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  •  Which of the following spiracles remain open throughout the respiration?Option: 1 1st and 10thOpt

 Which of the following spiracles remain open throughout the respiration?

Option: 1

1st and 10th


Option: 2

1st and 4th


Option: 3

1st and 3rd


Option: 4

1st and 2nd

 


Answers (1)

best_answer

Respiratory System and Excretory System of Cockroach

Respiratory system

  • Respiratory system of cockroaches includes a system of tubes or tracheae.
  • These tracheae receive air through 10 pairs of small openings called spiracles.
  • The spiracles are located on the lateral sides of the body of the insect.
  • Each trachea divides into thin branches called tracheoles which carry oxygen from the air to all the parts of the body.
  • The openings of the spiracles are regulated by the sphincters. 
  • The exchange of gases takes place at the tracheoles by diffusion
  • Out of the ten, the 1st and 3rd pair of spiracles always remain open, while the rest of them open only during inspiration. 
  • The process of respiration is associated with the contraction and relaxation of abdominal muscles called tergo-sternal muscle.
     

Out of the ten, the 1st and 3rd pair of spiracles always remain open, while the rest of them open only during inspiration.

Posted by

seema garhwal

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