The definition of naturalism is a view, particularly a philosophical and artistic one, that bases everything on what can be seen, what is viewed as natural and what is viewed as Earthly. An example of naturalism is an atheistic viewpoint. naturalism.
is caffeine a vasoconstrictor or a vasodilator? Answers: vasoconstrictor. vasoconstritor and a diuretic. Caffeine is also a known competitive inhibitor of the enzyme cAMP-phosphodiesterase (cAMP-PDE), which converts cyclic AMP (cAMP) in cells to its noncyclic form, allowing cAMP to build up in cells.
Caffeine is a well-known adenosine-receptor antagonist (15, 16), and adenosine can cause vasodilation in several regional circulations (particularly in the forearm) (32-34) as well as attenuate the release of renin (2).