Question

What is haemocoel?

Answer 1

Hint: Haemocoel is the body cavity of many invertebrates which includes arthropods and molluscs. It is found where the hemolymph circulates. Haemocoel is the fluid found in the circulatory system of phylum arthropoda.

Complete answer:
Haemocoel is the body cavity of many invertebrates which includes arthropods and molluscs. It is found where the hemolymph circulates. It is developed from part of the blood system. It functions as a circulatory system in insects like grasshoppers.

Insects do not have arrangement of blood vessel as found in mammals so instead of these blood vessels, insects have a cavity which is full of insect blood which is known as hemolymph and their organs are suspended in this cavity which means that the organs do not have a particular supply of blood but these organs are suspended in the blood and receives the nutrients as the blood washed around the organs.

In other words, you can say haemocoel is the body cavity around the viscera which contains blood and that is called the haemocoel. A true coelom is reduced to cavities in the reproduction.

Additional information:
Hemolymph is a complex tissue and it is composed of cells which are suspended in a solution of salt and organic molecules that include high concentration of proteins. It is a fluid which is analogous to the blood in vertebrates as this hemolymph circulates in the interior of arthropods body. In the fluid plasma haemocytes are suspended which are hemolymph cells.

In the grasshopper, the heart pumps hemolymph into the sinuses of the haemocoel cavity where exchanges of materials take place and the amount of hemolymph needed for this system is to keep minimum for reduction in the size of body cavity. This cavity haemocoel is divided into chambers which are called sinuses.

Note: Arthropods and molluscs (invertebrates) have a body cavity which is developed from the part of the blood system which functions as a circulatory system in insects like grasshoppers. Due to absence of blood vessels in insects they have hemolymph which is insect blood.