Cell division has three purposes for an organism: reproduction, growth and maintenance. For single-celled organisms, this is their direct and only method of reproduction, and it serves no other purpose. For multicellular organisms, cell division is a step in reproduction and is necessary for growth and maintenance.Know More
Cell division occurs in two different basic ways. The first, and by far the most common, is mitosis. Mitosis is the only way in which single-celled organisms divide, and the vast majority of cell division for multicellular life is mitosis as well. In mitosis, a cell divides into two smaller cells, known as daughter cells, with identical genes. In single-celled organisms, these daughter cells generally have the same basic characteristics as the parent cell. In multicellular organisms, these can either be similar to the parent cell or, as in the case of the production of blood cells, very different, although the genes are the same.
Meiosis, on the other hand, produces gametes, daughter cells that are structurally different from their parent cells and contain only half the number of genes. Theses gametes are used for sexual reproduction in multicellular life and must combine with another corresponding gamete before they can begin growing via mitosis.Learn More
One function of an astrocyte is to support cells that make up the blood-brain barrier, which keeps many toxins out of the brain. Astrocytes also help regulate the balance of ions outside of the cells, help nourish nerve cells and help the central nervous system heal after injury.Full Answer >
All members of the Animalia kingdom, colloquially known as animals, are multicellular. They are also exclusively heterotrophic, meaning that they rely on exterior sources for food.Full Answer >
Cells function similarly to factories in that both take up raw materials and use energy to produce waste and finished products. In the case of the cell, the finished products are proteins that can be used in building and operating the body.Full Answer >
The nucleus is designed to govern and control everything that happens within the entire cell, which includes the process of cell division. The nucleus is enclosed by a protective membrane, and it consists of three components, which are the nucleoplasm, chromosomes and the nucleolus.Full Answer >