Question

describe the process of blood circulation in fish.??? vigya plz msg me through this question plzzz plzzz​

Answer 1

In fish, the heart only has one atrium and one ventricle. The oxygen-depleted blood that returns from the body enters the atrium, and then the ventricle, and is then pumped out to the gills where the blood is oxygenated, and then it continues through the rest of the body. The fish heart needs to generate the driving pressure for both the gills and the body since they are connected in series. In fish, the heart pumps blood first to the gills where the gas exchange takes places, and then the blood continues to the rest of the body. This is a fine balance, since the fish's gills have to be thin walled to facilitate gas exchange ,and thus cannot tolerate high blood pressure. At the same time, the blood pressure will drop when the blood cells squeeze through the lamellae and the blood pressure that remains after the blood had passed through the gills has to be high enough to drive the blood around the body.

Answer 2

Answer:

Explanation:

The two main circulation pathways in invertebrates are the single and double circulation pathways.

Single circulatory pathways

Single circulatory pathways as shown in the diagram below consist of a double chambered heart with an atrium and ventricle (the heart structure will be described in detail later in this chapter). Fish possess single circulation pathways. The heart pumps deoxygenated blood to the gills where it gets oxygenated. Oxygenated blood is then supplied to the entire fish body, with deoxygenated blood returned to the heart.Fish have a two-chambered heart, one atrium and one ventricle.Double circulatory systems

Double circulation pathways are found in birds and mammals. Animals with this type of circulatory system have a four-chambered heart.

The right atrium receives deoxygenated from the body and the right ventricle sends it to the lungs to be oxygenated. The left atrium receives oxygenated blood from the lungs and the left ventricle sends it to the rest of the body. Most mammals, including humans, have this type of circulatory system. These circulatory systems are called 'double' circulatory systems because they are made up of two circuits, referred to as the pulmonary and systemic circulatory systems.