GAS EXCHANGE IN INSECTS by STB7n70v

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									                                                                   GAS EXCHANGE IN INSECTS



                                                                   Introduction

                                                                   All insects are aerobic organisms -- they must obtain oxygen
                                                                   (O2) from their environment in order to survive. They use the
                                                                   same metabolic reactions as other animals (glycolysis, Kreb's
                                                                   cycle, and the electron transport system) to convert nutrients
                                                                   (e.g. sugars) into the chemical bond energy of ATP. The
                                                                   respiratory system is responsible for delivering sufficient
                                                                   oxygen to all cells of the body and for removing carbon
                                                                   dioxide (CO2) that is produced as a waste product of cellular
                                                                   respiration.


                                                               Task
For each of the characteristics in the table research and discuss the “problems” that this gives the insect and then research
and explain structures/systems/functions that have evolved to meet the physiological “demands/challenges” and explain
how they function in order for insects to successfully meet these challenges.


Useful web sites
http://www.cals.ncsu.edu/course/ent425/tutorial/circulatory.html
http://entochem.tamu.edu/insect_structure-function/index.html
Characteristic              “Problems”   Structures   Functions   Systems
No lungs




Exoskeleton impermeable
to water and gas



Fick’s Law



Open Circulatory System



Living in dry conditions



Intense activity (flying)

								
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