Fun stuff! And just as I'm starting my hematology course! SO, just to be a smart-aleck... Jun8: Most cells have a variety of distinctive proteins embedded in

Fun stuff! And just as I'm starting my hematology course! SO, just to be a smart-aleck... Jun8: Most cells have a variety of distinctive proteins embedded in their membranes peculiar to cells of that type. Other cells and other elements (think antibodies) may detect and respond to some of these proteins. I wouldn't be surprised to find that plasmodium has some such mechanism. As for moving towards the cell, it probably doesn't take much in the bloodstream. Almost half of your blood's volume (45%) is cells, and about ninety-nine out of a hundred are red blood cells. With a cell for every cell-sized volume of fluid, that doesn't leave a lot of space between cells, so they're bumping up against each other all the time! It would probably be harder for a plasmodium to avoid hitting RBCs than to find one! Very interesting bit at the end, too. It almost looks like the cell's becoming crenellated as water is forced or drawn out. That would usually happen in a hypertonic solution, where the concentration of solutes is higher outside the cell than inside, but I'm sure that's not changing, here. I wonder if the solutes inside the cell are being taken up by the plasmodium's offspring as they develop? I could see that "purifying" the water inside, thus driving it out, maybe? Osmosis is a weird and wonderful thing...