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Top 100 Schools in KCSE 2020 Daily Nation Form Two Biology Examination Best Schools KCSE 2019 Top 100 Kibokoni Secodary KCSE 2019 Results Top 200 Students KCSE 2020 2021 KCSEtop Schools Orero High School 2019 KCSE Results 2020 KCSE Results: Full List of All Top Candidate Top 100 Schools in KCSE 2021, KCSE2021, Knec KCSE Results 2021, KCSE Online Results, KCSE Online Results 2021, Kenya National Examination Council Results 2021, Top 100 Students KCSE 2021, KCSE Results 2019 Release Date KCSE 2019 e.g. The Release of This Year KCSE Exam Polarlity, • The cell membrane has electrical charges across its surface, it has positive charged ions on the outside and negatively charged ions on the inside, this property contributes to electrical impulses sent along nerve cells, • Sensitivity to changes in temperature and pH, • Very high temperatures destroy the semi-permeability nature of the cell membrane because the proteins are denatured by extreme pH values have the same effect on the membrane permeability, • Some of the physiological processes include diffusion, osmosis and active transport, • Diffusion is the movement of molecules or ions from a region of high concentration to a region of low concentration aided by a concentration gradient, • diffusion continues to occur as long as there is a difference in concentration between two regions (concentration gradient), • Stops when an equilibrium is reached i.e, , when the concentration of molecules is the same in both regions, • Diffusion is a process that occurs inside living organisms as well as the external environment, An increase in the concentration of molecules at one region results in a steeper concentration gradient which in turn increases the rate of diffusion, High temperature increases kinetic energy of molecules, They move faster hence resulting in an increase in rate of diffusion, and vice versa, The smaller the size of molecules or ions, the faster their movement hence higher rate of diffusion, The denser the molecules or ions diffusing, the slower the rate of diffusion, and vice versa, The medium through which diffusion occurs also affects diffusion of molecules or ions, For example, diffusion of molecules through gas and liquid media is faster than through a solid medium, This refers to the thickness or thinness of surface across which diffusion occurs, Rate of diffusion is faster when the distance is small i.e, thin surface, The larger the surface area to volume ratio, the faster the rate of diffusion, For example, in small organisms such as Amoeba the surface area to volume ratio, is greater hence faster diffusion than in larger organisms. 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