292 BIOLOGY AND HUMAN LIFE 



Head Appendages 



Skeleton (skull and jaw) Number and location 



Brain Characteristic structure 



Special sense organs Skeleton ; muscles ; covering 



Eyes ; ears ; smelling area ; 



taste area ; balancing organs 

 Mouth 



Connection with food pipe 

 Connection with breathing organs 

 (Nose) 

 Tongue 

 Teeth 

 3. Structure of frog — a typical amphibian (batrachian) 

 General plan 

 Characteristics of skin 



Perfectly bald ; slimy ; pigmentation • 

 Characteristics of head 



Flat ; no neck ; protruding eyes 

 Nostrils leading into mouth ; can be closed 

 Wide mouth ; tongue : teeth (on upper jaw) 

 Eardrums 

 Characteristics of limbs 



Adaptations for locomotion : on land ; in water 

 Internal organs and arrangement 

 Digestive organs 

 Gullet 

 Stomach 

 Intestines 



Glands : gastric ; liver ; pancreas 

 Respiratory organs : lungs ; bronchial tubes 

 Circulatory organs : heart (three chambers) ; arteries ; veins ; 



capillaries (spleen) 

 Excretory organs : kidneys ; bladder 

 Reproductive organs : ovaries with tubes ; spermaries with 



tubes 

 Nervous system 

 Brain 



Spinal cord and connections 



(Nerve endings in skin, special sense organs, muscles, and 

 viscera) 



