NEETBiologyAnimal KingdomMCQ+4 / −1
Which one of the following is one of the paths followed by air or O2 during respiration in the adult male Periplaneta americana it enters the animal body?
- ASpiracle in metathorax, trachea, tracheloes, oxygen diffuses into cells
- BMouth, bronchial tube, trachea, oxygen enters cells
- CSpiracles in prothorax, tracheoles, trachea, oxygen diffuses into cells.
- DHypopharynx, mouth, pharynx, trachea, tissues
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Correct answer: A
The respiratory system is well developed in
a cockroach in order to compensate the poorly
developed circulatory system. It consists of tracheae,
tracheoles and spiracles. The main tracheal trunks
open to the exterior on body surface through 10 pairs
of segmentally arranged apertures termed spiracles or stigmata.
Two pairs of spiracles are thoracic, one
between pro and mesothorax and the other between
meso and metathorax. Haemocoel contains a network
of elastic, closed and branching air tubes or tracheae.
The ultimate finer branches of tracheae are called
tracheoles which come in contact with the individual
body cells. The elaborate tracheal system carries
oxygen directly to all the body cells.
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