Why Every Human Should Come with a Built-in Snorkel

Imagine you are sitting at a pleasant dinner, laughing, when suddenly a piece of bread goes the wrong way. In the blink of an eye, joy turns into panic. You cough and gasp for air, but your airway is blocked. This all-too-familiar scenario illustrates a major biological flaw: our respiratory system is awkwardly put together from a design perspective. It is strange that we breathe through the same passage we use to eat. Yet, this arrangement exists because our vertebrate ancestors evolved to combine these pathways, allowing air and food to travel through the same opening for efficiency during development. For millions of years, this dual-use system persisted, even though it now makes us vulnerable to suffocation.

The biggest problem is the illogical position of our air intake. The mouth and nose are located far from the lungs, and air must pass through the pharynx, a busy junction shared by food and drink. The esophagus and trachea share an entrance, making suffocation a constant risk. If the epiglottis malfunctions, the airway becomes completely blocked. In our current setup, air follows a long, dangerous route to the blood. By comparison, dolphins and whales have a blowhole on top of their heads that is used exclusively for breathing. This keeps breathing and eating completely separate, enabling them to catch and swallow food without risking water entering their lungs. Fish also have gills dedicated solely to respiration, allowing them to breathe continuously even while eating. Fish face very different respiratory challenges because water is much denser and contains less oxygen than air, which has influenced the evolution of their respiratory systems.

In humans, the path of air from the nose and mouth to the lungs might seem less direct, but this design reflects the adaptation to breathing air rather than water. This is where the idea of ​​human gills becomes intriguing. Imagine sophisticated openings on the chest, directly above the lungs. The safety benefits would be enormous, as choking on food would no longer be possible. One could eat, talk, and breathe separately. Moreover, the shorter route would reduce the effort required to breathe. Of course, this is a speculative concept, as humans do not possess the genetic structures necessary to develop functional gills. There is currently no scientific evidence that humans can naturally evolve true gills for breathing. Nevertheless, exploring this possibility helps us understand the limitations of our biology and shows how alternative anatomical arrangements could solve real problems.

Breathing through your side could have a calming effect and help with practical matters, such as a stuffy nose during a cold. Our mouth is currently a multitasker used for eating, talking, kissing, and breathing. With gills, the mouth could focus on expression and feeding, while breathing became an effortless, invisible process, far removed from the turmoil in the throat. Naturally, shifting breathing to gills could come with disadvantages. Gills would claim space in the chest cavity, potentially affecting the structure of our rib cage and even changing the way we speak or eat. For example, some vocal sounds depend on airflow through the mouth and nose, which could alter speech. Even the experience of taste could be different, since smell and taste are closely linked to breathing through the mouth. These potential consequences are worth considering, even while we daydream about the benefits.