"Biological Respiration and Respiration" PPT

Description

"Biological Respiration and Respiration" PPT

Part One: Human gas exchange with the outside world through the respiratory system

Let’s talk about it in practical terms: What organs does the human respiratory system consist of? What are the functions of these organs? From a protection perspective, what bad habits should we be careful not to develop?

The nose, pharynx, larynx, trachea, and bronchi are collectively called the respiratory tract.

Lungs: Made up of a large number of alveoli.

components of respiratory system

Respiratory tract: passageway for gases to enter and leave the lungs

Lungs: the place where gases are exchanged

Biological respiration and respiration PPT, part 2: gas exchange between the outside world and the lungs (alveoli)

Breathing exercises:

The two actions of inhaling and exhaling together are breathing exercises.

Respiratory muscles: diaphragm and intercostal muscles

There are two types of intercostal muscles: the outer ones are called external intercostal muscles, and the inner ones are called internal intercostal muscles.

self experience

Press your left hand on your chest, inhale and exhale as hard as you can, and feel the movement of your sternum and ribs. How do you think the volume of the chest cavity changes? How does the air pressure inside the chest cavity change?

Biological respiration and respiration PPT, part 3: respiration and oxidation

What is the difference between the air a person exhales and the air he inhales?

When a person breathes, the oxygen in the exhaled air is much less than the oxygen in the inhaled air, and the carbon dioxide content is much increased.

Why do people consume oxygen and produce a large amount of carbon dioxide through respiration?

Because organic matter in human cells reacts with oxygen.

The organic matter in human cells reacts with oxygen, eventually producing carbon dioxide, water or other products, and at the same time releasing the energy in the organic matter to meet the needs of life activities. This process is a complex, multi-step process called respiration.

Biological respiration and respiration PPT, Part 4 content: Classroom exercises

1. The respiratory system consists of __________ and __________, of which __________ is the main organ of the respiratory system. The common channel for food and air is __________.

The function of the lungs is: a place where ＿＿＿＿ is carried out.

2. The outside world == alveoli

3. When inhaling, the thorax __, the air pressure in the cavity __, and the air flow __ the lungs; when exhaling, the thorax __, the air pressure in the cavity __, and the air flow __ the lungs.

4. Respiratory movement is caused by the __________ and __________ of the respiratory muscles; as a result of the respiratory movement, __________ is achieved.

5. There is a capillary network wrapped around the human alveoli, which is beneficial to ( )

A. Increase the area for gas exchange B. Gas exchange between the lungs and the outside world

C. Gas exchange between lungs and blood D. Transport of gases in blood

6. Which of the following is not a function of the nasal cavity ( )

A. Warm air B. Feel the smell

C. Sticking to dust D. Gas exchange

7. The annual "World No Tobacco Day" determined by the United Nations is ( )

A. January 1st B. April 1st

C. May 31st D. October 21st

Keywords: Zhejiang Education Edition eighth grade science PPT courseware for the second volume free download, biological respiration and respiration PPT download, .PPT format;

For more information about the "Biological Respiration and Respiration" PPT courseware, please click the "Biological Respiration and Respiration" ppt tag.

File Info

Update Time: 2024-10-14

This template belongs to science courseware Zhejiang Education Edition Eighth Grade Science Volume 2 industry PPT template

Preview