Cells Flashcards
Edema
Extra fluid outside cell
Plasma membrane
Polar out, nonpolar in (phospholipids)
What creates doors in the plasma membrane and what are they for?
Proteins; for macromolecules
Ion channels
Na in, K out
Glycocalyx
Extracellular matrices touch each other
Extracellular matrix
Creates rigidity; anchors, shapes, positions cell movement; connected to cytoskeleton on inside of cell
Tight Junctions
Lock cells together to prevent things from getting in between them (ziploc bag)
Desmosomes
Add strength; tough thickened skin
Gap Junctions
Channels between cells (hole in door)
Cell Junctions
Passive transport moves toward equilibrium, active moves away
Passive transport
Simple diffusion, facilitated diffusion, osmosis
Simple diffusion
Material goes from high to low concentration
Facilitated diffusion
Need ion channels (door), carrier or transport molecule
Diffusion is influenced by…
Concentration, molecular size, temperature
Tonicity
Difference between water in and out of a cell
Isotonic
Nothing changes
Hypertonic
Too much salt (lose water)
Hypotonic
Cells take in water
Active transport
Sodium-potassium pump; essential for muscle and nerve tissues to have ATP
Secondary Active Transport
Move glucose into cell by hitching onto Na
