cytoplasm
The cytoskeleton keeps the membrane from collapsing. A cytoskeleton is a skeleton and a muscle. The cytoskeleton function in a plant and animals.
The uterus keeps the trachea from collapsing in a fetal pig.
Plasmolysis is the reason because it always has water to keep it full.
hydrostatic
Transpulmonary pressure
Dynamic equilibrium.
gravity maybe?
cytoskeleton
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.
the cytoskeleton is a web of proteins in the cytoplasm.The cytoskeleton acts as a muscle and a skeleton . It keeps the cells membranes from collapsing.