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CHAPTER 2

Cell as a unit of life2.1 WHAT IS A CELL?0 A cell is the basic unit of life.

0 Its size is too small to be seen with the naked eye.

0 We need an instrument called a microscope to observe cells.

FunctionsTo digest food and absorbs nutrient

FunctionsTransport oxygen and digested food to the bodyCarries unwanted excretory materials to organs to be disposed by the body

FunctionsInhales oxygen into the body and exhales carbon dioxide out of the bodyDuring respiration, the exchange of oxygen and carbon dioxide gases occur in the alveolus

FunctionsCoordination of body activities, such as digestion and metabolism

FunctionsPreserves the body shapeProvides support and protection to internal organs such as the heart, lungs and other organs

FunctionsEnables body movementMuscles usually react as opposing pairs to produce movement

FunctionsProduces offspring to continue the generation

FunctionsDispose waste from the bodyLung- Carbon dioxide and water vapourSkin- Urea, mineral salt and waterKidney Urea, Mineral salt and water

FunctionsCo-ordinates and control all activities in the bodyResponds to the stimuli when the sensory organs receive impulses from brain

FunctionsBody defenseRemove bacteria from the tissue