Part of cells and cell organelles in living things

Cells have a major part, ie the cell membrane, the cell nucleus and cytoplasm. In contrast to animal cells, plant cells have a cell wall in the outer membrane of the cell. The main part of cells and cell organelles will be described below:

1. Membrane cell

Cell membrane or plasma membrane is the outermost part of the cell that limit the contents of the cell and its surroundings. This membrane is composed of two layers consisting of phospholipids and proteins. Cell membrane is semipermeable or selectively permeable, which controls the entrance and exit of substances from the cell.

2. The cytoplasm

The cytoplasm is the cell fluid contained within the cell, except the nucleus and organelles within the cell. Bersifatkoloid cytoplasm, which is not solid and not liquid. The cytoplasm contains few organelles following, among others

• endoplasmic reticulum
• Golgi Apparatus
• Lysosomes
• Mitochondria
• peroxisome and glioksisom
• plastid
• vacuole
• The cytoskeleton
• centrioles
• Ribosomes

3. Nucleus

Nucleus of eukaryotic cells have a nucleus membrane. The composition of the same core membrane molecules with the molecular composition of the cell membrane, in the form of lipoproteins. Pores in the membrane core allows the relationship between the nucleoplasm and cytoplasm. In the core are:

• nucleolus, serves to synthesize a wide range of RNA molecules that are used in the assembly of ribosomes. Ribosomes essential for protein synthesis in cells.
• chromatin granules contained in the nucleoplasm, was evident at the time the cells do not divide. By the time a cell divides, chromatin granules thickened into thread-like structures called chromosomes. Chromosomes contain DNA that serve to convey genetic information through protein synthesis.
• nucleoplasm is a substance composed of protein.

4. The cell wall

Only found in the cell walls of plant cells. At the young cells, adult cell wall composed of pectin substances. In the adult cells to form cell walls of cellulosic materials that are kalu that form plant cell tends to remain.

In the cell walls are thickened part, which is part of the so-called nodes. Through the relationship of plasma cell node occurs one to another cell called plasmodesmata. Plasmodemata be overhung plasma, which serve as the entry and exit doors substances.

Most of the contents of the cell in the form of water. The water pressure or the contents of the cell to the cell wall called turgor pressure. Cell wall and vacuole plays a role in cell turgiditas.

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