Question

In three to five sentences, explain why animal cells do not require a cell wall or a central vacuole for their functions.

Answer 1

Animal cells don’t need a rigid cell wall because their shape and mechanical support are provided by the cytoskeleton and, in tissues, by the extracellular matrix, which also allow flexibility, motility and close cell–cell contacts. The central vacuole’s main plant roles—large-scale water and ion storage, waste sequestration and turgor pressure—are handled in animals by many small vesicles/lysosomes, membrane ion pumps and whole-body systems (blood, kidneys) that regulate volume and osmotic balance. Lacking a cell wall also permits dynamic behaviors such as endocytosis, cytokinesis and migration that are essential for animal development and immune function. Together these alternatives make a rigid wall and a single large vacuole unnecessary for animal physiology.