"The Process of Human Cells Obtaining Oxygen" PPT courseware

Description

"The Process of Human Cells Obtaining Oxygen" PPT courseware

Part I: The respiratory tract and lungs form the respiratory system

(1) Respiratory tract - the channel through which gas enters and exits the lungs

1. nose

⑴ The nasal mucosa is rich in capillaries and mucus glands

Secrete mucus: Warm, moist, clean air, reduce lung irritation

⑵ There are olfactory cells on the nasal mucosa: sensing smells

Question: Where does the respiratory tract start? Is the nose the only way for gas to enter the body? Why is it better to breathe through your nose?

What are the benefits of having long noses in cold regions (such as Northern Europe)?

When the air is dry or the weather is hot, nosebleeds are easy to occur. What are the characteristics of the distribution of nasal blood vessels and what is its significance?

What structures in the nasal cavity filter the air?

Does the nose have other functions?

2. Pharynx: passageway for gas and food

3. Larynx: The passage for gas to enter the trachea. The epiglottis cartilage prevents food from entering the larynx. The vocal cords vibrate and produce sounds.

(2) Lungs - the place for gas exchange. The alveoli are suitable for gas exchange.

1. Large number of alveoli: as many as 300 million

2. Thin alveolar wall: one layer of cells

3. Abundant capillaries

4. Rich elastic fiber

think

1. What is pulmonary ventilation?

2. What is gas diffusion?

3. What does the thorax consist of?

4. What is lung ventilation?

5. Why does the surface of a blood clot appear bright red and the inner layer appears dark red?

6. What is tissue gas ventilation? Through what?

The process of human cells obtaining oxygen PPT, part 2 content: association and inspiration

The aroma of food from the kitchen will spread to the living room, and the blooming flowers will attract bees and butterflies.

Gas can move from places with high concentration to places with low concentration, which is gas diffusion.

So, how does the gas in the alveoli exchange with the outside gas?

tissue gas exchange

Tissue gas exchange is the exchange of oxygen and carbon dioxide between blood and cells. Cells consume oxygen and produce carbon dioxide during respiration, so that the oxygen concentration in the cells is lower than the oxygen concentration in the blood, and the carbon dioxide concentration is higher than the carbon dioxide concentration in the blood. Therefore, oxygen in the blood diffuses into the cells, and carbon dioxide in the cells diffuses into the blood, converting arterial blood into venous blood.

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 download:

"The Process of Human Cells Obtaining 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, and is where gas enters and exits the lungs.

"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..

File Info

Update Time: 2024-09-05

This template belongs to biology courseware Beijing Normal University Edition Seventh Grade Biology Volume 2 industry PPT template

Preview