Cell Structure And Function Ppt Free Download – 2 1) Discovery of the Cell In 1965 Robert Hooke observed a piece of cork from a tree bark under a simple magnifying glass. He observed small boxes or compartments in the cork slice. The compartments are separated from each other by a wall or partition. He named each box a cell. The cells Hooke observed were actually the dead cells of plants. Javed

Some organisms are unicellular and some are multicellular. The number of cells in a tall tree or an animal such as an elephant or a human is billions of trillions of cells. Organisms made up of many cells are called multicellular organisms. Eg: A tree, an elephant. Organisms made up of only one cell are called unicellular organisms. Eg: Amoeba, Paramecium. Javed

Cell Structure And Function Ppt Free Download

Some cells keep changing their shape. Eg: Amoeba, white blood cells in humans. Some cells are spherical, round, elongated, spindle-shaped, or branched. Javed

Cell Structure And Function Powerpoint Questions Cells 1. What Is

5 4) Size of Cells Cells in living organisms are of different sizes. They can be as small as a millionth of a meter (micrometer or micron) or a few centimeters. The smallest cell is a bacterial cell (0.1 to 0.5 micrometers). The largest cell is an ostrich egg (17cm x 13cm). Javed

11 5) Parts of a Cell :- The main parts of a cell are cell membrane (plasma membrane), cytoplasm and nucleus. The cell membrane gives the cell shape, protects the cell’s interior, and allows materials to move in and out of the cell. In plant cells the cell membrane is covered by another thick covering called the cell wall. Cytoplasm is the jelly-like substance between the cell membrane and the nucleus. It contains other components (organelles) like mitochondria, Golgi bodies, ribosomes, vacuoles. The nucleus is a spherical body usually found in the center of the cell. It has a membrane called nuclear membrane. It contains a small spherical body called nucleolus and thread-like structures called chromosomes. Chromosomes carry genes that transfer letters from parents to offspring. Vacuoles are empty-looking structures in the cytoplasm. Vacuoles are larger in plant cells and smaller in animal cells. Plant cells have many small colored bodies in the cytoplasm called plastids. Green colored plastids are called chloroplasts. They contain chlorophyll which helps in photosynthesis. Javed

S.N. Part Plant cell Animal cell 1 Cell membrane present 2 Cell wall absent 3 Nucleus 4 Nuclear membrane 5 Cytoplasm 6 Plastids 7 Vacuole (small in size (large in size)) Javed

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Cardiac Transmembrane Ion Channels And Action Potentials: Cellular Physiology And Arrhythmogenic Behavior

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