Question

Correct statement about circulatory system of cockroach
A) In has close type of circulatory system
B) It has a complicated type of circulatory system
C) It has 13 chamber heart with a pair of ostia in each chamber
D) It takes place without participation of tissues

Answer 1

The scientific name of cockroach is Periplaneta americana and is an example of a pest which is generally found in damp and unhygienic places. It belongs to the phylum Arthropoda.

Complete answer:
Let's discuss the option and find the correct answer.
Option A: A cockroach has an open circulatory system and it is also known as the lacunar circulatory system. In this where blood flows under low pressure since it falls in cavities of the body and it does not circulate within blood vessels. Therefore, this is the incorrect option.
Option B: The cockroach has an open circulatory system. The blood flows through the body cavity. The c system consists of a heart, anterior aorta, and a system of ill-defined blood spaces and is known as sinuses. Therefore, this is the incorrect option.
Option C: Body cavity of the cockroach is known as a hemocoel. It remains filled with blood. The heart is present along the mid-dorsal line of the body. The heart of a cockroach is an elongated muscular tube. It consists of 13 segmentally arranged funnel-shaped chambers. A pair of ostia is present in between 2 chambers. The heart receives oxygenated blood from the dorsal sinus through ostia. It extends from the tip of the head up to the abdominal end. The alary muscles hold the heart in position. Therefore, this is the correct option.
Option D: In the circulatory system of cockroaches, only blood is there. Presence of aorta and veins is not seen. Therefore, this is the incorrect option.

Therefore, the correct statement is (C) It has a 13 chamber heart with a pair of ostia in each chamber.

Note: In Cockroach, the heart is arranged mid-dorsally. It is pulsatile and consists of 13 segmentally arranged funnel-shaped chambers. There are 10 units or chambers that are arranged abdominally and 3 thoracic units.