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====Respiratory System====
 
====Respiratory System====
   −
*Branching [[Trachea - Anatomy & Physiology|trachea]] strengthened by spial thickenings in the walls
+
*Branching [[Trachea - Anatomy & Physiology|trachea]] strengthened by spiral thickenings in the walls
    
*[[Trachea - Anatomy & Physiology|Trachea]] communicate with outside via spiracles
 
*[[Trachea - Anatomy & Physiology|Trachea]] communicate with outside via spiracles
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