Sherwood: Chapter 11

Objective:  The insect tracheal system relies on the rapid diffusion of gases in air and avoids the necessity of transporting gases in the blood.

1.  Tracheal system of air breathing insects
        a.  spiracles
        b.  water conservation
        c.   ventillation of trachea
2.  Aquatic insects
        a.  tracheal gill
        b.  physical gill
        c.  plastron
3.  Gas transfer in bird eggs
4.  Swim bladders in some aquatic animals
        a.  rete mirabile