BAB 3 [ CHAPTER 3]
Hydrophilic head
attracted to water
Hydrophobic tails H2O H2O
Phospholipid bilayer
H2O H2O
carrier protein
H2O
Extracellular space
pore protein
Intracellular space Through the phospholipid bilayer OSMOSIS
Between the phospholipid bilayer Through the pore protein
Hydrophilic head Hydrophobic tails Lipid-soluble molecules
Phospholipid bilayer
Fatty acids
steroid
Glycerol
ADEK
Large water-soluble molecules Glucose Amino acid
carrier protein
Glycerol
Glucose Amino acid Na+ K+
Na+
K+
Extracellular space
pore protein
Intracellular space
Fatty acids Steroid ADEK
Inorganic ion (water soluble)
FACILITATED DIFFUSION
Hydrophilic head Hydrophobic tails
Small uncharged molecules
Phospholipid bilayer
O2
Extracellular space
pore protein
carrier protein
Intracellular space CO2 SIMPLE DIFFUSION
Hydrophilic head Hydrophobic tails Inorganic ion (water soluble)
Extracellular space
Phospholipid bilayer
K+ Na+
carrier protein
ATP
P P A P
P P A
ACTIVE TRANSPORT
pore protein
P ADP + Phosphorus
Intracellular space
MOVEMENT OF SUBSTANCES ACROSS THE PLASMA MEMBRANE
Passive transport Simple diffusion Osmosis Facilitated diffusion
Active transport
Active transport is the movement of molecules or ions from a region of lower concentration to a region of higher concentration across the plasma membrane
MOVEMENT OF SUBSTANCES ACROSS THE PLASMA MEMBRANE
Passive transport Simple diffusion Osmosis Facilitated diffusion
Active transport
Simple diffusion is the net movement of molecules or ions from a region of high concentration to a region of lower concentration
MOVEMENT OF SUBSTANCES ACROSS THE PLASMA MEMBRANE
Passive transport Simple diffusion Osmosis Facilitated diffusion
Active transport
Osmosis is the diffusion of water molecules from a region of low solute concentration to a region of high solute concentration through a semi-permeable membrane
MOVEMENT OF SUBSTANCES ACROSS THE PLASMA MEMBRANE
Passive transport Simple diffusion Osmosis Facilitated diffusion
Active transport
Facilitated diffusion refers to the movement of hydrophilic molecules or ions across the plasma membrane with the help of transport proteins
Hypotonic
TURGID
Isotonic
Hypertonic
PLASMOLYSIS
Hypotonic
Isotonic
Hypertonic
burst
shrink HAEMOLYSIS
CRENATION
Epidermis layer Distiled water
30% sucrose solution
Immersed in
Immersed in
17% sucrose solution
IMPORTANT EXPERIMENT Determining the concentration of an external solution which is isotonic to the cell sap of plant cells – PB pg27 Determining the effect of isotonic, hypotonic and hypertonic solutions on the stems of non-woody plants (spanish) – PB pg30