"Gas Exchange in the Human Body" PPT courseware

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"Gas Exchange in the Human Body" PPT courseware

Part One: Introduction of New Course

How do you feel about studying in an unventilated classroom for a long time?

Reason: The oxygen content in the air in the classroom decreases and the carbon dioxide content increases.

learning target

1. Overview the gas exchange process within the alveoli;

2. Outline the gas exchange process in tissues.

Gas exchange in the human body PPT, Part 2: Gas exchange in the human body

[Question] When the human body breathes, what happens to the oxygen and carbon dioxide content in the exhaled air and inhaled air?

Explore changes in carbon dioxide content during respiration

Purpose of study: To explore the changes in carbon dioxide content during human breathing.

Recommended equipment: beaker, clarified lime water, plastic tube, 75% alcohol by volume, absorbent cotton, ear cleaning ball, etc.

Inquiry Guide:

1. Students work in groups of 4 and read a student’s experimental steps on changes in the volume fraction of respiratory carbon dioxide:

(1) Pour the clarified lime water into the beaker.

(2) Use a plastic tube to blow air into the lime water several times.

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

2. Discuss in the group what are the main shortcomings of this student’s experiment?

3. The group puts forward suggestions for improvement and designs the group’s research plan.

4. The group implements the research plan and obtains experimental results.

5. Communicate with the whole class, draw experimental conclusions, and evaluate the innovations in each group’s exploration plan.

gas exchange in alveoli

Refers to the gas exchange between the alveoli (made up of alveolar cells) and the blood.

gas exchange in tissues

Refers to the gas exchange between tissue cells and blood

Gas exchange in the human body PPT, part 3: thinking and discussion

Sort according to the content of oxygen and carbon dioxide: arterial blood, venous blood, alveoli, tissue cells

Oxygen content:

Alveoli>Arterial blood>Venous blood>Tissue cells

CO2 content:

Tissue cells＞Venous blood＞Arterial blood＞Alveoli

Gas exchange in the human body PPT, part 4: feedback in class

1. Oxygen in the alveoli enters the blood due to ( )

A. The oxygen content in the alveoli is greater than the oxygen content in the blood.

B. The oxygen content in the alveoli is less than the oxygen content in the blood

C. The oxygen content in the alveoli is equal to the oxygen content in the blood

D. The oxygen content in the air is greater than the oxygen content in the lungs

2. There is an increase in carbon dioxide in the exhaled air. The increased carbon dioxide is produced by ( )

A.Alveoli

B. Capillaries outside the alveoli

C. blood

D. Tissue cells

3. The picture below shows the four major processes of human breathing. Please read the picture and fill in the blanks:

1.A represents ____ gas, B represents ________ gas, C represents ____ gas, and D represents ________ gas.

2. Two represents the _______________ process, and four represents _______________.

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

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"Gas Exchange in the Human Body" PPT:

"Gas Exchange in the Human Body" PPT Part 1 content: Learning objectives 1. Verify through experiments that exhaled gas contains more carbon dioxide 2. Understand the principle of gas exchange 3. State the gas exchange process in the human body 4. Describe the functions of the human body What does the breathing process include...

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Update Time: 2024-11-17

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

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