"Gas Exchange between the Human Body and the External Environment" PPT courseware

"Gas Exchange between the Human Body and the External Environment" PPT courseware

Part One: Introduction of New Course

When the child didn't cry after birth, the doctor was so anxious that he slapped his butt to make him cry. As a result, the father of the child took the doctor to court for child abuse! Please ask the students to decide whether the doctor was wrong? Why?

learning target

1. Name the process of breathing movement.

2. Try to measure lung capacity using a spirometry test instrument.

PPT on gas exchange between the human body and the external environment, part 2: respiratory movement

What are breathing exercises

Respiratory movement refers to the rhythmic expansion and contraction of the human chest, including the inhalation and exhalation processes.

Gas exchange between the human body and the outside world is achieved through breathing movements.

discuss:

1. When the human body inhales, how does external air enter the lungs?

2. When the human body exhales, how is the gas in the lungs expelled from the body?

Inhalation: Muscle contraction tops down (large diameter), the volume is large, and the lung pressure is small

Exhalation: muscle tension rises (small diameter), volume is small, lung contraction pressure is large

Gas exchange between the human body and the external environment PPT, Part 3: Vital capacity

Vital capacity refers to the amount of air that can be exhaled after inhaling as hard as possible. It reflects the maximum ventilation capacity of a person's lungs during one breathing movement.

The size of a person's lung capacity is related to factors such as age, gender, body shape, and health status. The lung capacity of an adult is approximately 2500-4000mL.

Measure lung capacity

Purpose: Try to measure lung capacity using a spirometry machine.

Equipment: Spirometry tester

guide:

1. Ask the medical staff in the school clinic about the structure and use of each part of the spirometry tester.

2. Turn on the power of the spirometry tester, turn on the power switch, and press the confirmation button to clear.

3. The subject first took several deep breaths, then inhaled to the maximum, and then exhaled to the maximum through the mouthpiece of the spirometry tester. Record the vital capacity value displayed on the spirometry machine. Each person measured three times and recorded the amount of air exhaled each time. The maximum value was the subject's vital capacity.

Gas exchange between the human body and the external environment PPT, Part 4: Thoughts and discussions

1. Why is the maximum amount of exhaled gas obtained from three measurements the vital capacity?

Because vital capacity refers to the amount of air that can be exhaled after inhaling as hard as possible. It reflects the maximum ventilation capacity of a person's lungs in one breath, so the maximum value of 3 measurements is taken.

2. Why does the National Student Physical Health Standards stipulate measuring the vital capacity of middle school students?

Because vital capacity represents the maximum amount of functional activity of the lungs at one time, it is one of the important functional indicators that reflects the level of human growth and development. It reflects the strength of the lungs' working ability to a certain extent.

The lung capacity of adult men is significantly higher than that of women. Teenagers who regularly participate in physical exercise can improve their lung capacity.

Gas exchange between the human body and the external environment PPT, Part 5: Feedback in class

1. The main respiratory muscles of the human body are ( )

A. Pectoralis major and diaphragm B. Intercostal muscles and diaphragm

C. Latissimus dorsi and diaphragm D. Rectus abdominis and diaphragm

2. The relationship between lung changes and breathing is ( )

A. Exhalation caused by lung expansion B. Exhalation caused by lung contraction

C. Inhalation causes the lungs to expand D. Exhalation causes the lungs to expand

3. When the diaphragm contracts, which of the following statements is correct ( )

A. The top of the diaphragm rises and the upper and lower diameters of the thorax decrease.

B. The top of the diaphragm rises and the anteroposterior diameter of the thorax decreases.

C. The top of the diaphragm descends and the upper and lower diameters of the thorax increase.

D. The top of the diaphragm rises, and the anteroposterior diameter of the thorax remains unchanged.

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

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"Gas Exchange between the Human Body and the External Environment" PPT:

"Gas Exchange between the Human Body and the External Environment" PPT Part One Content: New Lesson Introduction 1. The baby in the picture on the left is born and needs to breathe when it cries for the first time. 2. The diver in the picture on the right should carefully check his breathing apparatus before entering the water. Learning Objectives 1. Describe people..