Fenestrae (singular: fenestra) are small pores in epithelial cells to allow for rapid exchange of molecules between blood vessels and surrounding tissue. These pores can enlarge and contract at the action of various stimuli such as noradrenaline. The word is also used to refer to openings in the skull or other bones. Fenestrae is the Latinplural for windows. A pore, in general, is some form of opening, usually very small. ... In zootomy, epithelium is a tissue composed of a layer of cells. ... The arterial system The blood vessels are part of the circulatory system and function to transport blood throughout the body. ... Norepinephrine, known as noradrenaline outside the USA, is a catecholamine and a phenethylamine with chemical formula C8H11NO3. ... Latin is an ancient Indo-European language originally spoken in the region around Rome called Latium. ... Look up Plural in Wiktionary, the free dictionary Plural is a grammatical number, typically referring to more than one of the referent in the real world. ... A window is an opening in an otherwise solid, opaque surface through which light and sometimes air can pass. ...
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