Chapter 3: CELL STRUCTURE & FUNCTION Unit 1: CELL: THE ...
Chapter 3: CELL STRUCTURE & FUNCTION
Unit 1: CELL: THE UNIT OF LIFE
What is a cell? Cell theory An overview of a cell
Cell Structure and Organelles Cell Molecular Components
Water and Chemical properties Cell Membrane
Osmotic Properties of cells Cell molecule transportation
VIKASANA - BRIDGE - COURSE 2012
WHAT IS A CELL?
Cell is the fundamental, structural and functional unit of all living organisms Robert Hooke (1665) ? an English scientist who observed honeycomb like dead cells and coined the term CELL Anton Von Leeuwenhock first described a living cell (1667) Robert Browne discovered nucleus (1833)
VIKASANA - BRIDGE - COURSE 2012
Mathias J Schleiden (1838) ; a German botanist and Theodore Schwann (1839) ; a British Zoologist proposed cell theory. All living organisms are composed of cells and product of cells All cells arise from pre existing cells through the process of cell division The body of living organisms is made up of one or more cells
VIKASANA - BRIDGE - COURSE 2012
Unicellular organisms ? Organisms with single cell, capable of independent existence and carries all functions like digestion,excretion ,respiration ,growth & reproduction (Acellular). Examples , Amoeba, Euglena Multicellular organisms ? Organisms with more than one cell Cells in multicellular organisms vary in size & shape depending on function.
VIKASANA - BRIDGE - COURSE 2012
SHAPE: Parenchyma - Polyhedral cells performs storage. Sclerenchyma - spindle shaped cells & provides mechanical support, Nerve cells- long and branched cells conducting nerve impulses RBC -Biconcave & helps in carrying oxygen Muscle cells- cylindrical or spindle shaped concerned with the movement of body parts.
VIKASANA - BRIDGE - COURSE 2012
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