the physio ex

M01_ZAO2177_01_SE_CH01.QXD

3/4/11

1:36 AM

Page 13

R E V I E W

S H E E T
EXERCISE

NAME_________________________________
LAB TIME/DATE ________________________

A C T I V I T Y

1

1

Cell Transport Mechanisms and Permeability

Simulating Dialysis (Simple Diffusion)

1. Describe two variables that affect the rate of diffusion. ______________________________________________________
__________________________________________________________________________________________________
2. Why do you think the urea was not able to diffuse through the 20 MWCO membrane? How well did the results compare with your prediction? ____________________________________________________________________________________
3. Describe the results of the attempts to diffuse glucose and albumin through the 200 MWCO membrane. How well did the results compare with your prediction? ___________________________________________________________________
__________________________________________________________________________________________________
4. Put the following in order from smallest to largest molecular weight: glucose, sodium chloride, albumin, and urea. ______
__________________________________________________________________________________________________
A C T I V I T Y

2

Simulated Facilitated Diffusion

1. Explain one way in which facilitated diffusion is the same as simple diffusion and one way in which it differs. __________
__________________________________________________________________________________________________
2. 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. How well did the results compare with your prediction? ___________________
__________________________________________________________________________________________________
3. Explain your prediction for the effect NaϩClϪ might have on glucose