Respiratory and Excretory System

Things to remember

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• A human respiratory system is a group of the organ that is responsible for taking in oxygen and expelling carbon dioxide.
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• The main respiratory organ is lungs.
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• The respiratory system consists of nose, pharynx, larynx, trachea and lungs.
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• Larynx is also known as the voice box.
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• Without oxygen, our body cannot perform life activities.
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•  The main function of the excretory system is to remove waste from the body.
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• Each kidney contains millions of nephron which help to filter nitrogenous substances from the blood.
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