The Cell Structure

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The cell Structure consists of  cell membrane Cytoplasm and  Nuleus.

It is structural and functional unit of all living organisms. It is composed of cytoplasm and nuleus enclosed by cell membrane.cell are of different shapes and sizes. It consist of cytoplasm and nucleus.

Structure of an Animal cell:

 Cell membrane:

This is outermost boundary of an animal cell. It is also called plasma membrane.It is composed of lipids and proteins (lipoproteins).A cell membrane is  semi-permeable.

Cell membrane surrouThnds the cytoplasm and nuleus in all type of cells. In plants and becteria, cell membrane itself is surrounded by a cell wall.

FUNCTION:It  regulates selective movement of molecules into and out of the cell. It allows certain molecules to pass through it while others can  not pass thought it.

 

Cell membrane takes in material by infolding in the form of vacuoles. It is called endocytosis.

 

2: CYTOPLASM:

The protoplasm outside nucleus is called cytoplasm. The cytoplasm exhibits active streaming movements around the inner surface of the cell. This movement is known as cyclosis. It is composed of organic compound such as proteins, carbohydrates, lipids (Fats), enzymes and some inorganic compound e.g water and salts.

Some important cytoplasmic organelles found in eukaryotic cells are as under.

1: Endoplasmic reticulum 2: Golgi complex

3: Mitochondria 4: Plastids (in case of plant cells).

5: Centrioles 6: Ribosomes. 7: Vacuoles.

5: NUCLEUS (KARYON):

It was discovered by Robert Brown in 1831. It may be spherical or irregular in shape.In animal cell it is usually present in the centre but in plant cell due to the presence of a large vacuole, it is pushed towards the cell membrane.Nuleus is surrounded by a double membrane called the nuclear membrane. Nuleus is filled with a gel like substance called nuleoplasm.

It was discovered by Robert Brown in 1831.It may be spherical or irregular in shape.In animal cell it is usually present in the centre but in plant cell due to the presence of a large vacuole,it is pushed towards the cell membrane.Nuleus is surrounded by a double membrane called the nuclear membrane.Nuleus is filled with a gel like substance called nuleoplasm.   

  

 

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