Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): In a frog, the left atrium receives deoxygenated blood from the different parts of the body. Reason (R): The sinus venosus receives deoxygenated blood through the vena cava and opens into the right atrium. In the light of the above statements, choose the most appropriate answer from the options giv

Step-by-step solution

In frogs, the left atrium receives oxygenated blood from the lungs and skin, whereas the right atrium receives deoxygenated blood from the body. Therefore, the Assertion is false. The sinus venosus is a triangular structure attached dorsally to the heart. It receives deoxygenated blood through the major veins called vena cava and opens into the right atrium. Therefore, the Reason is true. Answer: Assertion is false but Reason is true.