The document compares various parts of a school to organelles and their functions in a cell. It states that the plasma membrane regulates what enters and exits the cell like an administrative assistant controls the school, the nucleus controls all cell activities like the principal directs the school, and the cytoplasm contains all the organelles and cell activities like the school floor contains desks and materials. It also compares the endoplasmic reticulum to the cafeteria kitchen where proteins are assembled, lysosomes to janitors that break down waste, the cytoskeleton to support beams that maintain the cell's shape, centrioles to buses that transport materials in the cell, the nucleolus to a teacher directing an assembly, and mitochondria to the lunch