Question

Describe respiratory system of cockroach.

Answer 1

Cockroach has a tracheal system for respiration which will consist of air tubes or tracheae which are well connected to outside by lateral starting holes called as $\textbf{spiracles}$. The insect is consisting of 10 pairs of such spiracles containing Eight $\textbf{Abdominal Spiracles}$ and two $\textbf{Thoracic Spiracles}$.

The First thoracic spiracles have been mentioned as $\textbf{Mesothoracic Spiracles}$, and are one of the largest in this organism. First pair of Abdominal Spiracles are borne dorso-laterally over the first Abdominal tergum. The remaining are mostly occurring on the successive pleurae. Each Spiracle has a specific valve or a valvular opening that are operated by special sphincter type muscular structures (also found in humans).

A Spiracle will lead to another pocket-shaped atria (plural, atrium) or a chamber containing $\textbf{Bristles}$ for filtration of air and another set of Hair or $\textbf{Sensory Hair}$ for removal and/or deciphering the concentration levels of Carbon Dioxides (CO$_{2}$). Atria or Atrium will lead into a lateral longitudinal tracheal trunk.

Tracheae are silvery white (in color) respiratory tubes which are classified as ectodermal and are thoroughly developed via invagination of the integument. Tracheal system of a Cockroach will consist three pairs of longitudinal trunks, namely, lateral trunk, dorsal trunk and ventral trunk. They are connected by a number of commissures and branch of tracheae that are running in different directions.

Tracheae are constantly dividing and re-dividing which finally forms very fine tubules called as $\textbf{Tracheoles}$. The Tracheal walls have single layered syncytial epidermal lining, a thin cuticle and a number of chitinuous ring-like structures called $\textbf{taenidia}$, the latter are having a special role (same as for humans) for controlling the collapsing of the Tracheal tubes. Basically, strictly speaking of Tracheoles, they are devoid of those chitinuous rings and are usually branched and terminated within those tissues. A small tiny amount of body fluid is more commonly found in the terminal parts of Tracheoles.

$\boxed{Mechanism \: \: of \: \: Respiratory \: \: system \ \ in \: \: Cockroaches}$

When a Cockroach is undergoing a resting phase only some of the spiracles are limited to opening. Oxygen from outside will evenly diffuse into the tracheae and will pass down into tissue fluid which is containing the terminal part of Tracheoles, from here the oxygen will enter the cells. Carbon dioxide produced by those cells are going to get diffused in a opposite direction, tiny amounts of Carbon Dioxide can diffuse directly by the body. During this activity of the Cockroach it will perform $\textbf{Ventilation Movements}$ further which does the alternation, expansion and contraction of the body. All the following spiracles are going to get opened during the phase of expansion of the body. Inspiration only occurs whereby some free air form outside is suc.ked into the Tracheal system and reaches at the Tracheole ends or terminating into it. Here, exchange of gases occur between some inspired air (oxygen) and releases or expired air (carbon dioxide) from the tissue cells. As the Carbon dioxide Concentration is increased in the Tracheal system, the body of the Cockroach will contract and expire or push out Carbon Dioxide enriched substrates into the atmosphere, outside the body, this process is called or known as $\textbf{Expiration}$

Answer 2

Answer :-

=) In cockroach , respiration happens through a little openings on the sides of its body called spiracles. At the point when the air enters the respiratory arrangement of a cockroach through these outer openings, spiracles go about as solid valves, prompting the inside respiratory framework. The respiratory organ of cockroach is known as tracheae.

The tracheae works to balance the weight inside the framework. As the oxygenated air from the climate goes into the cockroach's body through the spiracles into the tracheal cylinders, it enters into the diverse cells and tissues of the body, where the oxygen gas is used to discharge vitality.