Name and briefly describe four methods in which molecules and ions may pass through a cell membrane?

A. Osmosis - the movement of water down a water potential gradient through a partially permeable membrane.
B. Diffusion - the net movement of molecules or ions down a concentration gradient.
C. Active Transport - movement of molecules or ions against the concentration gradient, which requires an input of energy from the cell.
D. Facilitated Diffusion - passive movement of molecules or ions across a cell membrane with the aid of transport proteins.

Related Human Biology GCSE answers

All answers ▸

Give possible reasons why increase in pulse rate after exercise may be different for each individual.


What is the difference between the CNS and the PNS?


How does the structure of a ball and socket joint allow it to bring about movement?


What is the role of red blood cells in our body?


We're here to help

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