Gas exchange in insects

Question 1

Where does air enter insects?

Answer 1

Through pore in their side called spiracles into their trachea

Question 2

How does oxygen move in the trachea?

Answer 2

Down their concentration gradient toward body cells into tracheoles which branch of the trachea

Question 3

How does oxygen diffuse into body cells?

Answer 3

Down the tracheoles and diffuses into the body cells (respiring) because they have thin permeable walls

Question 4

How does carbon dioxide move out of the insect?

Answer 4

Diffuses down its concentration gradient out the cell into tracheole, then out through spiracles

Question 5

What do insects do to move air in an out of spiracles?

Answer 5

Rhythmic abdominal pumping to increase pressure

Question 6

Adaptation of insects to increase gas exchange?

Answer 6

The trachea and tracheoles provide a large surface area for gas exchange
Thin walls = shirt diffusion pathway

Question 7

How do insects reduce water loss?

Answer 7

Waxy cuticles and hairs of body act as waterproofing to reduce evaporation
Closing spiracles using muscles so water doesn’t leave