gas exchange in insects

Question 1

what does the tracheal system do in small insects?

Answer 1

diffusion

Question 2

what can spiracles do?

Answer 2

open and close to reduce water loss

Question 3

what is in the tracheal system made of?

Answer 3

spiracles
trachea
tracheoles

Question 3

what does the tracheal system do in large inescts?

Answer 3

ventilation

Question 4

what is at the end of tracheoles?

Answer 4

small amount of fluid close to muscle fibres which gases diffuse into

Question 5

what are tracheae?

Answer 5

branching system of chitin-lined air tubes

Question 6

what does ventilation do?

Answer 6

maintains concentration gradient
movement of air to supply O2 and remove waste products

Question 7

what is ventilation like in insects?

Answer 7

one way air flow through major tracheae
in through thoracic and first 2 abdominal spiracles
out through remaining abdominal spiracles

Question 8

how is air moved in insects?

Answer 8

by contraction and relaxation of muscles
change in volume and pressure of abdomen

Question 9

what happens in inspiration in insects?

Answer 9

thoracic and first 2 abdominal spiracles open
abdomen expands
increase in volume
decrease in pressure
air flows in

Question 10

what happens in expiration of insects?

Answer 10

thoracic and first 2 abdominal spiracles close
other abdominal spiracles open
abdomen contracts
decrease in volume
increase in pressure
air flows out