valve: Quick Facts

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heart valve renal portal valve chronic venous insufficiency skeleton blood bone connective tissue Tissue heart fluid lymph abdomen Biomolecule

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human cardiovascular system: Origin and development

Key People

Sarpi, detail of a portrait (the black spot on his face covers the scar from an unsuccessful attempt on his life in 1607); in the Bodleian Library, Oxford, Eng.

Paolo Sarpi

Italian theologian