The respiratory system

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Clues

gases diffuse across body surface
inhalation and exhalation
respiratory protein of red blood cells
entrance to larynx
muscle between the thoracic and abdominal cavities
greater surface area and larger partial pressure gradient the faster the diffusion rate
opening between two vocal cords
windpipe
used by invertebrates, tubes start at openings in integument and dead end in body tissues
volume of air flowing into or out of the lungs
thick fold of larynx, helps in production of sound waves
outpouching of respiratory bronchiole
airway, branches from tracheas and leads to the lungs
respiratory surfaces in shape of sacs