Why would the simple diffusion of chloride ions across a cell membrane be extremely slow?

There are differnet ways that substances can move across a cell surface; simple diffusion, facilitated diffusion, osmosis or active transport. Most substances can move across the cell membrane via simple diffusion providing they are small and non-polar. However, chloride ions are charged negatively and so they can't cross the membrane down the concentration gradient without any help. This is because polar molecules are water soluble and the centre of the bilayer is hydrophobic. Therefore, they move via facilitated diffusion using carrier proteins.

Answered by Jess B. Biology tutor

36332 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

It has been suggested that smoking, an epigenetic factor can lead to tumour growth and cancer. Use your knowledge of the epigenome and its structure to explain how this could occur. [5 marks]


What specialised structures do the lungs have to allow diffusion of gases?


Describe the development and propagation of an action potential in response to a stimulus (6 marks)


What are the different types of epistasis?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences