Cell Transport

Diffusion

random movement of molecules from an area of higher concentration to an area of lower concentration.

what substances diffuse in and out of cells

Water, glucose, amino acids, oxygen and waste products urea and carbon dioxide. (urea has been unmentioned in booklet but it was in the seneca so)

temperature effects on diffusion

temperature increase= diffusion increase

concentration gradient effects on diffusion

higher concentration = diffusion speed increase

surface area effects on diffusion

greater surface area : volume ratio = greater speed of diffusion

how to calc surface area : volume ratio

calc surface area then volume then simplify

how are small intestine, lungs, plant roots and leaves adapted for diffusion

big surface area : volume ratio

how is an exchange surface adapted

big surface area : volume ratio

osmosis

like diffusion but water through a partially permeable membrane

active transport

Energy-requiring process that moves material across a cell membrane against a concentration difference