"The process by which human cells obtain oxygen" PPT download

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"The process by which human cells obtain oxygen" PPT download

Part One: Course Knowledge Points

Knowledge point 1: The respiratory tract and lungs form the respiratory system

The human respiratory system consists of the respiratory tract and lungs. The respiratory tract includes the nose, pharynx, larynx, trachea and bronchi. It is the passage for gas to enter and exit the lungs. The lungs are the place where gas exchange occurs between the human body and the outside world.

Knowledge point 2: Gas exchange between the lungs and the outside world is achieved through breathing movements

1. Pulmonary ventilation refers to the gas exchange between the outside world and the alveoli, which is commonly referred to as breathing, and is achieved through breathing movements.

2. The thorax is composed of the spine, ribs, sternum and intercostal muscles, and the bottom is closed by the diaphragm.

3. The movement of chest expansion and contraction is breathing movement, including the two processes of inhalation and exhalation.

4. The process of inhalation and exhalation

(1) Inhalation: Contraction of external intercostal muscles and diaphragm → Thoracic volume becomes larger → Lung volume becomes larger → Intra-pulmonary air pressure becomes smaller → Gas enters the lungs

(2) Exhalation: The external intercostal muscles and diaphragm relax → the thoracic volume becomes smaller → the lung volume becomes smaller → the air pressure in the lungs becomes larger → the gas leaves the lungs

Summary of rules (1) The external intercostal muscles and diaphragm always contract or relax at the same time.

(2) Due to the breathing movement, the pressure difference between the air pressure in the lungs and the external atmospheric pressure is formed, so that gas can enter and exit the lungs; at the moment when inhalation or exhalation is completed, the air pressure in the lungs is equal to the external atmospheric pressure.

The process of human cells obtaining oxygen PPT, part 2 content: exam points

Test point: Judgment about human breathing curve diagram

[Example] (2017·Shandong Weifang Simulation) The following figure is a synchronous change curve of lung volume during breathing. The section indicating that both the external intercostal muscles and the diaphragm are in a contracted state is ()

A.AC segment

B.BD segment

C.CD section

D.CE segment

Analysis When the external intercostal muscles and diaphragm contract, the volume of the thorax becomes larger, and the volume of the lungs also increases. In the figure, the lung volume of segment AC changes from small to large, and the external intercostal muscles and diaphragm are both in a contracted state in this section.

Answer A

PPT on the process of human cells obtaining oxygen, part three: detailed explanation of textbook questions

Demonstration of the "Model of Respiratory Movement" discussion question

1. According to the movement direction of the ribs and sternum when the intercostal muscles contract in model 1, analyze and explain how this movement of the ribs and sternum will cause changes in the thoracic volume.

It indicates that the intercostal muscles contract, the ribs are lifted and abducted, the sternum is moved upward, and the transverse diameter of the thorax is enlarged.

2. Based on the fact that the descent of the diaphragm roof causes changes in lung volume in model 2, analyze and explain the reasons for this change in lung volume.

It indicates that the diaphragm contracts, the top of the diaphragm descends, the longitudinal diameter of the thorax lengthens, the thorax expands, the lung volume expands, and external air enters the lungs (inhalation).

Keywords: Beijing Normal University Edition Biology PPT courseware for seventh grade volume 2 free download, PPT download of the process of human cells obtaining oxygen, .PPT format;

For more information about the PPT courseware "Energy Supply of the Human Body: The Process of Human Cells Obtaining Oxygen", please click the Energy Supply of the Human Body ppt: The Process of Obtaining Oxygen for Human Cells ppt tag.

"The Process of Human Cells Obtaining Oxygen" PPT courseware:

"The Process of Human Cells Obtaining Oxygen" PPT Courseware Part One Content: The respiratory tract and lungs form the respiratory system (1) The passage of respiratory gases in and out of the lungs 1. Nose ⑴ The nasal mucosa is rich in capillaries and mucus glands secreting mucus: warm and moist , clean space...

"The process by which human cells obtain oxygen" PPT:

"The Process of Human Cells Obtaining Oxygen" PPT Part One Content: Learning Objectives 1. Describe the composition of the human respiratory system and explain the relationship between the structure and function of the respiratory system. 2. Describe the principles of respiratory movement and pulmonary ventilation, and outline the interaction between human cells and the external environment..

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Update Time: 2024-09-08

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