Cell Transport

Question 1

What are the intracellular [ion]?

Answer 1

Na+ - 15 mM
K+ - 150 mM
Ca2+ - 0.2 uM
Cl- - 3mM

Question 2

What are the extracellular [ion]?

Answer 2

Na+ - 145 mM
K+ - 4 mM
Ca2+ - 1.8 mM
Cl- - 114 mM

Question 3

What is the electrostatic value intracellularly vs extracellularly?

Answer 3

-35mV to -90mV depening on the cell type Therefore +ve ions will try to enter the cell

Question 4

What are the 2 main forces driving the movement of molecules?

Answer 4

Chemical (out of the cell) and electrical (into the cell)

Question 5

Primary active transport example

Answer 5

Na-K-ATPase pump. 3 Na+ out for 2 K+ in. ATP->ADP + Pi.

Question 6

Secondary active transport examples

Answer 6

Co-transport. e.g. Glucose and Na+ enter cell.

Counter-transport. e.g. Ca-Na exhange. Na+ leaves cell + K+ enters. Na+ enters cell and Ca2+ leaves cell.