NEET 2010 Biology question

If due to some injury the chordae tendinae of the tricuspid valve of the human heart is partially non-functional, what will be the immediate effect

(1)The pacemaker will stop working
(2)The blood will tend to flow into the left atrium
(3)The flow of blood into the pulmonary artery will be reducedCorrect
(4)The flow of blood into the aorta will be slowed down

Answer: (3)

Solution

The tricuspid valve lies between the right atrium and right ventricle. Its cusps are held by the chordae tendineae (attached to papillary muscles) so that they do not flip back into the atrium when the ventricle contracts. If these are partly non-functional, the valve becomes leaky and during right ventricular systole

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Question ID VK-090556