'P' in the heart have thicker muscular walls than 'Q' do. Also, 'R' ensure that blood does not flow backwards when the 'P' or 'Q' contract. Identify 'P','Q' and 'R'.

P: Ventricles, Q: Atria, R: Valves

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

P: Atria, Q: Ventricles, R: Valves

No worries! We‘ve got your back. Try BYJU‘S free classes today!

P: Ventricles, Q: Blood vessels, R: Atria

No worries! We‘ve got your back. Try BYJU‘S free classes today!

P: Blood Vessels, Q: Atria, R: Valves

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A P: Ventricles, Q: Atria, R: Valves
The right atrium of the heart links to the right ventricle by the tricuspid valve while the left atrium links to the left ventricle by the bicuspid valve. These valves prevent backflow of the blood into the atrium when the ventricle contracts. Ventricles have thicker muscular walls than atria. When each atrium contracts, it only needs to propel the blood a short distance into each ventricle while the ventricles need a more powerful contraction to propel blood to the systemic circulation. Therefore:
P $\to$ Ventricles, Q $\to$ Atria and R $\to$ Valves

Suggest Corrections

Similar questions

P in the heart have thicker muscular walls than Q do. Also, R ensure that blood does not flow backwards when the atria or ventricles contract.
P is ________

Q is ______

and R is_________

What prevents the backflow of blood inside the heart during contraction ?
(a) thick muscular walls of ventricles
(b) valves
(c) thin walls of atria
(d) all of the above

Question 18
What prevents backflow of blood inside the heart during contraction?

(a) Valves in heart
(b) Thick muscular walls of ventricles
(c) Thin walls of atria
(d) All of the above

Q. Identify the correct option.
Statement 1: Blood from venacava and pulmonary veins enters the right and left atria respectively.
Statement 2: The aperture between the atria and the ventricles is closed by valves.

Q. 'P' in the heart have thicker muscular walls than 'Q' do. Also, 'R' ensure that blood does not flow backwards when the 'P' or 'Q' contract. Identify 'P','Q' and 'R'.

Join BYJU'S Learning Program