Phospholipid bilayer
glycolipids
-Lipids with polar sugar groups on outer membrane surface -sugar containing lipid with carbohydrate attached
phospholipids
-phosphate heads: polar and hydrophilic -fatty acid tails: nonpolar and hydrophobic -tails touch, heads point outward
cholesterol
-scattered within the hydrophobic regions of the membrane -increases membrane stability
phospholipid bilayer
-structure of the plasma membrane -contains several different types of lipids (phospholipid, cholesterol, glycolipid) with proteins embedded in it
Channel Protein
A transport protein that forms channels that allow specific molecules to flow through
Fluid mosaic
Phospholipid Bilayer with various protein molecules floating around within it. The 'Fluid' part represents how some parts of the membrane can move around freely, if they are not attached to other parts of the cell. The 'mosaic' part illustrates the 'patchwork' of proteins that is found in the Phospholipid Bilayer.
Carrier protein
Proteins that change shape to allow a substance to pass through the plasma membrane
facilitated diffusion
a passive form of carrier transport
Sodium-Potassium Pump
an active transport mechanism that moves ions in order to achieve polarization
selectively permeable/semi permeable
cell membrane is one that allows certain molecules or ions to pass through it by means of active or passive transport.
active transport
the movement of any substance across a cell membrane with the use of energy ATP
Passive Transport
the movement of any substance across a cell membrane without the use of cell energy
Endocytosis
the process by which a cell engulfs and surrounds large substances
exocytosis
the process by which wastes are packaged in vesicles and leave the cell