How are different substances transported across the cell membrane?

There are several different ways substances can be transported:

1) simple diffusion, i.e. substances that tend to be lipid soluble/ non-polar and can pass easily across the phospholipid bilyar of cells.                                                                                                                                                                   2) facilitated diffusion, which involves ihe roles of carrier proteins and channel proteins. E.g. oxygen and glucose       3) osmosis ( water is transported from an area of higher water potential to a lower water potential across a membrane.                                                                                                                                                                       4) active transport- involves the transport of substances against a concentration gradient and uses carrier proteins and ATP hydrolysis is required. An example of this is a sodium-potassium pump after an action potential.                     5) co-transport- this is when substances are simultaneously transported across a membrane by one protein e.g. the absorption of sodium ions and glucose by cells lining the mammalian ileum. 

VS
Answered by Vinay S. Biology tutor

9027 Views

See similar Biology GCSE tutors

Related Biology GCSE answers

All answers ▸

A man has a disease caused by a dominant allele. The mother has the disease but the father does not, explain how we know the man is heterozygous for this disease.


Respiration and photosynthesis-what are the similarities and differences?


Which are veins and which are arteries?


How would you investigate the effect of light intensity on the rate of photosynthesis in pondweed? [6]


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences