The document describes the main parts of a cell, including the cell membrane, mitochondria, nucleus, ribosome, cytoplasm, and Golgi body. It provides details on the structure and functions of each part. The cell membrane forms the boundary of the cell and transports nutrients and waste. Mitochondria produce energy through chemical pathways. The nucleus contains genetic material and controls cell growth. Ribosomes produce proteins. The cytoplasm surrounds cell components except the nucleus. The Golgi body packages and secretes proteins within membrane-bound vesicles.