2 / number of muscles used to power lungs
increase / ribs move up to _______ chest cavity size
decrease / ribs move down to ______ chest cavity size
downward / when diaphragm contracts it pulls chest cavity ______
vibrate / mammals are able to used exhaled air to ______ vocal
stomach muscles / _______ pull air in, and push air out
mammals / All ______ use this type of respiration
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