Insect Exchange

Question 1

Exoskeleton

Answer 1

less permeable
chiton (waxy)
waterproof

Question 2

where do insects live?

Answer 2

On land

Question 3

Why is this bad?

Answer 3

they can become easily dehydrated through water loss

Question 4

Adapted gas exchage surface?

Answer 4

for gas exchange and water loss

Question 5

Hairs

Answer 5

trap moist air outside the insect

Question 6

Spiracles

Answer 6

open and close

Question 7

Cuticle

Answer 7

thick
waxy
waterproof

Question 8

SA:V ratio?

Answer 8

relatively small SA:V ration

Question 9

Segmented Body

Answer 9

each segment has spiracles

Question 10

Gas movement in Spiracles?

Answer 10

gases move randomly in and out of spiracles by diffusion

Question 11

Trachea

Answer 11

big tube

Question 12

Tracheoles

Answer 12

small tube

Question 13

Insects gas exchange pathway

Answer 13

spiracles 
trachea 
strengthening rings 
tracheoles 
muscle

Question 14

large SA:V ratio

Answer 14

increases rate of exchange
small but waterproof
spiracles increase surface exposed to environment
many small branching tracheoles

Question 15

Short diffusion path

Answer 15

tracheoles in direct contact with respiring tissues

length of trachea/tracheoles limited by diffusion speed

Question 16

Movement of environmental medium

Answer 16

maintain concentration gradient
ventilation movements
muscles contrations refresh air within tracheoles

Question 17

Movement of internal medium

Answer 17

not applicable for gas exchange in insects

Question 18

Minimising water loss

Answer 18

waterproof covering spiracles closing hair