MCQ
$A$ : The cardiac impulse which originates from $SA$ node in mammalian heart cannot spread directly from atria to ventricles.
$R$ : In mammalian heart there is no continuity between cardiac muscle fibres of atria and those of ventricles except $AV$ bundles.
$R$ : In mammalian heart there is no continuity between cardiac muscle fibres of atria and those of ventricles except $AV$ bundles.
- ✓Assertion and Reason both are correct and also correct explanation.
- BAssertion and Reason both are correct but not explanation of assertion.
- CAssertion is correct, but Reason is incorrect.
- DBoth Assertion and Reason are incorrect.