Cardiac activities of the heart are regulated by: A. Nodal tissue B. A special neural centre in the medulla oblongata C. Adrenal medullary hormones D. Adrenal cortical hormones Choose the correct answer from the options given below :

1. A. A, B and D Only
2. B. A, B and C Only
3. C. A, B, C and D
4. D. A, C and D Only

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