Cell Structure & Functions Notes

• Organisms differ from one another structurally and functionally but all are made up of cells. All living organisms carry out certain basic functions.
• The basic structural and functional unit of an organ is the cell.

Discovery of the Cell:

• Robert Hooke in 1665 observed slices of cork under a simple magnifying device. He noticed partitioned boxes or compartments in the cork slice. These boxes appeared like a honeycomb. Some box was separated from the other by a wall Hooke coined the term ‘cell’ for each box.

• The cell in a living organism is the basic structural unit.
• Each organ is further made up of smaller parts called tissues.
• A tissue is a group of similar cells performing a specific function.
• Many tissues together constitute an organ, organ forms organ system which further co-ordinates to form an organism.
• Each tissue, organ, organ system performs different functions in living system.

For example: