What is the difference between internal and external respiration?

Internal Respiration

External Respiration

1. This type of respiration takes place in the cells of the body.
2. Breathing is not involved in internal respiration.
3. It can occasionally occur in the absence of oxygen .
4. It is always an involuntary process.
5. Example: Between blood and cells

1. This type of respiration takes place between the cells and the external environment.
2. Breathing is involved .
3. It cannot occur in the absence of oxygen.
4. It is both a voluntary and involuntary process .
5. Example : Between environment and lungs