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Which of the following is not true regarding the blood vascular system of cockroach ?

Which of the following is not true regarding the blood vascular system of cockroach ? Correct Answer Pulsatile vesicles absent

Key Points
  • Cockroach is an insect that belongs to the phylum Arthropoda.
  • The blood vascular system of cockroaches is of open-type.
  • This means that blood flows through open cavities and not through vessels.

Important Points

The given statements can be analyzed as follows:

  • Its blood is called hemolymph: TRUE​
    • Blood comes in direct contact with the tissues while flowing through the hemocoel.
    • ​Thus blood acts as both blood as well as lymph and hence called 'hemolymph'.
  • Heart has 13 chambers: TRUE
    • ​The heart is a narrow, elongated tube lying along the mid-dorsal line of thorax and abdomen.
    • It has 13 funnel-shaped chambers which are segmentally arranged.
  • Respiratory pigment absent in blood: TRUE
    • ​The hemolymph is colorless due to lack of respiratory pigments.
    • Thus, it does not take part in respiration.
    • It consists of suspended nucleated cells called hemocytes.
  • Pulsatile vesicles absent: NOT TRUE
    • ​Pulsatile vesicles are also known as lymphatic hearts.
    • They are specialized structures for circulating coelomic fluid.
    • Cockroaches have an accessory pulsatile vesicle at the base of each antenna.
    • It is responsible for supplying hemolymph to certain appendages.

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