The Role of Nostrils and Nose in the Process of Breathing

Introduction
The nostrils and the nose play crucial roles in the process of breathing. They work together to filter, warm, and humidify the air we breathe, making it suitable for the respiratory system.

1. Nostrils
The nostrils, also known as nasal passages, are the two openings at the base of the nose. They are responsible for the initial entry of air into the respiratory system.

- Air Entry: When we breathe in, the nostrils allow air to enter the nasal passages and subsequently into the lungs. They serve as the primary entry point for inhaled air.

- Filtering: The nostrils are lined with small hairs called cilia and mucus-producing cells. These structures help to filter out dust, pollen, bacteria, and other harmful particles present in the air. They prevent these particles from reaching the delicate structures of the respiratory system.

2. Nose
The nose, located between the nostrils, is a prominent external facial feature. It is composed of various structures that contribute to the process of breathing.

- Moistening and Warming: The nose contains a network of blood vessels close to the surface. As inhaled air passes through the nasal passages, it comes into contact with these blood vessels, which help to warm the air. The nose also secretes mucus, which moistens the air, preventing dryness in the respiratory system.

- Smell: The nose houses olfactory receptors responsible for our sense of smell. These receptors detect and transmit signals to the brain, allowing us to perceive various scents and odors.

- Resonance: The nasal cavity acts as a resonating chamber for sound production. It enhances the quality and tone of our voice.

- Respiratory Defense: The nose contains immune cells and antibodies that help to defend against pathogens present in the air. This defense mechanism helps to prevent respiratory infections.

- Humidification: The nose aids in humidifying the inhaled air by adding moisture. This is important as dry air can irritate the respiratory passages.

- Directional Flow: The nose also plays a role in directing the airflow during breathing. The shape and structure of the nasal passages help to optimize the flow of air into the respiratory system.

Conclusion
The nostrils and the nose work together to facilitate the process of breathing. While the nostrils allow air to enter the respiratory system and filter out harmful particles, the nose further conditions the air by warming, moistening, and directing the airflow. These functions ensure that the air we breathe is suitable for the respiratory system and contribute to overall respiratory health.

When we breathe in air, it passes through our nostrils. The slimy mucus present in it moistens the air. ... The mucus and hair present in the nostril catch the dirt, dust and disease-causing germs.