Respiratory System in Fish vs. Dogs

Both the dog and the fish have similar body systems, but function very dissimilar. A dog uses the normal flow of air in and out of its body as a way of breathing. A fish on the other hand, uses its gills as a main source of oxygen; without the gills, a fish could not function properly.

Their respiratory system begins immediately after the puppy is born and takes its first breath (Inside the Human Body: The Respiratory System). A dog’s respiratory system is composed of several parts. The nares, or nostrils is where the inhaled air is exhaled. The nasal cavity, sinuses within the skull, pharynx or the back of the mouth, larynx otherwise known as a voice box, trachea or windpipe, bronchi, and the lungs. Similar to humans, dogs also have left and right lungs; these lungs are then further divided into lobes, or sections (Respiratory System). The lungs are plentiful of air pockets called alveoli. This is the place that the blood makes contact with each individual cell and oxygen is replaced with carbon dioxide. Alveoli are supplied by a massive arrangement of microscopic blood vessels known as capillaries. The alveoli allow used air to pursue the opposite path of new air. From there,

When dogs inhale, the outside fresh air moves through the nose or mouth, then enters the pharynx and larynx in order to end up in the trachea. The trachea is a very important passageway that carries the air to the bronchi, which sequentially supplies the lungs. A dog’s respiratory system is a quite simple process and is completed by the actions of the rib muscles, otherwise known as the intercostals. The movement of another muscle called the diaphragm also greatly helps this method in not only dogs, but in all mammals.

A fish’s main goal is to keep both the blood and the water moving. Otherwise, everything will reach equilibrium and the flow of oxygen will stop. Like dogs, fish must also obtain oxygen into their bodies and remove the carbon dioxide. The respiratory system in fish is however slightly different. It all begins with the gills. Gills are structures that allow water to pass through very fine channels. These also provide a larger surface area to obtain oxygen from. The channels are next to blood vessels which are very thin walls that allow the oxygen to move from the water into the blood (Inside the Human Body: The Respiratory System). The oxygen leaves the water and goes into the blood. From there, it is carried throughout the whole body of the fish (College of Veterinary Medicine).

A dog's respiratory system serves solely two purposes. Initially, it is the exchange apparatus in which a dog’s body’s carbon dioxide can be restored with oxygen. It is also serves as an unique cooling system. Given that dogs do not have

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