sinusoids
They are called Alveoli.
alveoli are lined with capillary endothellium which are opened in blood vessels
the small intestine is lined with villi
Simple squamous epithilium
English Tree lined road are usually wide Roads and are called Avenues.
Geode
a sestet.
Alameda.
a Quatrain
Natural ones are called orifices. Artificial ones are called stomas.
Usually an Avenue. A tree-lined walk is called an allee. :)
Methamorpic Rock .