File Name: types of animal cells and their functions .zip
Cell , in biology , the basic membrane-bound unit that contains the fundamental molecules of life and of which all living things are composed. A single cell is often a complete organism in itself, such as a bacterium or yeast.
Animal cells are typical of the eukaryotic cell, enclosed by a plasma membrane and containing a membrane-bound nucleus and organelles. Unlike the eukaryotic cells of plants and fungi, animal cells do not have a cell wall. This feature was lost in the distant past by the single-celled organisms that gave rise to the kingdom Animalia. Most cells, both animal and plant, range in size between 1 and micrometers and are thus visible only with the aid of a microscope. The lack of a rigid cell wall allowed animals to develop a greater diversity of cell types, tissues, and organs. The ability to move about by the use of specialized muscle tissues is a hallmark of the animal world, though a few animals, primarily sponges, do not possess differentiated tissues.
The cell from Latin cella , meaning "small room"  is the basic structural, functional, and biological unit of all known organisms. Cells are the smallest units of life, and hence are often referred to as the "building blocks of life". The study of cells is called cell biology , cellular biology, or cytology. Cells consist of cytoplasm enclosed within a membrane , which contains many biomolecules such as proteins and nucleic acids. Organisms can be classified as unicellular consisting of a single cell such as bacteria or multicellular including plants and animals. Cells were discovered by Robert Hooke in , who named them for their resemblance to cells inhabited by Christian monks in a monastery. Cells are of two types: eukaryotic , which contain a nucleus , and prokaryotic , which do not.
Animal cells usually have an irregular shape, and plant cells usually have a regular shape. Cells are made up of different parts. It is easier to describe these parts by using diagrams:. Animal cells and plant cells both contain:.
Respiration occurs in every cell of your body. To understand respiration you maty need to find out more about cells and how they work. Do you know what the major organelles of the cell are called, and what each of these structures does? Click on the labels around the cell if you want to find out more!
Cell , in biology , the basic membrane-bound unit that contains the fundamental molecules of life and of which all living things are composed. A single cell is often a complete organism in itself, such as a bacterium or yeast. Other cells acquire specialized functions as they mature.
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The nucleus is spherical in shape and separated from the cytoplasm by a double membrane called the nuclear envelope.Reply