Simple Diffusion
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Simple Diffusion
Osmosis- movement of water towards high solute concentration
Describe each solution relative to the RBC.
http://ilovebacteria.com/Images/blood.jpg
In A, how would you describe the solution the cells are in? And in B?
Isotonic solution
(B) Lysed (C) Shriveled
(D) Flaccid (E) Turgid (F) Shriveled
Hypertonic solutionHypotonic solution
Plantcell
Animalcell
(A) Normal
Plasmamembrane
(plasmolyzed)
Active Transport
• Move solutes against concentration gradient, [L][H]
• Requires energy from ATP (adenosinetriphosphate)
• Example, sodium potassium pump, K+ in and Na+ out
Transportprotein
Solute
Solute binding1 Phosphorylation2 Transport3
Proteinchanges shape
Protein reversion4
Phosphatedetaches
Active Transport
Transport of Large Molecules Across Membranes
Cells rely on:• Exocytosis• Endocytosis
a. phagocytosisb. pinocytosisc. receptor-mediated endocytosis
Phagocytosis
EXTRACELLULARFLUID
Pseudopodium
CYTOPLASM
Foodvacuole
“Food” orother particle
Foodbeingingested
Pinocytosis
Plasmamembrane
Vesicle
Plasma membrane
Pinocytosis- material in droplet not regulated
Coatedvesicle
Coatedpit
Specificmolecule
Receptor-mediated endocytosis
Coat proteinReceptor
Coatedpit
Material boundto receptor proteins
Plasma membrane
*human cells use process to take in cholesterol from blood
Phagocytosis
EXTRACELLULARFLUID
Pseudopodium
CYTOPLASM
Foodvacuole
“Food” orother particle
Pinocytosis
Plasmamembrane
Vesicle
Coatedvesicle
Coatedpit
Specificmolecule
Receptor-mediated endocytosis
Coat proteinReceptor
Coatedpit
Material boundto receptor proteins
Plasma membrane
Foodbeingingested
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