Respiratory System Crossword

A series of organs responsible for taking in oxygen and expelling carbon dioxide.
The organ that does the exchange of gases as we breathe
This gas is 28% of the air we breathe
The many tiny air sacs of the lungs which allow for rapid gaseous exchange.
This gas is 71% of the air we breathe
The major air passages of the lungs which diverge from the windpipe.
The hollow muscular organ forming an air passage to the lungs and holding the vocal cords in humans and other mammals
A large membranous tube reinforced by rings of cartilage, extending from the larynx to the bronchial tubes and conveying air to and from the lungs
The membrane-lined cavity behind the nose and mouth, connecting them to the esophagus.
A dome-shaped muscular partition separating the thorax from the abdomen in mammals. It plays a major role in breathing, as its contraction increases the volume of the thorax and so inflates the lungs
Either of two external openings of the nasal cavity in vertebrates that admit air to the lungs