2 - The Arterial System

摘要: This chapter describes the arterial system of fishes. The primary circulation fishes follows typical vertebrate pattern in that a heart forces blood into ventral aorta, which then gives off paired vessels arch upward among successive gill clefts and rejoin to form dorsal aorta. is remarkably constant general cyclostomes, elasmobranchs, teleosts. Major modifications posterior branchial arteries occur air-breathing For efficient gas exchange, water flow over gills through should be continuous. Continuous may achieved by elastic recoil vessel walls stretched during systolic ejection. best estimate extent this windkessel function aortic from measurements made on main vessel, either just outside conus or bulbus between pairs arteries. Recordings these situations show major differences patterns cyclostomes elasmobranchs one hand teleosts other, although not truly indicative flow. pressure relationships aortas are also elaborated chapter.