Question

1. The sodium/potassium pump is:

   (select all that apply)

   		passive
   		active
   		electrogenic
   		electroneutral
   		a symporter
   		an antiporter
   		a uniporter

Answer 1

Ans. active, electrogenic , an antiporter

Explanation: Sodium/potassium pump is an active process which involves use of energy i.e. ATP. This pump is an antiporter (opposite movement of ions in and out of cell) in which for three sodium ions (Na+) move out of the cell, two potassium ions (K+) enter the cell. Hence, there is net change of one positive charge (reduced from the cytoplasm of the cell) and hence it leads to change in net electrical charge i.e. electrogenic.