Vacuoles usually account for changes in cell size when the cytoplasmic volume stays constant. Some vacuoles have specialized functions, and plant cells can have more than one type of vacuole.

Vesicles and vacuoles are membrane-bound sacs that function in storage and transport. Vacuoles are somewhat larger than vesicles, and the membrane of a vacuole does not fuse with the membranes of other cellular components. Vesicles can fuse with other membranes within the cell system ( Figure 5.11. 1 ).

Google Classroom Review your understanding of cell parts and functions in this free article aligned to NGSS standards. Key points: All cells have a cell membrane that separates the inside and the outside of the cell, and controls what goes in and comes out.