B5 – transportation 2 – Transport in Humans



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B5 – TRANSPORTATION

5.2 – Transport in Humans
1. Describe the circulatory system as a system of tubes with a pump and valves to ensure one-way flow of blood.


2. Describe double circulation in terms of a low pressure circulation to the lungs and a high pressure circulation to the body tissues and relate these differences to the different functions of the two circuits.



  • Blood passes through the heart twice for each complete circulation of the body;

  • The right side of the heart collects deoxygenated blood from the body and pumps it to the lungs;

  • Thus there is a low pressure circulation in the lungs;

  • The left side collects oxygenated blood from the lungs and pumps it to the body;

  • Thus there is a high pressure circulation to the body tissues.

  • The double circulatory system helps to maintain blood pressure, making circulation efficient.




  1. Describe the structure of the heart, including the muscular wall and septum, atria, ventricles, valves and associated blood vessels.


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