insects

Question 1

What can the tracheal fluid do and why?

Answer 1

When tissues are active, the tracheal fluid can be retracted and this increases the surface area so that more oxygen can be absorbed.

Question 2

trachea

Answer 2

chitin. no gas exchange

Question 3

tracheoles

Answer 3

no chitin. larger SA for gas exchange

Question 4

What is a spiracle?

Answer 4

the openings of the tracheal system on the insect to allow air to enter and leave

Question 5

What insects have an expanded tracheal system?

Answer 5

very active insects

Question 6

How does the expanded tracheal system work?

Answer 6

Very active insects have air sacs that are squeezed by action of flight muscles and this ventilates the tracheal system when expansion and contraction is repeated.

Question 7

How does movement of wings alter the volume of the thorax in some insects?

Answer 7

as volume increases, air pressure drops and air is sucked/ pushed into the tracheal system from outside
AND VICE VERSA