from simple diffusion.
Your answer:
They are the same