Diffusion Watch

Petch_su
Badges: 0
Rep:
?
#1
Report Thread starter 3 years ago
#1
Please help with this question
Explain why diffusion is described as the net movement of molecules or ions.
Thank you
0
reply
Petch_su
Badges: 0
Rep:
?
#2
Report Thread starter 3 years ago
#2
One more question...
Describe how epithelial cells of the villi absorb molecules of glucose from the gut contents.
0
reply
alkyone
Badges: 12
Rep:
?
#3
Report 3 years ago
#3
For the first one: diffusion depends on molecules moving freely in a medium to achieve a uniform concentration. It's the net movement because if you imagine molecules crossing a membrane for example they can move in or out, it's just that they will be moving more towards the side with the lowest concentration.

The epithelial cells have glucose transporters to take up glucose.
0
reply
Petch_su
Badges: 0
Rep:
?
#4
Report Thread starter 3 years ago
#4
(Original post by alkyone)
For the first one: diffusion depends on molecules moving freely in a medium to achieve a uniform concentration. It's the net movement because if you imagine molecules crossing a membrane for example they can move in or out, it's just that they will be moving more towards the side with the lowest concentration.

The epithelial cells have glucose transporters to take up glucose.
Thank you
0
reply
nohaha
Badges: 2
Rep:
?
#5
Report 3 years ago
#5
(Original post by Petch_su)
Please help with this question
Explain why diffusion is described as the net movement of molecules or ions.
Thank you
This is because diffusion occurs when there is a concentration gradient between two regions. It continuous until the same concentration is reached for both regions. While the particles are still moving about ( after the concentration is the same at both regions), the concentration will remain the same as there is no net movement. At this point it is no longer called diffusion!
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts

All the exam results help you need

811

people online now

225,530

students helped last year

University open days

  • Sheffield Hallam University
    Clearing open day Undergraduate
    Tue, 20 Aug '19
  • Bournemouth University
    Clearing Open Day Undergraduate
    Wed, 21 Aug '19
  • University of Dundee
    Undergraduate Open Day Undergraduate
    Mon, 26 Aug '19

Are you going to self-release into Clearing?

Yes I've pressed the button (98)
18.96%
No I'm happy with my uni offer (329)
63.64%
Not yet but I am planning to (24)
4.64%
Not yet but I might (66)
12.77%

Watched Threads

View All
Latest
My Feed