7.4 gas exchange in insects

Question 1

what are the holes along the abdomen of insects?

Answer 1

Spiracles air enter and leaves from these water is also lost this way

Question 2

to avoid water loss spiracles can be shut by

Answer 2

sphincters

Question 3

Spiracles lead into

Answer 3

tracheae - largest tubes of the insect respiritory system

Question 4

insect tracheae branch into

Answer 4

tracheoles wich have thin permeable walls and go into individual cells and contain tracheal fluid for O2 to dissolve in

Question 5

Trachea of an insect is lined with….

Answer 5

chitin-impermeable to gas so little exchange occurs there

Question 6

ventilation in most insects is controlled by

Answer 6

opening and closing spiracles and diffusion does the rest

Question 7

for some insects eg. beetles, grasshoppers,bees,files with a higher energy demand they incresase ventilation by

Answer 7

• mechanical ventilation a rythmic abdominal movments to change the volume of the bodies so air is forced in and out of spiracles
• flying wings can also pump thoraxes