5.3 Diffusion Flashcards
1
Q
What is passive transport?
A
Transport of molecules
which does not require energy from cellular respiration
2
Q
What is diffusion?
A
net movement of particles
from a region of high to low concentration
3
Q
What factors affect the rate of simple diffusion?
A
-
TEMPERATURE
- Higher temperature = ￪ Ek = ￪ rate of diffusion
-
CONCENTRATION GRADIENT
- steeper concentration gradient = ￪ rate of diffusion
4
Q
What is simple diffusion?
A
Diffusion of particles
without the use of membrane proteins
5
Q
What is a partially permeable membrane?
A
a membrane
which allows some types of molecules through but not others
(selective)
6
Q
What factors affect the rate of diffusion across membranes?
A
- TEMPERATURE
- Higher temperature = ￪ Ek = ￪ rate of diffusion
- CONCENTRATION GRADIENT
- steeper concentration gradient = ￪ rate of diffusion
- SURFACE AREA
- larger surface area = ￪ rate of diffusion
- MEMBRANE THICKNESS
- thinner membrane = ￪ rate of diffusion
7
Q
In addition to temperature, concentration gradient, surface area & membrane thickness, what other factor affects the rate of facilitated diffusion?
A
number of channel proteins available
