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the upper respiratory track
an Olympic size track has how may lines
The epiglottis.
your boogers
Parallel ones
These are called cilia.
Tow parallel lines could be railroad tracks. Each line of the track remains the exact same distance from the other one for the length of the track.
The cells that lines the GI Track into the bloodstream
Tow parallel lines could be railroad tracks. Each line of the track remains the exact same distance from the other one for the length of the track.
Parallel lines.
The full track listing is at http://en.wikipedia.org/wiki/Lines,_Vines_and_Trying_Times