Question

Three chambered heart of frog is not as efficient as four chambered human heart because-
A. Oxygenated and deoxygenated bloods mix up
B. Ventricle does not pump blood properly
C. It does not hold enough blood
D. Heart mussels are not strong

Answer 1

The circulatory system in the multicellular organisms are involved in the exchange of respiratory gases which transport oxygen and food to cells and removal of carbon dioxide and metabolic wastes. The heart is the main part of circulatory systems. The heart is three-chambered in the amphibians and in mammals, the heart consists of the four chambers.

Complete answer:
The heart is a muscular organ that is part of the circulatory system found in most animals. The heart pumps blood through the blood capillaries of the circulatory system. The pumped blood carries oxygen and nutrients to different parts of the body. It also carries metabolic waste such as carbon dioxide to be removed through the lungs.
In the heart of a frog three chambers are present consisting of two atria and a single ventricle. The three-chambered heart is also known as a transitional heart. The right atrium receives deoxygenated i.e. impure blood from the blood veins and drains the various organs of the body. The left atrium receives oxygenated i.e. pure blood from the lungs and skin. Both atria empty into the single ventricle. In this system the deoxygenated and oxygenated blood are mixed in the ventricle before being pumped out of the heart. It is a very inefficient method when compared to the mammalian heart.
The heart of a human is four chambered and it is also called a double circuit heart. This type of heart is divided into four chambers consisting of two atria and two ventricles. The atria receive the blood, while the ventricles pump blood to different parts of the body. In the mammalian heart which is a four-chambered and the heart is divided completely. The atrium and ventricle of the heart are completely separated in four-chambered which prevents the mixing of the oxygenated and deoxygenated blood. This property of the four chambered hearts is highly efficient in nature and provides an advantage to the warm-blooded mammals.

Therefore, the correct answer to the option A.

Note: The heart, a muscular organ, is a part of the circulatory system which mainly pumps blood and through the blood, it helps to transport oxygen and other metabolic waste. In the case of the frog, the heart is three chambered. Here the right atrium receives deoxygenated blood and the left atrium receives oxygenated blood. As both the atrium opens into the ventricle, both types of blood get mixed. For this reason, the three chambered hearts are not as efficient as four chambered human hearts.