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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