SCI/P/4: RESPIRATION

This unit is about respiration and blood circulation.

RESPIRATION 

Respiration is the way the body uses oxygen to break down food in order to produce energy.

Oxygen is used for respiration

Respiration takes place in the lungs.

Respiratory organs

  • The lungs.
  • The nose
  • Wind pipe (trachea)

The process of respiration

  • The air enters into the body through the nose.
  • The air passes through the wind pipe to the lungs.
  • In the lungs oxygen joins the blood stream
  • The digested food in the stream is then broken down by the oxygen.

NB; breathing is the movement of air in and out of the nose.

Importance of respiration.

  • It provides energy to the body
  • It helps to remove the waste carbon dioxide from the body.

WATCH THE VIDEO BELOW TO LEARN ABOUT THE RESPIRATORY SYSTEM

BLOOD CIRCULATION

  • Blood circulation is the movement of blood throughout the body.
  • Blood moves through blood vessels in the body.

Organs of blood circulation.

  • The heart
  • The lungs
  • The blood vessels

The process of blood circulation.

    • The blood is pumped from the heart to the lungs to pick oxygen.
    • The blood flows back to the heart
  • The blood is then pumped to all other parts of the body through the blood vessels
  • The blood without oxygen flows back to the heart.

Importance of blood circulation

  • It transports food nutrients throughout the body.
  • It transports waste products to their excretory organs.
  • It helps to distributes heat in the body.

WATCH THE VIDEO BELOW TO UNDERSTAND MORE ABOUT BLOOD CIRCULATORY

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