Chapter 3 Flashcards
Plasma Membrane (24 cards)
Types of Membrane Proteins (6)
Channels, Carriers, Receptors, Enzymes, Cell Adhesion Molecules, Recognition
Channels, Carriers, Receptors, Enzymes, Cell Adhesion Molecules, Recognition
Types of membrane proteins
Membrane protein that is transmembrane, allows for transport of large, insoluble elements, selective, and may or may not need ATP.
Carriers
Transmembrane proteins that allow for specific passage of small, soluble ions
Channels
Channels that have continuous lumen (open)
Leak channels
Channels that can open or close
Gated channels
Binds specific “chemical messengers”, initiates cellular changes (Type of membrane protein)
Receptor
What system are receptors involved in
Immune system
Anchor proteins to membrane and used in signaling
Membrane carbohydrates
bent/ununiform nonpolar tails
unsaturated bonds in nonpolar tails
Cell adhesion molecule: Stretch, tissues with a lot of pressure
Spot desmosome
Cell adhesion molecule: Stapling, many tight adhesions, kiss spots, epithelial layer
Tight Junctions
Cell adhesion molecule: Looks like ladder, allows passage of ions between cells, muscle cells
Gap Junctions
Two types of membrane transport
Active and Passive
Three forms of passive transport
Simple diffusion, facilitated diffusion, channels
Passive diffusion type for water, lipids, dissolved gasses
Simple diffusion
Passive diffusion that requires a carrier, high to low gradient
Facilitated Diffusion
Passive diffusion, when open movement if via diffusion, highly selective, for ions
Channels
Required high to low concentration difference
Passive diffusion
Fick’s law of diffusion
Rate of diffusion across a membrane
Transport that requires ATP
Active Transport
Types of Active transport
Primary and Secondary
Carriers that utilize ATP
Pumps
