Animal CellThe model cell that you are looking at is an animal cell. The model is labeled with all of the typical organelles within a cell membrane. The following words are parts of the cell structure and the different jobs each one performs:Cell Membrane- phospholipid-protein bilayer ;separates cell content from the environment Animal Cells Essay Words | 4 Pages. Animal cells are the ‘cell factories for the production of complex biomolecules and antibodies for use as prophylactics, diagnostics or therapeutics’.Culturing of immortalized animal cell, also called cell lines is generally performed under define temperature, humidity and carbon dioxide flux in lab condition Plant cells and animal cells both have a cytoskeleton, endoplasmic reticulum (smooth and rough), golgi apparatus, mitochondrion, nucleus, plasma membrane, and ribosomes. Animal and plant cells also have vacuoles, but they are rarely found in animal cells. Vacuoles in animal cells are very small compared to the vacuoles in plant cells
In this essay we will animal cell essay about the cell. After reading this essay you will learn about: 1. Definition of Cell 2. Discovery of Cell 3, animal cell essay. Cell Theory 4. Modern Cell Theory 5. Limit of Cell Size or Volume 6. Types 7. Compartmentalization for Cellular Life 8. Cell— An Open System 9. Shapes Essay 1, animal cell essay. Cell is a basic unit of life as no living organism can have life without being cellular because cell is a unit of both its structure and function. All life begins as a single cell. A number of organisms are made of single cells. They are called unicellular or acellular, e. Amoeba, Chlamydomonas, Acetabularia, bacteria, yeast. Anything less than a complete cell cans neither lead an independent existence nor perform all the functions of life.
A multicellular organism is made of many cells. A animal cell essay animal or plant contains billions of cells. For example, a newly born human infant has 2 x cells. The number increases to trillion x or cells in the body of 60 kg human being. A drop of blood contains several million cells. The large sized organisms do not have large sized cells. Instead they possess higher number of cells. In multicellular organisms, cells are building blocks of the body or basic units of body structure. Of course, they become specialized for performing different functions. Human body has some types of cells, e. Cells are grouped into tissues, tissues into organs and organs into organ systems.
Occurrence of different types of tissues, organs and organ system results in division of labour or performance of different functions of the body by specialised structures, animal cell essay. Cells are not only the building blocks of the organisms, they are also the functional units of life. Life passes from one generation to the next in the form of cells. The activities of an organism are actually the sum total of activities of its cells. Each cell of the body possesses the same genetic information though mature cells may become specialized to perform specific functions. A new cell always develops by division of a pre-existing cell. Cells are totipotent, i. Internally each cell is build up of several organelles.
The organelles perform different functions just like the ones carried on by different organ systems of the body. All life activities of the organism are present in miniature form in each and every cell of its body. Thus, cell is a basic unit of life and structural and functional unit of an organism. It is the smallest unit capable of independent existence and performing the essential functions of life. Essay 2. Work on the study of cell has continued for more than the last three and a half centuries. It required microscopes or instruments with good resolving power and magnification. Techniques like preservation, sectioning, staining and mounting were needed to distinguish various cellular components. Improvement in tools and techniques has continued all this period to enhance our knowledge about the cell, animal cell essay.
The first microscope was built by Zacharias Janssen in It was first modified by Galileo and then by Animal cell essay Hooke Fig. Robert Hooke was a mathematician and physicist. He developed a new microscope animal cell essay which he studied the internal structure of a number of plants. His work is famous for the study of cork cells. He took a piece of cork animal cell essay spanish oak and prepared thin slice by means of sharp pen knife. A deep planoconcave lens was used for throwing light on cork piece. The latter was observed under the microscope. The piece of cork was found to have a honey comb structure with a number animal cell essay boxes like compartments, each having a pore and separated from others by diaphragms Fig.
