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The uterus keeps the trachea from collapsing in a fetal pig.
It prevents you from collapsing like a blob of jello.
Its cytoplasm.
cytoplasm
hydrostatic
Transpulmonary pressure
Dynamic equilibrium.
The circulation system has the blood go around your body. You can say that the blood has your food go around your body, which keeps your bones strong.
cytoskeleton
gravity maybe?
The trachea has a series of cartilage rings that prevent it from collapsing.
Like a camera has a case, the eye is surrounded by tissues and are filled with fluid called "humours" to keep it from collapsing.