This lesson introduces diffusion as a key process for the movement of substances in and out of cells. Students learn that diffusion is the net movement of particles from an area of higher ...

Sticky spots on cell membranes hold onto the master regulator of cell polarity, helping to ensure that the regulatory protein accumulates in high enough concentrations to trigger cell polarity. Over ...

GCSE Biology worksheet on diffusion with answers, covering concentration gradients, temperature, surface area and diffusion in biological systems. Questions focus on diffusion in the alveoli, small ...

This video explains how particles spread through diffusion from areas of high concentration to low concentration. Different factors affect the rate of diffusion – temperature, concentration gradient ...