Robert Hooke named the compartments as cellulae singular- cellula now known as cells Latin cella — hollow spaces or compartments. He did not know the significance of these structures and regarded them as passages for conducting fluids. Robert Hooke found that the cells or boxes were not very deep. A cubic inch contained , animal cell essay, cells, a square inch 1, 66, and one inch strip cells. Cells were also observed prior to Hooke, animal cell essay, by Malpighiwho called them saccules and utricles. Leeuwenhoek was first to observe, describe and sketch a free living cell.
He observed bacteria, protozoa, spermatozoa, red blood cells, etc. In the beginning of nineteenth century it became clear that the bodies of organisms are made of one or more cells. Robert Brown discovered the presence of nucleus in the cells of orchid root. Living semifluid substance of cells was discovered by Dujardin and named sarcode. Schleiden found all plant cells to have similar structure— cell wall, a clear jelly-like substance and a nucleus, animal cell essay. Schwann discovered that animal cells lacked cell wall. Purkinje and von Mohlrenamed sarcode or the jelly like substance of the cells as protoplasm Gk. protos- first, plasma- form. Cell membrane was discovered by Schwann but was provided with a name by Nageli and Cramer Soon various organelles were discovered inside the cells.
Electron microscope has elaborated our knowledge about cells. Essay 3. Animal cell essay of cell theory illustrates how scientific methodology operates. It involves observation, hypothesis, formulation of theory and its modification. Observations were started by Malthias Schleidena German botanist who examined a large number of plant tissues, animal cell essay. He found that all plant tissues were made of one or the other kind of cells. Therefore, animal cell essay, he concluded that cells constitute the ultimate units of all plant tissues.
Theodore Schwanna German Zoologist, studied different types of animal tissues including development of embryos. He found that animal cells lack a cell wall. Instead they are covered by a membrane. Otherwise cells of both plants and animals are similar. Schwann defined a cell as membrane en-locked, nucleus containing structure. He also proposed a cell hypothesis — bodies of animals and plants are made of cells and their products. The theory proposed that cells are the units of both structure and function of organisms. Rudolf Virchow observed that hew cells develop by division of the pre-existing cells— Omnis cellula e cellula theory of cell lineage or common ancestry, animal cell essay.
The finding gave cell theory its final shape. Louis Pasteur further proved that life originated from life. Soon Haeckel established that nucleus stores and transmits hereditary traits. Cell theory was modified accordingly. Each cell is made of a small mass of protoplasm containing a nucleus in its inside and a plasma membrane with or without a cell wall on its outside. Activities of an organism are the sum total of activities and interactions of its constituent cells. Essay 4, animal cell essay. Modern Cell Theory : It is also known as cell doctrine or cell principle. Cells are units of structure in the body of living organisms. Every cell is made up of a mass of protoplasm having a nucleus, organelles and a covering membrane. Cells are units of function in living organisms, that is, the activities of an organism are the sum total of the activities of its cells.
The cells belonging to diverse organisms and different regions of the same organism have a fundamental similarity in their structure, animal cell essay, chemical composition and metabolism. Depending animal cell essay specific requirement, the cells get modified, e.
Plant vs Animal Cell Essay
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Plant cells and animal cells both have a cytoskeleton, endoplasmic reticulum (smooth and rough), golgi apparatus, mitochondrion, nucleus, plasma membrane, and ribosomes. Animal and plant cells also have vacuoles, but they are rarely found in animal cells. Vacuoles in animal cells are very small compared to the vacuoles in plant cells Essay on the Functions of Cell Parts. Essay # 1. Definition of Cell: ADVERTISEMENTS: Cell is a basic unit of life as no living organism can have life without being cellular because cell is a unit of both its structure and function. All life begins as a single Animal and Plant cells consist of most of the same cell types‚ but the whole shape of the cell is quite different. An animal cell is a round‚ uneven shape‚ whereas the Plant cell has an affixed shape. They have a more of a rectangular shape. Chloroplast‚ Vacuole and the Cell wall are only found in Plant cells. The Chloroplast is the organelle for the whole system of Photosynthesis
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