Question

Illustrate and discuss the flow of blood in fish.

Answer 1

Explanation:

In fish, blood flows in one continuous loop from the tissues to the heart to the gills and back to the tissues. The two chambers of the fish heart are called the atrium and the ventricle. Both of these chambers have thick, muscular walls. Blood flowing in the veins from the body tissues to the heart first enters a sac-like compartment called the sinus venosus. From there it enters the atrium. Blood collected in the atrium is passed into the ventricle, where it is pumped into a tube-shaped region of the heart called the bulbus arteriosis that connects the heart to the aorta. The aorta is a large artery that brings the blood from the heart to the gills, where it becomes oxygenated.