In
a new born baby,the head accounts for one-quarter of the
total body length ;by adulthood , the proportion has reduced to
one-eighth.The contained the body's main sense
organs.:Eyes,ears,olfactory nerves, that detect smells,and the
taste buds of the tongue .Signals from from these organs pass
in the body's great coordination centre ;the brain .housed in
the protective, bony dome of the skull.Hair on the head insulates
against heat loss,and adult males also grow thick facial
hair.The face has three important openings.two nostrils through
which air passes,and the mouth.Which takes in nourishment and
form speech.Although all heads are basically similar,
differences in size,shape,and colour produce an infinite
variety of appearances.
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