
Answer: Diagram shows AV node (central relay), Bundle of His (conduction pathway), and Purkinje fibres (ventricular spread).
| List I | List II |
|---|---|
| A. Heart | III. Atrial natriuretic factor |
| B. Kidney | I. Erythropoietin |
| C. Gastrointestinal Tract | IV. Secretnin |
| D. Adrenal Cortex | II. Aldosterone |
