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Title: How are calcium ions extruded from a cell? Post by: crazzyjazzy on Sep 28, 2010 Describe how a eukaryotic cell can extrude calcium ions from the cytosol to the extracellular fluid?
This is what I am thinking: So I know calcium concentration is kept low in the cytosol. Would the Ca2+ ions just diffuse passively out of the cell? or would the calcium be pumped out actively? I dont know if I am going about this question the write way ??? Title: Re: How are calcium ions extruded from a cell? Post by: bio_man on Sep 29, 2010 The inositol-phospholipid signaling pathway comes to mind.
hormone/signal binds to G-protein coupled receptor --> activates phospholipase C --> IP3 is formed -> it diffuses through the cytosol --> activates calcium channel to release calcium ions in ER storage --> triggers glycogen breakdown, vesicle release, and smooth muscle cells... That's how the calcium concentration increases in a cell. |