All of the functions for cell expansion, growth and replication are carried out in the cytoplasm of a cell. The organelles inside cytoplasm are very important for the maintenance of the cell. Some of the most important organelles that cytoplasm contains are the mitochondria, proteins, ribosomes, the endoplasmic reticulum, the Golgi apparatus, lysosomes and the cytoskeleton. Mitochondria are sites of energy-making, because they contain the materials necessary for ATP synthesis, or the fueling of the cell. The cytoskeleton is a network of protein fibers that give support to the cell, and help it maintain shape.
Lysosomes are small sacs of digestive enzymes in the cell for eating.
Proteins and ribosomes move through the cell acting as catalysts for various chemical processes. In a roundabout way, some genetic material does reach the cytoplasm. The endoplasmic reticulum is an RNA-coding area, before this information is sent to the nucleus. If a person is born with irregular cytoplasm, in most cases they do not live. Cytoplasm is so essential to the cell, it requires working order to operate and maintain life.