Question

With the help of a neat labeled diagram, explain the circulatory system in the cockroach.

Answer 1

Hint: Vascular system with an organ system that circulates blood and transport nutrients.

Complete answer:
The circulatory system is made up of blood vessels that carry blood away from and towards the heart.
The circulatory system carries oxygen, nutrients, and hormones to cells, and removes waste products like carbon dioxide.
Cockroaches being an insect consist of an open circulatory system with blood flowing in blood spaces.
The circulatory system in cockroaches consists of blood, heart, sinuses, and alary muscles.
The blood is slightly orange in color instead of red due to the presence of vitellogenin protein and the absence of respiratory pigment hemolymph.
The cockroach has a 13-chambered heart, elongated contractile, narrow tube lying in the thorax, and abdomen.
The walls of the heart are pericardial sinuses with openings called Ostia which allows the blood flow.
The alary muscles are responsible for the flow of blood into the heart through its contraction and relaxation.

Note: The circulatory system consists of hemocoel which is the body cavity of a cockroach where blood is filled. This liquid is known as hemolymph.
The oxygen is independently supplied through a separate closed type respiratory system.