"Gas Exchange between the Human Body and the External Environment" PPT

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"Gas Exchange between the Human Body and the External Environment" PPT

Part One: Introduction of New Course

1. The baby in the picture on the left is born and needs to breathe when it cries for the first time.

2. The diver in the picture on the right should carefully check his breathing apparatus before entering the water.

learning target

1. Describe the components of the human respiratory system.

2. Explain the relationship between the structure and function of the respiratory system.

3. Explain the structural characteristics of alveoli that are suitable for their functions.

Gas exchange between the human body and the external environment PPT, Part 2: Composition of the respiratory system

Observe the schematic diagram of the respiratory system and describe the components of the respiratory system

Nose - the beginning of the respiratory tract

Nose hairs – block dust

Mucous membranes – clean and moist

Capillaries in mucous membranes – warm inhaled air

trachea and bronchi

(1) Use C-shaped cartilage as a scaffold to allow air to flow smoothly

(2) Mucus glands secrete mucus:

Clings to dust; moist, clean air

(3) The cilia on the inner surface of the tube wall swing, and dust particles, germs and mucus (phlegm) are discharged through coughing.

Gas exchange between the human body and the external environment PPT, Part 3: Cooperation and communication

What organs make up the passage of gas into and out of the lungs? Why do you think the air entering the lungs becomes clean, warm, and moist?

The channels for gas to enter and leave the lungs are composed of the nose, pharynx, larynx, trachea, bronchi and other organs

Lung structure and function

The lungs are the main organ of the respiratory system and the place where gases are exchanged

Location: The lungs are located in the chest, one on each side. The left lung is divided into two lobes, and the right lung is divided into three lobes.

Features of the lungs suitable for gas exchange:

1. The number of alveoli is large and the total area is large.

2. There are abundant capillaries outside the alveoli. The capillary walls are very thin and composed of a layer of epithelial cells.

3. The alveolar wall is very thin and consists of only one layer of epithelial cells.

Gas exchange between the human body and the external environment PPT, Part 4: Feedback in class

1. In the following structure, the common channel for gas and food is ( )

A. Oral cavity B. Pharynx C. Larynx D. Esophagus

2.The main organ of the respiratory system is ( )

A. Nasal cavity B. Lungs C. Larynx D. Trachea

3. Which of the following is a characteristic of alveoli suitable for gas exchange ( )

A. The alveolar wall is composed of a layer of epithelial cells

B. There are many alveoli and the total area is large

C. There are capillaries wrapped around the alveoli.

D. All three of the above

Keywords: Jiangsu Education Edition seventh grade biology PPT courseware free download, gas exchange between the human body and the external environment PPT download, .PPT format;

For more information about the PPT courseware "Gas Exchange between the Human Body and the External Environment", please click on the Gas Exchange between the Human Body and the External Environment ppt tag.

"Gas Exchange between the Human Body and the External Environment" PPT courseware:

The content of the first part of the PPT courseware "Gas Exchange between the Human Body and the External Environment": New lesson introduction: The child did not cry after birth. The doctor was so anxious that he slapped his butt and made him cry. As a result, the father of the child took the doctor to court. Child abuse! Please let the students decide...

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Update Time: 2024-09-08

This template belongs to biology courseware Jiangsu Education Edition Seventh Grade Biology Volume 2 industry PPT template

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