In the circulatory system of fish, the bulbus arteriosus is a pear shaped chamber that functions as a capacitor, maintaining continuous blood flow into the gill arches.

What does the bulbus arteriosus do?

The bulbus arteriosus of teleost fish is a thick-walled chamber that extends between the single ventricle and the ventral aorta. The functional importance of the bulbus resides in the fact that it maintains a steady blood flow into the gill system through heart contraction.

What is the function of the bulbus arteriosus in frogs?

2.2 The Bulbus Arteriosus. The bulbus arteriosus is the morphologically predominant portion of the OFT in more advanced teleosts. It acts as an elastic reservoir, expanding during ventricular contraction to accommodate a large part of the stroke volume, a “windkessel” function (Farrell, 1979; Johansen, 1962).