Question

In the given figure of the heart which of the marked structures (1,2,3,4,5) carry oxygenated blood?

A. 1,2,3 and 4
B. 1 and 5
C. 1 and 4
D. 3 and 5

Answer 1

The blood enters the ventricles of the heart through the upper chamber of the atrium. The left atrium receives blood from the lung, and the right atrium receives blood from the venous circulation. Systole helps to move the blood to the ventricles that are received from the atria during the relaxation of the diastole.

Complete answer: Right atrium holds deoxygenated blood from the superior vena cava that is represented by the number 1, and also received anterior cardiac veins represented by 2, inferior vena cava and smallest cardiac veins that present in the coronary sinus part of the heart and pump the blood through the tricuspid valves represented by number 3. After all the process the blood turns and again flows through the pulmonary artery to the pulmonary circulation part of the heart. The left atrium receives oxygenated filtered blood from the right-left pulmonary veins and pumps towards the left ventricle with the help of a mitral valve that is represented by numbers 4 and 5. The right heart is always referred to as the right ventricle and right atrium. The left ventricle and left atrium are referred to as the left side of the heart. Aorta used for oxygenated blood, right atrium used for deoxygenated blood, right ventricle used for deoxygenated blood, and pulmonary artery also used for the same, and left ventricle also used for the oxygenated blood.
Therefore the correct option is (C).

Note: In humans two atria and in animals at least one atrium present in the closed circulatory system. The auricle is also known as the name of the atrium and the term used for the chamber in some animals Mollusca in the description. The right atrium left atrium, and right ventricle, and left ventricular four parts of the human heart.