The human body is made up of different systems that work together to carry out the
functions needed for life.
One of these necessary functions is breathing. The following systems help move air in
and out of the body. Apply what you've learned about the organization of the human body to
order these systems from the simplest to the most complex.
simplest system
respiratory system, which brings oxygen into the
bloodstream and removes carbon dioxide
lungs, which expand and contract to move air in and out
human, which is made up of multiple interacting organ
systems
epithelial cell, which helps form the lining of the lungs
epithelial tissue, which protects the lungs from
pollutants
most complex system
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