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The Respiratory System

Across
The tiny air sacs where the gases are exchanged.
These are like tiny hairs that act as a filter to keep dirt,etc., from entering the lungs.
The gas that you exhale
The main organ of the respiratory system
A slimy substance that helps to catch dirt from entering your lungs.
Down
These surround the alveoli.
The windpipe
The smaller branches of the "bronchial tree".
In the lungs, the trachea branches off into two pathways called the __________.
The gas that you inhale