Thursday, November 10, 2011

[Science Form 3] About Blood

The transport system in humans is called the circulatory system, which is made up of heart and blood vessels.

The functions of the blood circulatory system are to:
  • supply oxygen to all body cells and eliminate carbon dioxide,
  • transport waste products

Structure of the heart

Oxygen-rich blood (red color)
Oxygen-poor blood (blue color)
  • AO = Aorta
  • LA = Left atrium
  • LV = Left ventricle
  • PA = Pulmonary artery
  • RA = Right atrium
  • RV = Right ventricle

The heart is a muscular structure that contracts in a rhythmic pattern to pump blood. It si the size of your fist and has four chambers:
  • right atrium
  • right ventricle
  • left atrium
  • left ventricle

The space in the atrium is smaller than that in the ventricle. The wall of the ventricle is thicker and stronger than that of the atrium.

Valve TRICUSPID - Prevents blood in the right ventricle from flowing back to the right atrium.

Valve BICUSPID - Prevents blood leaving the heart from flowing back.


  1. larh nota scince dlm blog cikgu Naza nih....mudah faham dan ingat...

  2. cikgu, sikit nye nota ..... ?

  3. HA wah best nota dlm cikgu Naza nih mudah hafal. khalish dan ainumul kalah bar yehh


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