What is the function of the bulbus arteriosus in a perch?

The bulbus arteriOSus in a perch functions as a flexible chamber that helps to regulate blood flow from the heart to the gills and the rest of the body. It acts as a reservoir that smooths out the pulsatile output of the heart, ensuring a more continuous and steady flow of blood. This structure also aids in maintaining blood pressure and facilitating efficient gas exchange in the gills. Overall, it plays a crucial role in the circulatory system of the fish.