Chapter 4 Flashcards
What are limitations for carrier-mediated transport
-Transport maximum
- Stereospecificity
- Saturation Point
- Competition
Which substance usually crosses a cell membrane using a pore
water
Where is a sodium-hydrogen counter-transporter most likely to be found
kidney proximal tubule
What pump can be run in reverse to create ATP if necessary
ATPase pump
ATPase pump
- 3 molecules of sodium are pumped out
- 2 potassium pumped in
- Has 3 binding sites for Na, and 2 for K
- Creates a slight negative advantage to the inside of the cell
What substance does not require a pore, channel or protein to cross the cell membrane
Carbon dioxide
Which has the most developed calcium ion pump to remove calcium from ICF
Sarcoplasmic reticulum
Skeletal muscle cells and liver cells have ________ for uptake of glucose
GLUT-4 transmembrane protein
Which is opened or closed by a change in electrical potential across the membrane
Voltage-gated channel
Which is opened or closed by changing the pressure on the channel or receptor
Mechanically gated
Which has a hydrogen ion pump to create an acidic environment
Parietal cells of the stomach
What uses facilitated diffusion
glucose uptake into cells
What substance usually crosses a cell membrane using a channel
sodium
Which is opened or closed by a molecule binding to a glycoprotein on the outer surface of the membrane
Ligand hated channel
Which substance does NOT require a pore, channel or protein to cross the cell membrane
alcohol
