All the components of a cell including the cell membrane are known as protoplasm. It is a colorless, jelly-like, viscous semi fluid substance which can be distinguished into a centrally located nucleoplasm and surrounding cytoplasm.
Protoplasm around nucleus is called cytoplasm. It is formed of proteins, nucleic acids, carbohydrates, lipids and certain inorganic substances. Many small organelles are found inside cytoplasm. These are known as cytoplasmic organelles. These organelles are the actual sites for various metabolic functions of the cells. Each organelle (tiny organ) is membrane-bound. Important cytoplasmic organelles are described below.