Question

In cockroach the flow of hemolymph is :
A. Heart --head haemocoel --perivisceral sinus--pericardial sinus--ostia--heart
B. Heart--perivisceral sinus--head haemocoel--pericardial sinus--ostia --heart
C. Heart--head haemocoel--perivisceral sinus--ostia ---heart
D. Heart--ostia--Perivisceral sinus pericardial sinus--head haemocoel--heart

Answer 1

Hint: The circulatory framework comprises veins that drive blood from and towards the heart. Hemolymph is a liquid, similar to blood in vertebrates, that circles the inside of the arthropod body and stays in direct contact with the creature's tissues. It is made out of liquid plasma in which hemolymph cells called hemocytes are suspended.

Complete answer: Steps involved in the flow of haemolymph in cockroach:
The blood streams forward in the heart by the compressions created in its chambers.
At the front, the blood streams into the aorta and enters the sinus of the head.
From the head sinus, the blood streams into the perivisceral and sternai sinuses.
On the withdrawal of the alary muscles, the pericardial septum is pulled down. This expands the volume of the pericardial sinus. Consequently the blood streams from the perivisceral sinus into the pericardial sinus.
Once the alary muscles are unwound, the pericardial septum moves upward. This powers the blood to enter the offices of the heart through the ostia from the pericardial sinus.
In cockroaches, the flow of the hemolymph is
Heart -> head haemocoel -> perivisceral sinus -> pericardial sinus -> ostia -> heart.
So, the correct answer is option (A).

Note: Cockroach being a creepy crawly organism has an open circulatory framework. The heart of the cockroaches is a pulsatile, 13-chambered structure. Its halant openings are called ostia, which are regulated by valves. This dorsal veins of the heart throbs with the assistance of outside compensation muscles. The hemolymph consists of reasonably dull plasma enriched with amino acids, corrosive uric and various distinctive cell types called hemocytes.