The question requires matching the valves of the human heart from Column I to their respective positions or functions described in Column II. Let's analyze each item:
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Tricuspid Valve: The tricuspid valve is located between the right atrium and the right ventricle. It allows blood to flow from the right atrium to the right ventricle and prevents backflow of blood when the right ventricle contracts. Hence, it matches with iii. Between right atrium and right ventricle.
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Bicuspid (Mitral) Valve: The bicuspid valve, also known as the mitral valve, is located between the left atrium and the left ventricle. It facilitates blood flow from the left atrium to the left ventricle and prevents backflow during contraction of the left ventricle. Thus, it corresponds to i. Between left atrium and left ventricle.
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Semilunar Valve: The semilunar valves are responsible for preventing backflow of blood from the arteries to the ventricles. One of these is located between the right ventricle and the pulmonary artery, called the pulmonary valve. Therefore, it aligns with ii. Between right ventricle and pulmonary artery.
Based on this analysis, the correct matching is:
a-iii, b-i, c-ii
Thus, the correct answer is: a-iii, b-i, c-ii.