Active Transport

Question 1

What does all active transport require? Which active transport has ATPase in the pump?

Answer 1

Energy
1˚

Question 2

Name the 3 primary active transports

Answer 2

Na/K ATPase pump, Ca pump, H+ pump (Proton pump)

Question 3

What is the function of Na/K ATPase pump? What is its function in Nerve/SkM + <3M? What is its function in all cell membranes?

Answer 3

3Na out, 2K in
Maintains RMP
Maintains volume

Question 4

What is the function of Ca+ pump?

Answer 4

pumps Ca+ out of cytoplasm (sarcoplasm) —> into sarcoplasmic reticulum (SR) / extracellular fluid

Question 5

Where are Ca+ pumps located?

Answer 5

Cell membrane of nerve + muscle
Membrane of SR

Question 6

What is the location + function of the proton pump (H+ pump)?

Answer 6

Parietal cells: decrease stomach pH
Distal convoluted tubule of kidney, intercalated cells: decrease urine pH

Question 7

Name + explain the 2 Secondary active transports

Answer 7

Symport (co-transport): Na/glucose; Na/AAs
Anti-port (counter-transport): Na+/Ca2+; Na+/H+

Question 8

What is the function of Symports? Where are they located?

Answer 8

Move Na/glucose or Na/AAs out of cell —> into blood
Sm intestine + Proximal convoluted tubule of kidney

Question 9

What is the function of Na+/Ca2+ Anti-ports? Where are they located?

Answer 9

Pump Na+ into cell, Ca2+ out of cell; most cells, “T” tubule heart

Question 10

What is the function of Na+/H+ Anti-ports? Where are they located?

Answer 10

Pump Na+ into cell, H+ out of cell into urine; Proximal convoluted tubule kidney