Question

Right atrium of the rabbit receives
(a)Two anterior vena cava
(b)Two posterior vena cava
(c)One anterior and one posterior vena cava
(d)None of the above

Answer 1

Hint: The rabbit's right atrium receives higher and inferior hollow veins. The superior vena cava and the inferior vena cava are found in humans, and they both empty in the right atrium. They are positioned slightly off-center, on the body's right side.

Complete answer:
The anterior (superior) vena cava and posterior (inferior) vena cava receive deoxygenated blood from the right atrium of the mammalian heart. The right atrium has, therefore, only deoxygenated blood. For purification, the deoxygenated blood from the right atrium goes to the lung after systole.
Via the coronary sinus and two large veins called venae cavae, the right atrium acquires deoxygenated blood.
The inferior vena cava (or caudal vena cava in some animals) moves with blood from the lower part of the body next to the abdominal aorta. In the human body, it is the largest vein.
Over the heart is the superior vena cava (or cranial vena cava in animals), which forms from a fusion of the brachiocephalic left and right veins containing blood from the head and arms.
So, the correct answer is, ‘One anterior and one posterior vena cava’.

Note: The primary method of transport is the circulatory system in animals. A rabbit's heart is conical, muscular, and lies between the two lungs in the thoracic cavity. While the conical end is directed downward, the wider end of the heart is towards the upper side. In two superior venae cavae and one inferior vena cava, the right auricle receives impure or deoxygenated blood from various regions of the body. By means of pulmonary veins, the left atrium receives pure or oxygenated blood from the lungs.
When blood fills the auricles, they contract through auriculo-ventricular apertures to drive the blood into the two ventricles. When blood fills the ventricles, they contract to drive the aortic trunks into the blood.