Question

Heart of a cockroach has_____ compartments.
A. 2
B. 3
C. 4
D. 13

Answer 1

Hint: Cockroaches have multi-chambered hearts that are shaped like tubes which are much more resistant to failure than human hearts.
But instead of shaping the heart as a tube, they've created the chambers in a series of concentric spheres like an onion.

Complete answer:
 In order to solve this question we need to know more about the cockroaches.
A cockroach belongs to the class insecta of phylum Arthropoda.
They are brown or black bodied animals.
The size ranges from 0.6-7.6 cm and consist of a long antenna, legs and flat extension of the upper body wall that conceals the head.

The body of cockroach is segmented and divisible into three distinct regions:
1. Head
2. Thorax
3. Abdomen

The whole body of the cockroach is covered by the hard chitinous exoskeleton which is brown in colour.
To solve the above question, let’s discuss the blood vascular system of cockroaches.
Circulatory system of cockroaches is an open type.
Blood vessels in cockroaches are poorly developed and they open up into space known as hemocoel.

Heart of cockroach consists of an elongated muscular tube lying along the dorsal line of the thorax and abdomen.
It is transformed into funnel shaped chambers with Ostia.
Cockroach has a 13 chambered tubular heart.
Oxygenated blood enters each chamber through a pair of a slit like openings known as Ostia.
The first chamber opens into aorta which further opens into head sinuses.

So, the correct option is option d. 13 compartments.

Note: The heart is the key organ for blood circulation and the double circulation is an efficient way of circulation as it provides an effective way of circulation.
 Double circulation follows the main pathways, one for oxygenated blood and another for deoxygenated blood. The majority of mammals, including humans utilize a double circulatory system.
Double circulation includes systemic circulation and pulmonary circulation.