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The Respiratory System

Biology II , Honors
Across
Increases the flow of the surrounding water or air over the respiratory surface.
Helps ventilate our lungs.
The transfer of a substance from a fluid moving in one direction to another fluid moving in an opposite direction.
Extensions or out folding of the body surface specialized for gas exchange.
Where the path for air and food cross
A substance secreted by alveolar that decreases surface tension in the fluid that coats the alveoli.
The alternate inhalation and exhalation of air.
Grape like clusters of air sacs.
Organs that work together.
Down
An extensive system of branching internal tubes with the respiratory surface found at their tips.
An iron-containing pigment that turns red when bound with o2.
Windpipe
Voice box
Internal sacs lined with most epithelium.
Each kind of gas in a mixture accounts for a portion.
A small portion of an organism.
Pair of breathing tubes that branch from the trachea to the lungs.