External respiration system Using the lungs and a series of air sacs To communicate with body parts 3.________
4.____sac system Bigger than the lungs
Taking up a 5.______part of the chest and belly area
6.______of bird breathing A stream of air
▲going through lungs without 7.______
▲being channeled through the complex system of air sacs and through 8.________bones
▲being
9.______forward through the lungs again,then through more air sacs
▲ 10.______in the windpipe and are expelled from the body 答案:1.water 2.respiration 3.directly/straight 4.Air 5.small 6.Process 7.stopping/stop 8.hollow 9.channeled 10.completing/finishing/ stopping
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