gas exchange in insects Flashcards

1
Q

what does the tracheal system do in small insects?

A

diffusion

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2
Q

what can spiracles do?

A

open and close to reduce water loss

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3
Q

what is in the tracheal system made of?

A

spiracles
trachea
tracheoles

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3
Q

what does the tracheal system do in large inescts?

A

ventilation

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4
Q

what is at the end of tracheoles?

A

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

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5
Q

what are tracheae?

A

branching system of chitin-lined air tubes

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6
Q

what does ventilation do?

A

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

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7
Q

what is ventilation like in insects?

A

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

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8
Q

how is air moved in insects?

A

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

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9
Q

what happens in inspiration in insects?

A

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

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10
Q

what happens in expiration of insects?

A

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

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