| Internal Respiration | External (Surfacial) Respiration |
| $(1)$ It occurs inside the cell. | $(1)$ It occurs at the respiratory surface. |
| $(2)$ Exchange of respiratory gases does not occur here. | $(2)$ Exchange of respiratory gases occurs between the atmosphere and blood. |
| $(3)$ Energy is released in the form of $ATP$. | $(3)$ Energy is not released. |
| $(4)$ It is a complex biochemical process. | $(4)$ It is a physical process based on the law of partial pressure of gases. |
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