I was thinking about lysosomes and how they maintain an acidic pH inside themselves by pumping H+ ions from the cytosol. Do hydrogen ions set up a concentration gradient that causes water to move by osmosis? If so, why doesn’t water rush in to the lysosomes to raise their internal pH?

  • $\begingroup$ Osmosis is prevented by cell membrane. $\endgroup$ Mar 19 '16 at 13:05
  • $\begingroup$ Why would that be the case? If osmosis couldn’t occur across phospholipid bilayers, we would be dead. $\endgroup$ Mar 19 '16 at 13:28
  • $\begingroup$ We have special pores like aquapores which enable osmosis only when required. Did not you read it in class 11? $\endgroup$ Mar 19 '16 at 13:30

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