Physiology (biomembranes) Flashcards
Cardiolipin
Membrane lipid- signature phospholipid of mitochondria
Cholesterol
Membrane lipid- structure to membrane
Glycolipid
Membrane lipid- carb present on outside of cell (blood group antigen)
Sphingolipids
Membrane lipid- enrich myelin sheath that surrounds axons
Sodium potassium pump
3x sodium out
2x potassium in
Voltage in cell
-70 mV
Types of active transport systems
Primary - uses direct source of chemical energy
Secondary - uses electrochemical gradient generated by active transport
Symport
Secondary active transport system- transported ions move in the same direction
Antiport
Secondary active transport system- transported ions move in the opposite direction
Sodium glucose cotransporter
symport - energy from sodium gradient
Liquid Crystalline phase
phospholipids are fluid and move around
Lipid rafts
Interaction of large saturated tails of sphingolipids with cholesterol
Passive transport
no energy
high to low
Simple diffusion
non- polar- uncharged molecules
high to low
Facilitated diffusion
larger
polar
needs transporter
