"Gas Exchange Occurring in the Lungs" Human Respiration PPT Courseware 2

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"Gas Exchange Occurring in the Lungs" Human Respiration PPT Courseware 2

location of lungs

Located in the chest, one on each side, the left and right bronchi enter the left and right lungs respectively.

The thorax is made up of bones and muscles, and the thoracic cavity is the cavity surrounded by the rib cage.

The lungs are the main organs of the respiratory system. The lungs inhale and exhale rhythmically, approximately 16 times per minute.

Bust difference = Bust length at the end of inhalation – Bust length at the end of exhalation

Example 1: A classmate’s chest circumference is 80 centimeters. When he inhales as deeply as he can, his chest circumference is 90 centimeters. When he exhales as hard as he can, his chest circumference is 78 centimeters. His chest circumference is ______.

Example 2: During the school physical examination, classmate Xiao Ming’s chest circumference differed three times and the results were: 11cm, 9cm, and 10cm. I would like to ask: Xiao Ming’s bust difference should be ( )

A 11cm B 9cm C 10cm D 9.5cm

discuss:

How do the intercostal muscles and diaphragm move when air is inhaled and exhaled? How does thoracic volume change?

When inhaling, the diaphragm contracts, the top of the diaphragm descends, and the upper and lower diameter of the chest increases.

When exhaling, the diaphragm relaxes, the top of the diaphragm rises, and the upper and lower diameter of the chest decreases.

Students who know how to swim will tell you that when you first enter the water, if the water exceeds your chest. How do you feel? Why?

In ancient times, some women tied their chests and waists tightly to maintain a slim figure, but their breathing was affected and their physical fitness declined. Why?

Please read the P50 data analysis

1. What does the different turbidity of limewater in bottles 1 and 2 mean?

The greater turbidity of the lime water in bottle 1 indicates that the exhaled gas contains more carbon dioxide.

The limewater in the 2 bottles is less turbid, indicating that the carbon dioxide content in the air is less;

2. Why are there two bottles in the experimental device? Contrast.

3. What is the difference between the gas exhaled by the human body and the gas in the environment? Why is there such a difference?

It can be seen through experiments:

In exhaled air, the oxygen content decreases and the carbon dioxide content increases. And this change occurs in the lungs.

Class exercises

1The route of gas entering the human body from the outside is ( )

A Nasal cavity Pharynx Larynx Trachea Bronchi Alveoli Extra-alveolar capillaries

B Nasal cavity Trachea Bronchi Alveoli Extra-alveolar capillaries

C Nasal cavity Pharynx Larynx Trachea Bronchi Alveoli

D nasal cavity pharynx larynx trachea bronchi

2. When an adult inhales calmly, the activity of respiratory muscles such as the external intercostal muscles and diaphragm and the changes in the thorax are ( )

A. The respiratory muscles contract, the ribs rise, the diaphragm roof descends, and the thorax expands. B. The respiratory muscles contract, the ribs rise, the diaphragm roof rises, and the thorax expands.

C The respiratory muscles relax, the ribs descend, the top of the diaphragm descends, and the thorax shrinks

D Respiratory muscles contract, the ribs descend, the diaphragm rises, and the thorax expands

3 The alveoli are surrounded by abundant capillaries, which is beneficial to (

A The lungs exchange gases with the outside world

B Gas exchange between alveoli and blood

C Gas transport in the blood

D Filtration, warmth and humidification of gases

4. The gas with the most content in the gas exhaled by people is ( )

A. Oxygen B. Carbon dioxide C. Nitrogen D. Carbon monoxide

5. For gas in the alveoli to enter the blood, it needs to pass through several layers of cells ( )

A. First floor B. Second floor C. Third floor D. Fourth floor

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For more information about the PPT courseware "Human Respiration Occurs in the Gas Exchange in the Lungs", please click the "Human Respiration ppt Gas Exchange Occurs in the Lungs" ppt tag.

"Gas Exchange Occurring in the Lungs" Human Respiration PPT Courseware 5:

"Gas Exchange Occurring in the Lungs" Human Respiration PPT Courseware 5 1. Gas exchange between the lungs and the outside world (ventilation of the lungs) Breathing Movement Inhalation Movement Exhalation Movement Press both sides of the chest with your hands, and inhale deeply. How do you feel your ribs move? How does the chest change...

"Gas Exchange Occurring in the Lungs" Human Respiration PPT Courseware 4:

"Gas Exchange Occurring in the Lungs" Human Respiration PPT Courseware 4 1: Gas Exchange between the Lungs and the Outside World Learning Objective: Summarize the gas exchange process between the lungs and the outside world by measuring the chest circumference difference, etc. Experimental measurement of chest circumference difference to explore whether the thoracic volume changes during respiratory movement..

"Gas Exchange Occurring in the Lungs" Human Respiration PPT Courseware 3:

"Gas Exchange Occurring in the Lungs" Human Breathing PPT Courseware 3 1. Experience and thinking about gas exchange between the lungs and the outside world. First, place your hands lightly on both ribs, take a deep breath and feel the relationship between the movement of the ribs and the changes in the thorax; then Place your hands gently on your sternum and take a deep breath.

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Update Time: 2024-11-22

This template belongs to biology courseware People's Education Press seventh grade biology book volume 2 industry PPT template

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