Do Our Nostrils Alternate Between Open and Closed?: Unraveling the Mystery

Introduction

The idea that our nostrils alternate between being open and closed is a common misconception. In reality, unless we are ill, our nostrils do not close completely. However, during normal breathing, one nostril tends to be slightly more open than the other. This phenomenon, although currently not fully understood, may serve a unique evolutionary purpose in enhancing our sense of smell and facilitating better air intake during nasal breathing.

Key Points Explained

Understanding Nostril Alternation

While it is true that one nostril may predominantly be more open than the other during normal breathing, the misconception arises when one assumes that a nostril can close completely. In health, only slight inactivity is observed in one nostril while the other remains open and functional.

One Nostril Being More Open

One possible reason for the slight alternation is that it helps us to accurately detect and follow scents. The strength of a scent is determined by its direction relative to the more open nostril, making it easier to identify the source of an odor.

Opposite Claims

Contrary to this, another claim insists that both nostrils are consistently in use during normal breathing unless one is blocked due to external factors such as a finger, yoga breathing exercises, congestion, or an accident. In such cases, the air still enters through both nostrils, although one might be less functional than the other.

Historical Observations and Current Theories

The idea of nostril alternation is not a new concept. Up until a century ago, observations supporting this theory were often cited. However, the weight of this evidence is questionable, leading some to regard this as an urban legend that cycles back to public consciousness periodically.

Upper Airway Anatomy

Our upper airway is naturally divided into two nostrils, which are both necessary for optimal breathing. If one nostril were to be closed completely, the resistance to airflow would increase dramatically. According to Poiseuille's law, the resistance would increase by a factor of 16 times (2^4). This underscores the importance of both nostrils working together for efficient and unobstructed respiration.

Conclusion

The idea that our nostrils alternately close and open is a misconception, especially when it comes to complete closure. Instead, one nostril tends to be more open than the other, aiding in our ability to detect and follow scents better. Understanding the function and structure of our nostrils can enhance our knowledge of respiratory health and the intricacies of our sensory organs. Staying informed about the correct functioning of the human body can help in maintaining better health and well-being.