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Respiratory System

Across
A measure of the relative amount of gas in a mixture
Maximum volume of air that a mammal can inhale &exhale with each breath
Windpipe
A breathing system in which air is pulled into the lungs
A short cellular appendage specialized for locomotion formed from a core 9 outer doublet microtubles & 2 single microtubles covered by the cell's plasma membrane
A substance secreted by alveoli that decreases surface tension in the fluid that coats the alveoli
Extensions or foldings of the body surface in aquatic animals
Down
Transfer of substance or heat between 2 fluids flowing in opposite directions
Brain center that directs activity of organs involved in breathing
One of a pair of bonds of elastic tissues in the larynx; produces sound
In Insects, extensive system of branching internal tubes with the respiratory surfaces found at their tips.
Infolded respiratory surface of terrestrial veterbrates that connects to the atmosphere by narrow tubes
One of millions of tiny dead sacs within the vertebrate lungs where gas exchange occurs
A thin breathing tube that branches from a branch within a lung
Sheet of muscle that separates the chest cavity from the abdominal cavity in mammals.