What are the similarities and differences between the respiratory systems of fish and humans?

What are the similarities and differences between the respiratory systems of fish and humans? What are the similarities and differences between the respiratory system of fish and insects?

There are two main similarities between the respiratory system of fish and humans. The first similarity is that in fish of all species, the skin takes part in respiration, just like in humans (the epidermis takes part in respiration). The second similarity is that in the process of respiration, both in fish and in humans, the circulatory system takes part, which brings venous blood, and already removes arterial blood. The difference lies in the organs of the respiratory system themselves.

In fish, the respiratory system is represented by gills and the swim bladder serves as an additional respiratory organ.

The respiratory system of most insects is represented by a multitude of air tubes – tracheas that permeate the entire body and entangle the organs. It is the structure of the respiratory system itself that is the difference