| Nervous System | Endocrine System (Hormonal System) |
| • Made of neurons (nerve cells) | • Made of secretory cells (or glands) |
| • Messages transmitted in the form of electrical impulses. | • Messages transmitted in the form of chemicals called hormones. |
| • Messages transmitted along nerve fibres. | • Messages transmitted in the form of electrical impulses. |
| • Messages transmitted along nerve fibres. | • Messages transmitted through blood stream. |
| • Messages travel very quickly | • Messages travel more slowly. |
| • Effect of message usually lasts for a very short while. | • Effect of message usually lasts longer. |
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