Q79 / 200 · MHT CET - Medical 2026 (23 April Shift 1) · Biology
Choose the INCORRECT statement related to human heart valves.
- AThe right atrioventricular aperture is guarded by tricuspid valve.
- Correct answerBThe opening of the postcaval into the right atrium is guarded by a Thebesian valve.
- COpenings of pulmonary veins into the left atrium lack valves.
- DThe openings of the pulmonary artery and the aorta are guarded by three semilunar valves.
Solution
The right atrioventricular aperture is guarded by the tricuspid valve.
The opening of the postcaval (inferior vena cava) into the right atrium is guarded by the Eustachian valve. The Thebesian valve guards the opening of the coronary sinus into the right atrium. Thus, the statement regarding the postcaval opening is incorrect.
The openings of the pulmonary veins into the left atrium lack valves.
The openings of the right and left ventricles into the pulmonary artery and the aorta respectively are guarded by semilunar valves.
Answer: The opening of the postcaval into the right atrium is guarded by a Thebesian valve.
The opening of the postcaval (inferior vena cava) into the right atrium is guarded by the Eustachian valve. The Thebesian valve guards the opening of the coronary sinus into the right atrium. Thus, the statement regarding the postcaval opening is incorrect.
The openings of the pulmonary veins into the left atrium lack valves.
The openings of the right and left ventricles into the pulmonary artery and the aorta respectively are guarded by semilunar valves.
Answer: The opening of the postcaval into the right atrium is guarded by a Thebesian valve.
Hence, the correct answer is option: 'B'.