Heart Valves and Unidirectional Blood Flow — NEET Biology
📚 Practice ConceptThe valves in the heart allows the flow of blood only in one direction, i.e., from the atria to the ventricles and from the ventricles to the pulmonary artery or aorta. These valves prevent any backward flow.
Assertion (A): Heart valves ensure efficient pumping action of the heart. Reason (R): The valves in the heart allow unidirectional flow of blood from atria to ventricles and from ventricles to major arteries.
View solution & NCERT explanation
Correct answer: A — If both assertion and reason are true and the reason is the correct explanation of the assertion.
NCERT confirms valves ensure efficient pumping (Assertion true). NCERT states “The valves in the heart allows the flow of blood only in one direction, i.e., from the atria to the ventricles and from the ventricles to the pulmonary artery or aorta” (Reason true). The Reason explains HOW efficient pumping is achieved - through unidirectional flow mechanism.
What does NCERT say about valves heart allows flow?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.