Read the following statements and select the correct ones
(i) Nodal tissue is specialised cardiac musculature in human heart which has the ability to generate action potential due to an external stimuli
(ii) Position of SAN - right corner of right atrium
(iii) Position of AVN - right corner of ventricle
(iv) AV bundle continues from AVN
(v) Purkinje fibres are modified cardiac muscle fibres that originate from the atrioventricular node and spread into the two ventricles.

Options

A. (i) and (ii)
B. (i) and (iii)
C. (ii),(iv) and (v)
D. all of these

Explanation

To determine which statements about the nodal tissue and its components in the human heart are correct, we will analyze each statement one by one.

1. **Statement (i)**: "Nodal tissue is specialized cardiac musculature in human heart which has the ability to generate action potential due to an external stimuli."
- **Analysis**: This statement is incorrect. The nodal tissue, specifically the sinoatrial node (SAN), generates action potentials intrinsically, meaning it does so without the need for external stimuli. The heart has its own pacemaker system that controls heartbeats.

2. **Statement (ii)**: "Position of SAN - right corner of right atrium."
- **Analysis**: This statement is correct. The sinoatrial node (SAN) is indeed located at the right corner of the right atrium.

3. **Statement (iii)**: "Position of AVN - right corner of ventricle."
- **Analysis**: This statement is incorrect. The atrioventricular node (AVN) is located at the junction of the atria and ventricles, specifically in the right atrium, not in the right ventricle.

4. **Statement (iv)**: "AV bundle continues from AVN."
- **Analysis**: This statement is correct. The AV bundle (also known as the bundle of His) originates from the AVN and continues into the ventricles.

5. **Statement (v)**: "Purkinje fibres are modified cardiac muscle fibres that originate from the atrioventricular node and spread into the two ventricles."
- **Analysis**: This statement is correct. Purkinje fibers are indeed modified cardiac muscle fibers that spread throughout the ventricles, allowing for coordinated contraction.

### Summary of Correct Statements:
- Correct statements are (ii), (iv), and (v).

### Final Answer:
The correct statements are (ii), (iv), and (v).

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