structure and function of cell pdf
Overview of Cell Structure and Function Cells are the fundamental units of life, defined by the classic cell theory of Schleiden,Schwann and Virchow. Their plasma membrane regulates osmosis, diffusion and nutrient transport, while internal organelles such as mitochondria, ribosomes and the nucleus coordinate metabolism and control. Foundations of Cell TheoryCell theory emerged in the 19th century as a unifying principle for biology. Matthias Schleiden proposed that all plants are composed of cells, while Theodor Schwann extended the idea to animals, asserting that th