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[A]: in mammalian heart there is a very ...

[A]: in mammalian heart there is a very swift conduction of stimulation all over the body.
[R]: Conduction of stimulation is caused by Purkinje fibres and Bundle of His

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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The correct Answer is:
A
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Draw diagram of conducting system of human heart. Label SA node and bundle of His.

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.

Which is the correct route through which pulse making, impulse travels in the heart? (A) SA node - - - - AV node - - - Bundle of His - - - - Purkinje fibres (B) AV node - - - Bundle of His - - - - SA node - - - Purkinje fibres - - - heart muscles (C) AV node - - - SA node - - - Purkinje fibres - - - Bundle of His - - - heart muscles (D) SA node - - - Purkinje fibres - - - Bundle of His - - - AV node - - - heart muscles.

Given these structures of the conduction system of the heart 1. Bundles of His 2. AV node 3. Bundle branches 4. Purkinje fibres 5. SA node Choose the arrangement that lists the structures in an order of an action potential passes through them.

In these following correct statement about the heart are I. The sino-atrial node (SAN) is present in the right top corner of the right atrium II. Ligamentum arteriosum connects the aorta and pulmonary trunk. III. Purkinje fibres constituent a portion of the bundle of His . IV. The pulmonary trunk connects the right ventricle to the lungs

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