Question

Alary muscles of cockroach are associated or connected with
(a) Trachea
(b) Heart
(c) Legs
(d) Alimentary canal

Answer 1

Hint: Main organ in the physiological system which helps in the transportation of digested food, hormones, etc. from one part of the body to another. In cockroaches, it is present in 13 segments beneath the terga of the thorax.

Complete answer:
In cockroaches, transportation of digested food, hormones, etc. from one part to another part of the body is done by the circulatory system. Cockroach’s circulatory system has three parts: hemocoel, heart, and blood. Hemocoel of cockroach is divided into two dorsal diaphragms and a central diaphragm. Both of them contain valvular pores. Paired triangular muscles that are arranged in series are called alary muscles associated or connected with the heart. One pair of these muscles are situated on the lateral sides of the body in each segment.

Additional information:
- Periplaneta belongs to the largest class Insecta of phylum Arthropoda, the largest phylum in the animal kingdom.
- An open type of circulatory system is seen where blood or hemolymph flows freely within the body cavity or hemocoel.
- It contains poorly developed blood vessels that open into spaces. Visceral organs are located in the hemocoel and are bathed in the hemolymph.
- Alary muscles present in each segment are attached to the pericardial septum.
- The heart lies in the dorsal sinus also called pericardial hemocoel. It is associated or connected with alary muscles

So, the correct answer is ‘Heart’

Note:
-A 13 chambered heart is seen in cockroaches which is a long, muscular, contractile tube found along beneath the terga of the thorax.
-Out of 13 chambers, 3 chambers are present in the thorax, and the remaining 10 chambers are found in the abdomen.
-Ostia is the pair of small apertures found on either side of the heart except for the last chamber.