Question

Assertion : The atria and ventricles are devoid of valves Reason : The valves prevent the backward flow of bood when atria or ventriles contract

Answer 1

Answer:

the assertion is wrong because as matter of fact atria is followed by artioventricular valves so as to prevent back flow so as to avoid mixing (because we are not frog or fish) the valves are

between left atrium to left ventricle -- bicuspid valve also known as mitral valve

between right atrium to ventricle -- tricuspid valve

and I think now you know that the reason is correct but the assertion is wrong if not something is fishy

Answer 2

Explanation:

the reason is correct assertion is wrong