gas exchange in insects

Question 1

explain the tracheal system in insects

Answer 1

• they have a system of tracheal tubes
• spiracles to allow gas to diffuse in and out
• chitin lined tubes called tracheae
• tracheae split into tracheoles
• the end of each tracheole contains a small amount of fluid.

Question 2

what do large insects have to do, but small insects dont

Answer 2

• ventilate
• they rhythmically move their body which sucks air in and pushes air out

Question 3

explain ventilation

Answer 3

• the abdomen contracts and the spiracles open
• air enters through the spiracles
• the abdomen contracts and forces the air out of the open spiracles