How many chambers in the heart of cockroach?

The heart of the cockroach has 13 chambers.

Cockroaches are pests that thrive in filthy, wet conditions. They are dark brown insects and are classified as arthropods, Blattidae, and Insecta. Cockroaches can even be found in the Arctic because they can endure extremely low temperatures. Some species can survive temperatures of -122 °C (-188 °F) by producing an antifreeze consisting of glycerol. Out of 4,600 species of cockroaches, around 30 are involved with human surroundings. Some of these species are well-known pests.

Cockroaches' hearts are multi-chambered and are significantly more resistant to failure than human hearts. Instead of building the heart as a tube, the chambers are shaped like an onion with concentric spheres. Each chamber represents a single heart. Each chamber gets oxygenated blood via a pair of ostia openings. The three linked chambers of the cockroach are the dorsal/pericardial sinus, the middle/perivisceral sinus, and the ventral/perineural sinus. The first chamber connects to the aorta, which connects to the head sinuses, which further connect to the pericardial sinus via the perineural and perivisceral sinuses. Valves protect each chamber's openings into other chambers.Each chamber of the heart receives oxygenated blood from the dorsal sinus through a pair of ostia, or valve openings. In cockroaches, alary muscles are crucial for blood circulation. The terga is connected to the pointy ends of the alary muscles.

The heart beats in a posteroanterior direction 100–120 times per minute, forcing blood to flow in the same direction. A nerve signal initiates heartbeats in the neurogenic heart, which is seen in most arthropods, such as cockroaches. Cockroach blood is colourless, devoid of haemoglobin, and sometimes referred to as hemolymph. Blood comprises a transparent liquid called plasma and many corpuscles called hemocytes. Blood corpuscles are divided into circular pro-leukocytes and amoeboid phagocytes.