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Which of the following is true w.r.t the circulatory system of the cockroach?
Option: 1
It is of open type.
Option: 2
It has well developed blood vessels.
Option: 3
It is regulated by a neural and tubular heart.
Option: 4
It is made up of cells and plasma containing hemoglobin
Answers (1)
Circulatory System of Cockroach
- The circulatory system of cockroaches is the open type with blood flowing in open spaces.
- Blood flows freely in the body cavity which is known as hemocoel.
- Blood vessels are poorly developed
- The hemocoel is divided into sinuses or blood spaces.
- Visceral organs located in the hemocoel are bathed in blood (hemolymph) which is composed of colorless plasma and hemocytes.
Heart
- The heart of the cockroach lies along the mid-dorsal line of the thorax and abdomen.
- It is an elongated muscular tube consisting of 13 funnel-shaped contractile chambers.
- Each contractile chamber of the heart contains inhalant openings called ostia on either side
- Blood from the sinuses enters the heart through ostia and is pumped anteriorly to the sinuses again.
- The pumping of blood is brought about by the contraction and relaxation of fan-shaped paired muscles called alary muscles.
- Blood vessels are poorly developed in cockroach. The hemoglobin is not present.
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