STRUCTURE OF CELL
- Cells are made up of components called cell organelles. - A cell is capable to live and CELL ORGANELLES Intermediate filament Plasma Membrane Rough endoplas reticulunm Microtubuko ertorm all their respective unctions due to the presence of Nuclous Nucleolus cell organelles Golgi apparatus Smooth endoplasmic reticulum vesicle Golgi vosicle ALL cells ha ve the same oxisome Cytoplasm organelles irrespective of their unction and organism they are found in ie. let it be a bone cell or a nerve cell or any other cell, all uwilL have components
The parts of cell are as follouws: Cell wall .PLasma membrane or cell membrane Nucleus .Cytoplasm Endoplasmic Reticulum Golgi Apparatus sosomes Mitochondria Plastids Vacuole
Plasma membrane - Plasma membrane is the outermost layer in cells. - It separates the content of cell from their external environment - It allows the materials from surrounding to enter and exit the cell. It also allows the materials from cell to exit outside. - It controls the entry and exit of materials in nd out of cell and hence it is called selectively permeable membrane. Gases Like carbon-dioxide also move in o out from high concentration to low concentration in a cell through the cell membrane by the process of diffusion. Cell Plasma Membrane or oxygen can - It also allous the movement of water in and out of the cell depending upon the concentration outside the cell by the process of osmosis.
Cell wall - Cell Wall is found in plant cells outside the plasma membrane. It is a rigid covering made up of cellulose which a complex substance is providing structural support to the plants. sosome Cytoplasm Ribosomes Nucleos Rough The contents of the cell wall contracts during Loss of water in plant cells by the process of Mitochondrion Cell wall Vacuole osmosis. - Due to the presence of cell wall plant cells can withstand greater changes in the surrounding media due to the exertion of equal pressure the cell when it swells up by taking up water through osmosis in a hypnotic media.
Cytoplasm thick solution composed of water, salts, and proteins that fills the cell is called cytoplasm It is surrounded by cell Membrane. Cytoplasm Nuclear membrane Nucleus Cell membrane Ribosomes - The nucleus of the cell is surrounded by the cytoplasm
Nucleus - The nucleus is small, round and membrane bound structure found in cell. Mitochondria The fluid inside the nucleus surrounded by nuclear membrane is called nucleoplasm Nucleus Vacuole - It controls the cell's growth and reproduction because it contains cell's hereditary information. Nucleolus is covered by dual layer called nuclear membrane, - It Golgi apparatus Endoplasmic Reticulum - The nuclear membrane contains pores due to which materials can travel both inside the nucleus from its outer surrounding i.e. cytoplasm.
The nucleus contains some thread like structures called chromatin. Il exists during the resting stage of cell. - The chromatin contains DNA (Deoxy-ribo nucleic acid), RNA (Ribo Nucleic acid) and proteins. - The nucleus contains some rod shaped structures in a cell that contains the hereditary information. They are called chromosome. - They are formed when the chromatin condenses together when the cell is about to divide. Chromosomes contain DNA and nuclear proteins. They contain the hereditary information for inheritance of features from the parents to the offspring as DNA. The DNA molecules contain the information for construction and organization of cells. Genes are the functional segments of DNA. Human body has 23 pairs of sex chromosomes. A boy has one X ckromosome and one Y chromosome whereas a girl has two X chromosomes - The nucleus of cell divides itself to give rise to new offsprings. - Genes present in the chromosomes decide the hereditary characters.
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