Chapter 5 Flashcards
The boundary that separates the living cell from its non living surroundings
Plasma membrane
collage of different proteins embedded in the fluid matrix of the lipid layer(integral and peripheral proteins, cholesterol, and extracellular matrix)
Cell membrane
Proteins that penetrate the hydrophobic core of the lipid bilayer
Intergral proteins
Proteins that are loosely bound to the surface of the membrane
Peripheral proteins
Provide corridors and creates a channel for solutes to pass through
Channel proteins
Proteins that undergo a subtle change in shape and translocate the solute
Carrier proteins
6 major functions of membrane proteins
- Transport 2. Enzymatic Activity, 3. Signal transduction 4. Cell-cell recognition 5. Intercellular joining 6. Attachment to the cytoskeleton and extracellular matrix
A cell’s ability to distinguish
Cell-to-cell recognition
Diffusion of a substance across a membrane with no energy investment, move “down the gradient”, and create an equilibrium
Passive transport
The tendency for molecules of any substance to spread out early into the available space
Diffusion
The diffusion of water across a semipermeable membrane that is controlled by the concentrations of other molecules
Osmosis
Ability of solution to cause cell to gain or lose water due to solute concentration
Tonicity
Concentration of solutes is greater outside that inside of the cell
Hypertonic
Concentration of solutes is less than inside of the cell
Hypotonic
Proteins that low passage if hydrophilic substances across the membrane
Transport proteins
