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Movement of Substances
Descripción
GCE 'O' Level Biology Mind Map on Movement of Substances, created by Elise Mac on 19/06/2016.
Sin etiquetas
biology
biology
gce 'o' level
Mapa Mental por
Elise Mac
, actualizado hace más de 1 año
Más
Menos
Creado por
Elise Mac
hace casi 8 años
238
1
0
Resumen del Recurso
Movement of Substances
Types
Passive
Does not require energy
Move ↓ conc. gradient
Eg.
Diffusion
Osmosis
Active
Requires energy
Move against / up conc. gradient
Diffusion
NET movement of particles frm a region of HIGH conc. to LOW conc.
Down conc. gradient
Conc. gradient
Diffeence in conc. btw 2 regions
Steeper grad.
↑ rate of diffusion
Factors affecting RATE
Conc. gradient
Steeper
↑ rate
Temperature
↑
↑ energy level of molecules
↑ rate
Size of particles
↓
↓ energy required to move particles
↑ rate
Thickness of membrane
Thin
↓ distance for particles to travel
↑ rate
May be unapplicable
Diffusion does not require a membrane
Eg.
Animal cells
Partially permeable membrane
Allow some substances through
Eg.
Lungs
Alveolus separated frm capillaries by a thin membrane
Diffusion
Gas exchange across membrane
Small intestines
Epithelium of villus
One-celled thick
↑ of diffusion
Digested food molecules into bloodstream
Practical Application
Kidney Dialysis
Diffusion
Wastes products removed frm blood through artificial membrane in machine
Blood cells & large molecules retained
Osmosis
NET movement of WATER molecules frm a region of ↑ WATER POTENTIAL to ↓ w.p
Across a PARTIALLY PERMEABLE MEMBRANE
Water potential
Tendency for water molecules to move frm 1 place to other
Eg.
Dilute solution
↑ water molecules per unit vol than a concentrated soln
Plants
Tugor pressure
Recursos multimedia adjuntos
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