This is a set of membranes that form sacs and tubes,which are joined together with the cellular and nuclear membrane. There are two kinds,

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When a cell is not in state of division and is the phase know as interphase, its nucleuses more or less spherical and located in the center or near the periphery.During the interphase, we can distinguish the following structures:

Nuclear membrane-this is a covering formed by two membrane covered in ribosomes.The membranes has perforations called nuclear pores which allows substances to be exchange the nucleus and the cytoplasm.
Nucleplasm- this is the liquid in the nucleus
Nucleolus-this is rounded structure that is darker than the rest of the nucleus.It is where the components of the ribosomes are created.
Chromatin-This is made up of DNA filaments and proteins.During cell division, it condenses and forms chromosomes.There will be as many chromatin filaments as chromosomes the cell has during its division phase.
1.Mitochondria- cellular respiration takes place in the mitochondria.This process burns nutrients in the presence of oxygen to obtain energy and releas Co2.
2.Ribosomes-ribosomes manufacture a cell's proteins.
3.Golgi apparatus-the golgi apparatus collects substances and uses vesicles to transport them to different part of the cell or outside it.
4.Endoplasmatic reticulum- the rough endoplasmic reticulum creates proteins via the ribosomes that are joined to its membrane and it stores them or transports the to the golgi apparatus.
5.Lysosomes and other vesicles- lysosomes performs cellular digestion in other words the decomposed substances to obtain other useful substances that provide nutrition for the cell.Other vesicles related to golgi apparatus activity have different fuctions such as storing suctances transporting
6-Chloroplast-photosynthesis takes place inside them.
7-Large Vacuoles- the liquid in the vacuoles exerts pressure inside the cell.This pressure is needed to maintain the cell's rigidy.
8-Cell wall-the cell wall protects the cell and providesrigity
9-Centrioles-they direct the separation of the chromosomes during the cellular reproduction.They are involved in the formation of structures that produce cell movement such as cilia or flagela.
10.Cilia and flagella-the allow the cell to move in a liquid environment or to move liquid and particles over its surface.

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