The structure that carries oxygenated blood from the lungs to the heart is the:
A. Aorta
B. Pulmonary artery
C. Pulmonary vein
D. Superior vena cava
Answer: Option C
Solution (By JKExamLibrary)
The four pulmonary veins drain oxygen-rich blood from the lungs into the left atrium. The pulmonary artery carries deoxygenated blood from right ventricle to lungs. Vena cava brings deoxygenated blood to right atrium.
Explanation:
Louis Pasteur, a French microbiologist, is famous for several groundbreaking contributions. He developed the process of pasteurization (heating liquids to kill harmful microbes). He also conclusively disproved the theory of spontaneous generation using his famous swan-neck flask experiment, demonstrating that life only arises from pre-existing life (biogenesis). He also developed vaccines for rabies and anthrax.
Explanation:
Vitamin K-dependent carboxylation allows prothrombin and other clotting factors to bind calcium and participate in coagulation. Deficiency prolongs clotting time.
Explanation:
Birds (Aves) and mammals (Mammalia) are endothermic (warm-blooded) and possess a four-chambered heart, allowing complete separation of oxygenated and deoxygenated blood. Amphibians have a three-chambered heart, reptiles mostly three-chambered (except crocodilians), fish two-chambered. This allows high metabolic rates.
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