Cell Membrane & Transport Flashcards
Describe the movement of Na+ and K+ in the Na/K Pump
3 Na+ ions into the cell against the concentration gradient and 2 K+ ions out of the cell into the plasma
What are the major functions of active transport?
Uptake essential nutrients, remove waste and secretory products, create concentration gradients
What are the three subcategories of channels?
Porins, Aquaporins, Ion Channels
True or False. Carrier proteins display saturation kinetics.
TRUE
What three parameters are indirectly proportional to diffusion rate?
Thickness, Molecular Weight, Solute Polarity
What three parameters are directly proportional to diffusion rate?
Concentration, Lipid Solubility, Surface Area
Movement without energy, carrier, or channel is termed?
Simple Diffusion
Movement via carriers or channels is called?
Facilitated Diffusion
What solutes diffuse through the plasma membrane passively?
Gasses, hydrophobic molecules (steroids), small and uncharged molecules (water, ethanol)
This carbohydrate-rich area on the cell surface assist with cell recognition and identification.
Glycocalyx
What stimulates the scramblase? What is activation indicative of?
Ca2+, indication of apoptosis
In which direction does the floppase direct phospholipids?
Out
This transporter directs phospholipids in the membrane inward.
Flippase
Where does plasma membrane lipid synthesis begin?
Smooth ER. Then moves to the Golgi.
On which side of the membrane are glycolipids more commonly found?
Outer-side/membrane surface
