Turn on thread page Beta
    • Thread Starter
    Offline

    0
    ReputationRep:
    I'm doing AQA A and all i know on this subject is that insects are covered by a waterproof cuticle with a layer of wax on its surface. Spiracles connect air to passages caled trachea. These brach into small dead end tracheoles where gaseous exchange takes place. O2 and CO2 diffuse rapidly through air in the tracheal system. Tracheoles have thin walls and together have a large surface area relative to the volume of the insect.
    To me what i know seems a bit basic, is there anything else i should know?
    Offline

    1
    ReputationRep:
    This stuff is all basic - what you know is good enough. Its like all the alveoli stuff too - a bit of common sense and you'll be fine.
    • Thread Starter
    Offline

    0
    ReputationRep:
    There was something about the tracheoles' ends being filled with liquid but i cant remember what that was all about
    Offline

    2
    ReputationRep:
    the tracheoles extend to just about every cell in the insect body. they are always moist to allow diffusion of oxygen in solution. when a tip fills with fluid the air is unable to reach the very end, so oxygen cannot diffuse into that cell. it is thought that insects are able to control which cells are unable to receive oxygen in this way.
    the air originally comes through openings in the exoskeleton called spiracles and moves down the tracheal trunk into branches called tracheal tubes, then finally into the tracheoles.
 
 
 
Turn on thread page Beta
Updated: June 14, 2005
The home of Results and Clearing

2,609

people online now

1,567,000

students helped last year

University open days

  1. SAE Institute
    Animation, Audio, Film, Games, Music, Business, Web Further education
    Thu, 16 Aug '18
  2. Bournemouth University
    Clearing Open Day Undergraduate
    Fri, 17 Aug '18
  3. University of Bolton
    Undergraduate Open Day Undergraduate
    Fri, 17 Aug '18
Poll
Do you want your parents to be with you when you collect your A-level results?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.