What is the function of the valves within the heart?

Physical Education

JAMB 2025

A. To produce the electrical impulses that regulate the heart beat.
B. To prevent the backflow of blood, ensuring it flows in one direction.
C. To separate the oxygenated blood from the deoxygenated blood.
D. To produce the 'lub-dub' sound of the heart beat.

WAEC offline past questions - with all answers and explanations in one app - Download for free

WAEC and NECO CBT Software for Computers and Laptops - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now

WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 127076

Correct Answer: Option B

Explanation

The valves within the heart - including the mitral, tricuspid, aortic, and pulmonary valves - act as one-way gates that
open and close to regulate blood flow through the heart's chambers. Their primary function is to prevent the backward
flow of blood during the contraction and relaxation phases, ensuring efficient circulation and maintaining unidirectional
blood movement through the heart and to the rest of the body. This function is crucial for maintaining proper cardiac
output and preventing mixing of oxygenated and deoxygenated blood.

Previous Next

Go back to PHE classroom

Report an Error Ask A Question Download App