Give reasons:
The left auricle contains oxygenated blood.

Assertion : The heart of fish contains only deoxygenated blood. Reasoning : Oxygenated blood does not return back to the heart in fishes.

Pulmonary veins carry oxygenated blood.

Read the assertion and reason carefully to mark the correct option out of the options given below: (a) If both the assertion and the reason are true and the reason is a correct explanation of the assertion (b) If both the assertion and reason are true but the reason is not a correct explanation of the assertion (c) If the assertion is true but the reason is false (d) If both the assertion and reason are false (e) If the assertion is false but reason is true Assertion : Heart of fish contains only deoxygenated blood. Reason : Oxygenated blood do not return back to the heart in fishes.

Which side of the heart contains oxygenated (pure) blood ?

Assertion : Double circulation is incomplete in amphibians and reptiles Reason : Unlike in birds and mammals, in amphibian and reptiles, the left atrium receives oxygenated blood and right atrium receives deoxygenated blood.

. . . . . .A . . . .. Originates from left ventricle, distributes oxygenated blood to various body parts except . . . . B . . . . .C. . . . Are four in number, bring oxygenated blood from lungs to left . . . .. D. . . . Fill in the blanks by selecting the correct option wrt majorblood vessels of the heart.