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Best Answer: The vertical groove between your upper lip and nose is known as the 'philtrum'. It allows for a greater range of lip motions than would otherwise be possible. http://en.wikipedia.org/wiki/Philtrum.
The pleural space is. the area between the lungs and the chest wall. It is normally at subatmospheric. pressure, which keeps the lungs inflated. The normal pleural space has only a. few milliliters of liquid, which helps lubricate the normal to and fro motion of the. lungs during breathing.