Bicuspid and tricuspid valves open when:

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Question

(C) The bicuspid (mitral) and tricuspid valves are atrioventricular valves. These valves open when the pressure in the atria exceeds the pressure in t

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Blood flows from the right and left atria into the right and left ventricles,respectively.

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(C) The bicuspid (mitral) and tricuspid valves are atrioventricular valves. These valves open when the pressure in the atria exceeds the pressure in the ventricles,allowing blood to flow from the right and left atria into the right and left ventricles,respectively. Once the ventricles begin to contract,the pressure inside them rises,causing these valves to close to prevent the backflow of blood into the atria.

Column-$I$	Column-$II$
$a$. Superior Vena Cava	$p$. Carries deoxygenated blood towards the lungs
$b$. Inferior Vena Cava	$q$. Carries oxygenated blood away from the lungs
$c$. Pulmonary Artery	$r$. Brings deoxygenated blood from lower body parts to the right atrium
$d$. Pulmonary Vein	$s$. Brings deoxygenated blood from upper body parts to the right atrium

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