What does the upper respiratory tract include?

The upper respiratory tract is an important part of our body, mainly including the nasal cavity, pharynx and larynx. These structures form the passage for air to enter the lungs and help us breathe normally. You can imagine it as a complex pipeline system that is responsible for filtering, humidifying and warming the air, making the air we inhale more suitable for the needs of the lungs.

Start with the nasal cavity, which is the first stop for air entering the respiratory tract. The nasal cavity is not only the main organ of our sense of smell, but also acts as an air "purifier". Nasal hair and mucus can block dust and microorganisms and prevent them from entering the lower respiratory tract. Next is the pharynx, which is a passage connecting the nasal cavity and the throat. The pharynx is not only part of breathing, but also involved in swallowing and phonation. Imagine that the pharynx is like a multifunctional "crossroads" that ensures that air and food each go their own way.

The larynx is the last part of the upper respiratory tract, located between the pharynx and the trachea. Its main function is to protect the trachea from food and liquid entering the lungs, and it is also home to the vocal cords. The larynx acts like a "gatekeeper," closing the passage when you swallow to prevent foreign matter from entering the trachea.

Understanding the structure and function of the upper respiratory tract can help us better protect ourselves. For example, keeping the nasal cavity moist can reduce the risk of infection, and avoiding inhaling harmful substances can protect the health of our throat. When you feel a sore throat or nasal congestion, it may be the upper respiratory tract sending you an alarm, reminding you that you may need to rest or see a doctor.

In daily life, good habits such as washing hands frequently, keeping indoor air circulation and avoiding smoking can help us maintain the health of our upper respiratory tract. Remember, the upper respiratory tract is our body's first line of defense against the external environment. Protecting it is protecting our health. I hope this information can give you a clearer understanding of the upper respiratory tract and help you take better care of yourself in daily life.