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involuntary muscle found in the walls of blood vessels, in digestive, respiratory, urinary and reproductive tracts, in the iris and ciliary muscles of the eye and in the skin.
a perforated wall or part of a wall at the end of one of the individual cells making up a sieve...
a ductless gland that secretes hormones directly into the bloodstream, to be transported to...
those species that are found only in a particular area or region and nowhere else on Earth.
a structure that is used by molluscs for feeding. It is a minutely toothed, chitinous ribbon...
the inner body tissue layer that forms the gut and other internal organs.