Fish have gills, and filter oxygen from the water. Humans have lungs and get their oxygen from the air.
a organ systems are shared by both fish and birds because they have the same respiratory system, nervous system and reproductive system.
There are many similarities between fish and humans. Fish and humans have many of the same organs. We both have a digestive system and a reproductive system.
The human respiratory system is designed for efficient gas exchange, allowing for the intake of oxygen and the expulsion of carbon dioxide, which supports high metabolic activity and energy production. In contrast, a fish respiratory system utilizes gills to extract oxygen from water, allowing fish to thrive in aquatic environments where oxygen levels can be lower. Both systems are highly specialized for their respective environments, enabling each organism to maximize oxygen uptake and maintain metabolic functions effectively. This adaptation illustrates the diversity of life and the evolutionary solutions to respiratory challenges in different habitats.
gills
Most fish use gills for gas exchange instead of lungs
Most fish use gills for gas exchange instead of lungs
Both fish and mammals have specialized respiratory systems designed for gas exchange, although they operate in different environments. Fish use gills to extract oxygen from water, while mammals utilize lungs to absorb oxygen from air. In both systems, oxygen is exchanged for carbon dioxide through diffusion across respiratory surfaces, and both rely on a circulatory system to transport gases throughout the body. Additionally, both systems are highly efficient, adapted to meet the oxygen demands of their respective lifestyles.
Because a dolphin is a mammal, and not a fish. A dolphin's respiratory system is similar, for the most part, to a human's respiratory system.
Humans primarily use air as their respiratory medium, extracting oxygen from the air and releasing carbon dioxide. Fish, on the other hand, use water as their respiratory medium, extracting oxygen from the water through their gills.
Humans must first dissolve the gasses in water (in the alveolii of the lungs) before we can extract it, whereas fish only can get the gasses already dissolved. Also - fish have a one-way respiratory system whereas humans have an in and out respiratory system.
Evolution.
they dont have respiratory systems like we do, they have gills. They can only breath in liquid water environments