"The processing of air by the respiratory tract" Human Respiration PPT Courseware 3

"The processing of air by the respiratory tract" Human Respiration PPT Courseware 3

teaching objectives

1. Describe the components of the human respiratory system;

2. Understand the function of the respiratory tract;

3. Recognize that the respiratory tract’s ability to process air is limited.

Why do babies always come into the world crying?

The cry of a newborn baby marks the beginning of respiration, indicating that human life requires inhalation of air.

2. The role of respiratory tract

1. Read the data analysis on page 44, think about the discussion questions, and conduct group discussions.

(1). What structure does the respiratory tract have to ensure smooth airflow?

(2). In addition to ensuring smooth airflow, what other functions does the respiratory tract have? How are these achieved?

(3). With the respiratory tract processing the air, can the human body completely avoid the harm of harmful substances in the air?

(4). How is phlegm produced? Why can’t we spit everywhere?

(5). Winters in Northern Europe are very cold. What are the possible characteristics of the nose shapes of people living there compared to those living near the equator? Why?

Systematic induction, summary and improvement

1. Composition of the respiratory system:

It consists of the respiratory tract (nose, pharynx, larynx, trachea, bronchi) and lungs.

2. Function of respiratory tract:

It is a channel for gas to enter and exit, and it can also process the inhaled gas to make the gas that reaches the lungs warm, moist, and clean. The larynx also plays a role in producing sounds. The respiratory tract has a limited capacity to process air.

3. The relationship between breathing and swallowing

Breathing and swallowing cannot be done at the same time

Apply what you learn

1. Before giving artificial respiration to a drowning person, why should we first remove the dirt from his mouth and nose?

Before performing artificial respiration, remove dirt from the drowning person's mouth and nose. The purpose is to make the drowning person's nose, pharynx, and throat unobstructed to facilitate the air entering and exiting the lungs. Otherwise, air will easily enter the stomach, and when the air returns, it may cause the food in the stomach to regurgitate, causing respiratory tract obstruction and causing suffocation.

2. How are acute bronchitis and pneumonia caused by bacteria and viruses spread?

Acute bronchitis and pneumonia are mainly spread through breathing and droplets. The "journey" that these pathogenic microorganisms take to reach the patient's disease site is: outside air → nose → pharynx → larynx → trachea and bronchi (pneumonia reaches the lungs).

5. Consolidate practice and apply what you have learned

①The components of the human respiratory system should be arranged in order:

A. Nasopharynx Larynx Bronchus Trachea Lungs

B． nose throat pharynx trachea bronchi lungs

C. Nose Mouth Pharynx Larynx Trachea Bronchi

D. Nasopharynx Larynx Trachea Bronchi Lungs

② Each of the following examples attempts to discuss the advantages of breathing through the nose, but one item is incorrect. It should be:

A. Olfactory cells in the nasal mucosa can sense odor stimulation

B． The nasal mucosa is rich in capillaries and can warm the cold air inhaled

C. Nose hairs can block dust in the air you breathe in

D. The nasal mucosa secretes mucus to clean and moisten the inhaled air

③If you eat while talking and laughing, food can easily enter the trachea. The reason is:

A. The epiglottis cartilage fails to cover the entrance to the larynx

B. Airflow impact, laryngeal cavity expansion

C. Airflow impact, glottis cracked widely

D. Enlargement of cricoid cartilage

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