"Gas Exchange Occurring in the Lungs" Human Respiration PPT Courseware 4

Description

"Gas Exchange Occurring in the Lungs" Human Respiration PPT Courseware 4

1: Gas exchange between the lungs and the outside world

Learning objectives: By measuring the chest circumference difference, etc., outline the gas exchange process between the lungs and the outside world.

Experiment - Measuring the Bust Girth Difference

To explore whether the thoracic volume changes during respiratory movement, it can be done by measuring the chest circumference difference.

Thinking, summarizing

Bust girth difference = the difference between the bust length at the end of inhalation and the bust length at the end of exhalation.

summary

The lateral expansion and contraction of the thorax is the result of the contraction and relaxation of the intercostal muscles.

Changes in thoracic volume are also related to the activity of the diaphragm. The diaphragm contracts and the top of the diaphragm descends, causing the upper and lower diameters of the thorax to also increase. When exhaling, the diaphragm relaxes, the top of the diaphragm rises, and the upper and lower diameters of the thorax decrease.

Can you summarize the principles of breathing exercise?

The principle of breathing exercise:

The lungs are elastic. When the muscles between the ribs and the diaphragm contract to expand the volume of the chest cavity, the lungs expand, and the gas pressure in the lungs decreases accordingly, so the gas is inhaled. When the muscles between the ribs and the diaphragm relax, the volume of the chest cavity shrinks. The lungs contract, the gas pressure in the lungs increases accordingly, and the gas is expelled.

1. Figure 1: Represents the movement of respiratory muscles. Answer the questions based on the picture.

(1) Fill in the name indicated by the horizontal line in the picture.

(2) The picture on the left shows the ______ gas process. At this time, the intercostal muscles ______ (contract or relax), which increases the ______ of the chest, and the diaphragm ______ (contracts or relaxes), which increases the ____________ of the chest. Large, at this time, the chest volume ______, the lungs ______, the gas pressure in the lungs corresponds to ______, and external air enters the lungs.

(3) The picture on the right shows the process of ______ exhalation. At this time, the intercostal muscles and diaphragm are ______, so that the chest volume ______, the lungs ______, the gas pressure in the lungs ______, and the exhalation is completed.

2. Figure 2: To simulate the movement of the diaphragm, answer the questions based on the picture.

(1) Fill in the name of the structure represented by the horizontal line.

(2) The picture on the left represents the state of ______ Qi, and the picture on the right represents the state of ______ Qi; in the state of the picture on the right, the diaphragm is in a ______ (contraction or relaxation) state.

(3) The two figures together represent the process of gas exchange between the lungs and ______.

Data Analysis – Discussion:

1. What does the different turbidity of the limewater in bottles A and B mean?

2. Why is bottle A needed for this experiment?

3. What is the difference between the gas exhaled by the human body and the gas in the environment? Why is there such a difference?

Summary:

The exhaled gas changes in composition: the oxygen content decreases and the carbon dioxide content increases.

Discuss in groups and answer the following questions:

1. What are the characteristics of alveoli suitable for gas exchange with blood?

①The alveoli are surrounded by abundant capillaries;

②The number of alveoli is large;

③The alveolar wall and capillary wall are both a layer of flat epithelial cells.

2. Outline the gas exchange process between alveoli and blood?

When inhaling, oxygen in the air enters the blood through the alveolar walls and capillary walls; at the same time, carbon dioxide in the blood also enters the alveoli through the capillary walls and alveolar walls, and is then excreted out of the body during exhalation.

1. The gas with the most content in the gas exhaled by people is ( )

A. Oxygen B. Carbon dioxide C. Nitrogen D. Carbon monoxide

2. There is a rich capillary network wrapped around the alveoli. This ( )

A. Conducive to gas exchange between the lungs and the outside world

B. Conducive to gas exchange between alveoli and blood

C. Conducive to the transportation of gas in the blood

D. Not conducive to gas exchange

3. Gas in the alveoli needs to pass through several layers of cells before entering the blood ( )

A. First floor B. Second floor C. Third floor D. Fourth floor

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For more information about the PPT courseware "Human Respiration Occurs in the Gas Exchange in the Lungs", please click on the PPT tag of "Human Respiration PPT Occurs in the Lungs in Gas Exchange".

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"Gas Exchange Occurring in the Lungs" Human Respiration PPT Courseware 3:

"Gas Exchange Occurring in the Lungs" Human Respiration PPT Courseware 3 1. Experience and thinking about gas exchange between the lungs and the outside world. First, place your hands lightly on both ribs, take a deep breath and feel the relationship between the movement of the ribs and the changes in the thorax; then Place your hands gently on your sternum and take a deep breath.

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"Gas Exchange Occurring in the Lungs" Human Respiration PPT Courseware 2 The location of the lungs is located in the chest, one on the left and one on the left. The left and right bronchi enter the left and right lungs respectively. The thorax is made up of bones and muscles, and the thoracic cavity is the cavity surrounded by the rib cage. The lungs are the main part of the respiratory system..

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Update Time: 2024-09-07

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