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6706968
Passive Transport
Descrição
Passive Transport
Sem etiquetas
biology
cells
passive transport
Mapa Mental por
Julie Thompson
, atualizado more than 1 year ago
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Criado por
Julie Thompson
mais de 7 anos atrás
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Resumo de Recurso
Passive Transport
DIFFUSION
small nonpolar molecules move through the hydrophobic region of the phospholipid bilayer
CO2
O2
H20
OSMOSIS
Slow
small amounts of H2O only
glycerol
ethanol
N2
uses kinetic energy of molecules
only effective over very small distances
moves molecules to reach an equilibrium
At equilibrium movement of molecules occurs but there is no net change
FACILITATED DIFFUSION
Requires a transmembrane protein that spans the phospholipid bilayer
CHANNEL PROTEINS
Aquaporins
Rapid movement of H2O
Ion channels
charged ions
Chlorine Cl-
Sodium Na+
Potassium K+
Calcium Ca2+
Hydrogen Ion H+
forms hydrophilic pore
CARRIER PROTEIN
Glucose transport into the cell
Uses Symport with Na+ and glucose
binds to a specific molecule
undergo a change in conformation
polar molecules
ions, amino acids, nucleoside, carbohydrates
does not require ATP
moves molecules along a concentration gradient from areas of high concentration to areas of low concetration
Anexos de mídia
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