It is observed that atmospheric pressure exerts roughly 14.7 lbs of force per square inch on an average-sized human, yet the individual experiences no discomfort. Why does this occur__________?
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Answer: A. An equal and opposite pressure acts from inside
Explanation
An equal and opposite internal pressure acts outward from inside the human body to maintain equilibrium. Internal fluids and dissolved gases exert outward pressure that perfectly balances the external atmospheric weight. This internal counter-pressure prevents the external atmosphere from crushing the average-sized human frame. Atmospheric pressure arises from the gravitational weight of Earth air molecules pressing down on surfaces. Fluid pressure exists within all living biological systems, including human blood vessels and tissue fluids. Homeostatic mechanisms within our bodies constantly regulate internal fluid pressures to ensure cellular stability.
Deep sea divers and mountain climbers experience extreme pressure changes that challenge internal bodily equilibrium. Spacesuits are engineered to provide artificial internal pressure when astronauts work in a vacuum environment. Understanding fluid balance helps medical professionals treat patients suffering from dangerous blood pressure fluctuations. The height of a man has no direct mechanical effect on balancing external atmospheric pressure forces. Gravity pulls downward toward Earth and cannot counteract the crushing weight of the atmosphere above. Earth pulling a person upward is physically incorrect since gravity exerts a downward directed force.
- Subject
- Everyday Science
- Category
- Everyday Science
- Topic
- —
- Difficulty
- medium
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