Factors effecting rate of movement

• Size of the molecules ( small molecules diffuse faster )
• Lipid soluble or water soluble / electrically charged ( lipid soluble molecules are faster )
• Temperature / pH ( increased temp and correct pH speeds movement )
• Concentration ( increased movement occurs down a gradient )
• Availability of protein carriers ( for facilitated diffusion and active transport ) active transport is usually faster than diffusion
• Speed of individual protein carriers ( faster they work the faster the rate of active transport or facilitated diffusion )
• Inhibitors linked to active transport ( increased oxygen increases respiration so more ATP )
• Thickness ( faster movement across thinner membrane due to shorter diffusion pathway )
• Surface area of membrane