Question
Atria and ventricles:
| Atria | Ventricles |
| 1. Atria are the upper chambers of the heart. | 1. Ventricles are the lower chambers of the heart. |
| 2. Atria are the smaller receiving chambers. | 2. Ventricles are the larger distributing chambers. |
| 3. Atria are thin walled chambers having lesser blood pressure. | 3. Ventricles are thick walled chambers with greater blood pressure. |
| 4. Atria do not have inlet valves. | 4. Ventricles have inlet valves. |
| 5. Right atrium receives deoxygenated blood from whole body through the inferior vena cava (lower body), superior vena cava (from upper body). It pumps blood into right ventricle. | 5. Right ventricle pumps deoxygenated blood received from right atrium to lungs for oxygenation which is known as pulmonary circulation. |
| 6. Left atrium receives oxygenated blood from lungs through pulmonary veins. It pumps blood into left ventricle. | 6. Left ventricle pumps oxygenated blood received from left atrium to whole body. This is called systemic circulation. |
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