(GED Science/Life Science; Lesson 3)- Human Body System

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The human body system works together to perform a specific task. Examples of human body system are circulatory, digestive, reproductive, nervous, respiratory etc. The human body consists of four levels of organization which are listed below: 

  1. Cells 
  2. Tissues; e.g. muscle tissue 
  3. Organs; e.g. stomach
  4. Body system; e.g. digestion
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The respiratory system 

Respiratory system involves the nose, throat, trachea and lungs


  • it brings oxygen from the atmosphere into the body 
  • when we exhale, it takes out waste in form of carbon dioxide
  • Inside the respiratory systems, oxygen diffuses into blood and carbon dioxide diffuses out of the blood

The nervous system

It involves the brain, spinal cord, and nerves.


  • It receives information, process and also transmits it.
  • Information is being transmitted from the brain to and fro through the nerves.
  • Cerebellum is part of the brain that coordinates movement and positioning.
  • The brainstem controls breathing and heart rates.
  • Cerebrum controls speaking, thinking, and seeing.

The digestive system 

It involves the mouth, esophagus, stomach, small intestine, and large intestine


  • It breaks down food into nutrients which are in turn used to produce energy.
  • It also gets rid of waste product from the body.

The circulatory system (cardiovascular system)

It involves the heart and the blood vessels


  • It moves blood which carries substances like oxygen and nutrients throughout the body.
  • While carbon dioxide and waste pass from the cell into the blood.
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  1. ……….. System communicates with each cell of the body system? A. The urinary B. Reproductive C. Circulatory D. Digestive

       Ans: C

  1. Which of the options is part of a digestive system? A. Bronchi B. Stomach C. Reproductive D. Lungs

      Ans: B

  1. From the options which is part of the nervous system? A. Brainstem B. Heart C. Lungs D. Nerves

       Ans: D

  1. ……………. Is an example of a human body system? A. Organs B. Cells C. Reproductive D. Large intestine

       Ans: C

  1. Circulatory system moves around the………….? A. Stomach B. Body C. Immune D. Nervous system

      Ans: B