(1) Since the pern; beral resistance vessels are intimately involved in regulation of systemic arterial blood pressure, the effects of both agents were tested on human peripheral resistance vessels (150-400pm diameter) in vitro.
Pirn
Definition:
(n.) A quill or reed on which thread or yarn is wound; a bobbin; also, the wound yarn on a weaver's shuttle; also, the reel of a fishing rod.