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A "weightless" astronaut in an orbiting space vehicle is
Chest Wall
The structures that enclose the chest cavity, including the rib cage, muscles, and skin, providing protection and support.
Fluid
A substance that flows freely, such as a liquid or gas, adjusting its shape to fit its container.
Eupnea
Normal, unlabored breathing.
Breathing Difficulty
A sensation of not being able to breathe well or feeling suffocated, which can be a symptom of various medical conditions.
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