Cell: the cell is a highly complex system that is the site of intense energy exchange and which presents vast interphase surfaces. Like all living organisms, it feeds itself, grows, multiplies and dies.
Chromatin: pat of the nucleus of a cell visible by microscope. It consists of a dense, weblike, interconnected mass.
Nucleus: central part of a cell which contains the chromosomes.
Mitochondrion: microstructure of cytoplasm which plays a role in oxydation and the storage of energy in a cell.
Nucleolus: nuclear particle that plays a role in the physiology of a cell.
Nuclear membrane: very thin organic tissue that envelops the nucleus of a cell.
Protein: compound composed of amino-acids, with a large molecular weight.
Melanin: cutaneous pigment.
Cell membrane: fine membrane covering a cell.
Ribosome granule: cytoplasmic organelle that plays an important role in the synthesis of proteins in a cell.
Glycogen: substance that produces glucose in human organisms.
Cytoplasm: gel containing the cell.
Endoplasmic reticulum: mesh of fibres in the central part of cytoplasm.
Golgi apparatus: granulation system of cytoplasm.
Centrioles: ponticulus at the centre of a centrosome.
Lysosome: intracellular organelle able to absorb solid particles from the surrounding area.