| I: | Neural signals through sympathetic nerves |
| II: | Neural signals through parasympathetic nerves |
| III: | Adrenal medullary hormones |
| 1. | Only I and II |
| 2. | Only I and III |
| 3. | Only II and III |
| 4. | I, II and III |
The activities of the human heart can be regulated through the autonomic nervous system by a special neural center located in:
| 1. | Medulla oblongata | 2. | Hypothalamus |
| 3. | Mid brain | 4. | Cerebrum |

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