376. Stempel's idea as to how the contractile vacuole works appears to differ fundamentally from my conception of its mechanism. He regards it as a preformed organ of the cell, developed to ...

and the lytic vacuoles of acidic pH, which are equivalent in function to lysosomes in mammalian cells (Figure 1). A special feature of guard cells is that they can increase or decrease their ...

And then you'll have a model plant cell with all of its parts. A cell wall, which keeps everything together, cell membrane, which surrounds the cytoplasm, vacuole, the space within the cytoplasm ...