no, however the heart, air passage ways, and blood vessels are.
Haversian canals
the passage way of blood is the vessel
The blood-brain barrier is effective against the passage of ? Metabolic waste such as urea
For air conditioning
There are 11 passage ways in The Great Pyramid of Giza.
look for the secret passage ways
passage ways
Seven passage ways connected with the pharynx are the larynx, trachea, 2 Eustachian tubes, 2 sinuses and the mouth or buccal cavity.
Squamous epithelial cells can be found in the lining of blood vessels, alveoli in the lungs, and the skin's outermost layer. They are flat and scale-like in shape, providing protection and allowing for efficient diffusion of substances.
NO there is not
alot.