Biology - Diffusion 0.0 / 5 ? BiologyCells, tissues and organsGCSEAQA Created by: LunaShomeiRoseCreated on: 12-10-18 17:34 One way molecules can move in and out the cell is from ___ Diffusion! 1 of 15 Define diffusion (think of a can of deodorant and how it spreads) The spreading out of particles from high to low concentration. 2 of 15 Diffusion is a ___ (overall) movement Net 3 of 15 Name three molecules that move in/out cell by diffusion Oxygen. Carbon Dioxide. Urea 4 of 15 So, cells need oxygen for __ (carried out by mitochondria) Respirtaion 5 of 15 Cells are surrounded by a ___ concentration of oxygen High 6 of 15 Why is this? Oxygen is transported into bloodstream by lungs. 7 of 15 Why does oxygen move into the cell by diffusion? (high-low) High - low concentration. Higher conc in bloodstream, around the cell, and lower in the cell. 8 of 15 The oxygen will move into the cell, becoming a higher concentration then outside, meaning it will then move... Out of the cell 9 of 15 Another molecule that moves by diffusion is Urea. What is urea? A waste product produced inside cells 10 of 15 It diffuses __ of cells, and __ the blood plasma (yellowish liquid that holds blood cells), and is exerted by the ___ Out of cells. Into blood plasma. Exerted by kidneys. 11 of 15 The concentration gradient can effect the rate of diffusion. What is it? The difference in concentration 12 of 15 The ___ the conc. gradient the ___ the rate of diffusion. Greater conc. gradient, faster rate. OR Lower conc. gradient slower rate 13 of 15 The rate can also be effected by temp. why? High temp, more kinetic energy, faster movement 14 of 15 The larger the surface area of the membrane, the ___ rate of diffusion. Greater 15 of 15
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