Stent
It is a tunnel-like opening at the vessel's stern, through which the propeller or tail shaft passes, in order to connect the propeller to the engine.
An orifice is an opening or hole, whereas a lumen refers to the inner space or cavity within a tubular structure such as a blood vessel or intestine. In simpler terms, an orifice is an opening, while a lumen is the space inside that opening.
Animals whose basic body plan can be described as a tube within a tube are the bilaterians, including insects, mammals, reptiles, and birds. This means they have a central digestive tube (gut) within a central nervous system. This body plan allows for efficient organization of internal organs and specialization of body regions.
The duct of a lumen is a passageway that allows substances to flow through a hollow structure, such as in the case of the digestive or excretory systems. The lumen refers to the central space within a tube or vessel where substances pass through. Collectively, the duct and lumen work together to transport materials within the body.
A vessel is a ship or boat, or a tube in a body that carries fluids.
well it has a tube, and that tube is within a tube. therefore, the tube is somehow within the tube. that explains it
The phylum that has a body plan that is essentially a tube within a tube is the Phylum Platyhelminthes, which includes flatworms. They have a simple body structure with a digestive tract that is a tube running from mouth to anus along the central axis of their body.
Phloem as it transports sugars two ways
Hounslow Central tube station was created in 1886.
Hendon Central tube station was created in 1923.
Finchley Central tube station was created in 1867.