"The entry and exit of gases in the human body" PPT courseware on the mystery of the human body

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"The entry and exit of gases in the human body" PPT courseware on the mystery of the human body

Read it and think about the following questions

1. What are the shortcomings of this student’s inquiry experiment in the textbook?

2. How does gas exchange occur in the alveoli?

3. How does gas exchange occur in tissues?

Changes in carbon dioxide volume fraction during respiration

Purpose of study: To explore the changes in carbon dioxide volume fraction during human breathing

Exploration equipment: beaker, clarified lime water, plastic tube, ear cleaning ball (rubber tip dropper)

Inquiry guidance: 1. Students work in groups of 8 and read a student’s experimental steps on how breathing changes the volume of carbon dioxide.

(1) Pour the clarified lime water into the beaker

(2) Use a plastic pipe to blow into the lime water several times continuously

(3) The clear lime water becomes turbid. It can be concluded that the gas exhaled by the human body contains more carbon dioxide

Why does the volume fraction of carbon dioxide change during breathing?

Compared with the inhaled gas, the volume fraction of oxygen and carbon dioxide changes significantly in the exhaled gas.

This is the result of gas exchange.

1. Gas exchange in alveoli

Alveoli Pulmonary capillaries

venous blood changes to arterial blood

2. Gas exchange in tissues

cells intertissue capillaries

Arterial blood changes to venous blood

Directly to the high school entrance examination

1. When the human body breathes, the most important part where the inhaled oxygen reaches and is utilized is ( ) (2010 Changde)

A. Lungs B. Blood C. Heart D. Cells

2. Compared with the gas inhaled, the main changes in the composition of the gas exhaled by the human body are ( ) (2009 Changde)

A. Oxygen increases and carbon dioxide decreases

B. Both oxygen and carbon dioxide decrease

C, oxygen and carbon dioxide both increase

D. Oxygen content decreases and carbon dioxide content increases

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For more information about the PPT courseware "The Mystery of the Human Body: The Inflow and Outflow of Gases in the Human Body", please click on the "The Mystery of the Human Body: The Inflow and Outflow of Gases in the Human Body" ppt tag.

"The Entry and Exit of Gases in the Human Body" Mysteries of the Human Body PPT Courseware 2:

"The Entry and Exit of Gases in the Human Body" Mysteries of the Human Body PPT Courseware 2 The function of the respiratory tract: The respiratory tract has bone or cartilage as a scaffold to ensure the smooth flow of gas in and out of the lungs. The capillaries in the nose warm the nose hairs and moisten the air. The mucus in the nose cleans the cilia in the trachea. trachea..

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Update Time: 2024-09-24

This template belongs to science courseware People's Education Press Sixth Grade Science Volume 1 industry PPT template

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