CELL – THE BASIC UNIT OF LIFE

CELL – THE BASIC UNIT OF LIFE

Cell is defined as basic structural and functional unit of life.

Living things are composed of trillions of cells and all has specialized function. All the functions we perform are basically performed by cells as cells make required proteins or necessary elements for the function. For example, cells turn the food we eat into the molecules that our body needs by chemical reactions. Thus, cells are the functional unit of life.

Living things are organised at different levels of organisation. Cells are composed of tissues such as human body made up of four basic types of tissue which are epithelial, connective, muscular, and nervous tissue. Organs are made up of two or more tissues that are organized to carry out a particular function, for example cardiac muscle tissue is found in the heart and contractions of these cardiac muscle pump blood to parts of body. Organs combined to form organs system such as in respiratory system, nostrils, trachea, alveoli, lungs etc. are combined to make respiratory system. Thus, cells are structural unit of life also as it makes the structure of body.

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