Cells are the building blocks of all living organisms

  • Every single living organism is made up of cells .
  • The human body has from around a billion to trillions of cells .
  • Similarly other organisms are also made of a large number of cells based on their complexity.
  • Cells can be of various shapes and sizes based on their functions .


For example -

In the human body, the cells vary in their shape (could be polyhedral, oval, discoidal, cylindrical, spindle shaped) and size

  • The shape of the cells is decided by the function they perform :
  • White blood cells that defend the body against pathogens are Amoeboid shaped  
  • Nerve cells are long and branched that conduct nerve impulses  
  • Muscle cell s are  cylindrical or spindle shaped cells concerned with the movement of body parts
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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo