Trachea Cartridge

status       student
grade        6-8
location     NY

Question -   why does the trachea have cartilage but the
esophagus does not?
 ---------------------------------------
It's pretty important that the trachea stay open.  The esophagus has
elastic tissue that allows it to expand many times greater than its
size.  It is protected between the back of the trachea and the front
of the spine.

vanhoeck
====================================================================