Question

Right atrium or auricle in mammalian heart receives blood from

• A. Precavals
• B. Precavals and postcavals
• C. Pulmonary veins
• D. Sinus venosus

Answer 1

The correct option is B Precavals and postcavals

The superior and inferior vena cavas (pre and post caval) are the great veins which empty blood in the right auricle.
Superior Vena Cava is the veins of the head, neck, upper extremities, and chest all drain into the superior vena cava, which goes to the heart. It is formed by the union of the right and left brachiocephalic veins, which drain the head, neck, and upper extremities. The azygos vein drains the veins of the chest wall and empties into the superior vena cava just before the latter empties into the heart.
Inferior Vena Cava is much longer than the superior vena cava and returns the blood from the parts of the body below the diaphragm. It begins in the lower abdomen with the union of the two common iliac veins. It then ascends along the back wall of the abdomen, through a groove in the posterior part of the liver, through the diaphragm, and finally through the lower thorax to empty into the right atrium of the heart.

So, the correct answer is option B.