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Question -

Mention briefiy about the circulatory system of earthworm.



Answer -

Circulatory system of earthworm –

  1. Earthworm consists of a closed circulatory system, which consists of heart, blood vessels and blood.
  2. Blood glands are present into the 4th, 5th and 6“ segments of the body, they produce blood cells and haemoglobin which remains dissolved in plasma.
  3. 7th, 9th, 12th and 13th segments contains four pairs of pulsatile hearts.
  4. Blood circulates in one direction, which is maintained by contractions of the heart.
  5. Alimentary canal, nerve cord and body wall gets blood by smaller blood vessels.
  6. Blood cells are phagocytic in nature.

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