MORPHOLOGY OF ANIMALS 



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Fig. 15. Respiratory and Sensory Organs of Grasshopper. A, Surface view, showing head 

 <A), thorax (i) and abdomen (a) ; the head bears antennae {an), eyes (e) and mouth palps 

 (^p) ; the thorax bears 3 pairs of legs and 2 pairs of wings (here removed) ; the abdomen 

 consists of 7 segments and a terminal portion, each thoracic and abdominal segment bears 

 a spiracle (1-10), and the last thoracic segment has a tympanum or ear drum (0- (After 

 Hatschek). 



A, Internal Air Sacs {as) and Tracheae ; c, cephalic trachea, d, dorsal trachea ; st, stigmatal 

 trachea into which spiracles (4-10) open ; v, ventral trachea. (After Packard). 



plied with blood vessels. The exchange of gases here takes 

 place between the blood and the air within the lung, and 

 in most vertebrates the oxygen-carrying capacity of the 

 blood is increased by the presence of haemoglobin (the 

 coloring matter of red blood-corpuscles) which enters 

 into a loose chemical combination with oxygen. 



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