A waxy coat called ( cuticle)
the structure of the trachea is much like that of a penis. The tube is called the shaft and the atoms apple is like the scrotium harvesting the testes.
the liver is part of your digestive system it contains an enzyme called milliphosiphis. it is the tube that is connected to the anus.
The tube foot
The tube foot
The space within a tube-like structure is called a lumen. Parts of the body with lumens include veins and arteries.
It's called a nerve.
from a tube-like structure
The structure in an echinoderm that is a bulb like sac and pushes what is called the ampulla. It is connected to the radial canal of the water-vascular system. Each ampulla controls tube feet. The tube feet can extend when water pressure is increased by the ampulla being squeezed. :)
Lava tubes.
That tube is called as urethra.
TracheaPlenumManifoldThe trachea is the airway in the respiratory system sometimes called the windpipe.
bronchi is a tube like structure. It carries air to lungs.