The outside air enters the lungs after being processed by the respiratory tract, where it is exchang

The respiratory system includes two parts: the respiratory tract and the lungs The composition of the respiratory tract from top to bottom is the nose, pharynx, larynx, trachea and bronchi, there are nasal hairs in the nasal cavity, which can block dust, and the respiratory tract has bone or cartilage as a scaffold, and its inner surface is covered with mucosa, and there are abundant capillaries in the mucosa These characteristics not only ensure the smooth flow of gas, but also have a clean, warm and moist effect on the inhaled air; The lungs are the place of gas exchange, the main organ of the respiratory system, the inhaled gas is exchanged between the lungs and the blood, and the gas always diffuses from the place with high concentration to the place with low concentration until it is balanced; The alveoli contain more oxygen than in the blood, while carbon dioxide contains less than in the blood; As a result, oxygen diffuses from the alveoli into the bloodstream, and dioxide <>

When blood flows through the capillaries outside the alveoli, because the concentration of oxygen in the alveoli is higher than that in the blood, and the concentration of carbon dioxide is lower than that in the blood, the oxygen diffuses from the alveoli to the blood, and carbon dioxide diffuses from the blood to the alveoli, so that the blood changes from venous blood to arterial blood

So the answer is: in the lungs; Blood

The exchange of gases between the lungs and the outside world.

The outside air enters the lungs after being treated by the respiratory tract, and the gas exchange is carried out between the alveoli and the blood burning fluid: the gas always diffuses from the place of high concentration to the place of low concentration until it is equilibrate; When blood flows through the capillaries outside the alveoli, because the concentration of oxygen in the alveoli is higher than that in the blood, the concentration of carbon dioxide is lower than that in the blood, so the oxygen diffuses from the alveoli to the blood, and carbon dioxide diffuses from the blood to the alveoli, so that the blood changes from venous blood to arterial blood

So the answer is: between the blood

The process by which the lungs exchange gases with the outside world is called breathing exercise. A is true B is false.

Answer: B Analysis: The process of gas exchange between the lungs and the outside world, that is, the process of lung ventilation, is achieved through respiratory movements, not respiratory movements.

(1) When the person inhales, the piston A (open) and the piston B (close);

2) When the person exhales, the piston A (close the plug) and the piston B (open);

3) The function of the reagent in the bottle is (to remove CO2 from the air);

The purpose of the reagent in the bottle is to check whether there is CO2 in the exhaled breath of the person.

Let's start with the role of two Erlenmeyer flasks. Erlenmeyer flask one is for.

Go out and suck in the carbon dioxide in the air to eliminate dry interference. Erlenmeyer flask 2 is to verify that the product of human metabolism is carbon dioxide.

When the person inhales, the piston B is closed, the piston A is opened, and the air enters through the long tube on the left in (1), and the long tube is used to pass the air into the clarified lime water and remove the carbon dioxide in the air. Entering the human body through the short tube in (1); When the person exhales, open the piston B, close the piston A, and the exhaled gas enters the clarified lime water through the long tube in (2) to check whether carbon dioxide is produced, and the remaining gas is discharged from the short tube in (2).

Clear from the air.

bai carbon dioxide (will be empty in the gas of two.

Only when the carbon dioxide is removed can we ensure that the carbon dioxide that appears in the later DAO is produced by respiration and not in the air).

It is proved that the carbon dioxide produced by breathing (carbon dioxide and clarified lime water become turbid) has a clip on each side of the rubber stopper, and when inhaling, the left side is opened and the right side is closed, and the gas is inhaled from the left side, and the carbon dioxide in the air is removed through one bottle. Then close the left side and open the right clip, exhale, the exhaled air enters the right Erlenmeyer flask, the lime water is cloudy, indicating that there is carbon dioxide in the exhaled gas.

Let me tell you, because when the A bottle is inhaled, the external pressure will push the gas into the bottle, and if the bottle is CO2, then the CO2 from the outside world will be pressed over, and the inside of the bottle will become turbid.

When the person inhales, close the piston B, open the piston A, and the empty gas enters through the long tube on the left in (1), which is used to pass air into the water of the clarified stone ash and remove the carbon dioxide in the air. Yu Dan enters the human body through the short tube in (1); When the person exhales, open the piston B, close the piston A, and the exhaled gas enters the clarified lime water through the long tube in (2) to check whether carbon dioxide is produced, and the remaining gas is discharged from the short tube in (2). Therefore, the length of the four catheters should be different and should not be reversed.

Solution: (1) When inhaling, the carbon dioxide present in the mixed gas should be removed, so it is necessary to let the inhaled gas enter through the plate I bottle

So the answer is: the right to open and close

2) When inhaling, it is necessary to prove that carbon dioxide is generated, so the exhaled gas needs to pass II, and the phenomenon of carbon dioxide is that the lime water becomes turbid

So the answer is: close; Open it; Clarified lime water becomes turbid

3) I and II devices are different, i is a device for inhaling gas, and II is a device for exhaling air, so their functions are removal and verification, respectively

So the answer is: remove carbon dioxide from the air; Proof that the breath exhaled by the person contains carbon dioxide

(1) When the person inhales, the piston A should be opened.

Piston B is closed.

2) When a person exhales, the piston plate A should be closed, and the piston B is opened, and the phenomenon in the bottle can be observed at this time: the clarified lime water becomes turbid (3) The function of the reagent in the bottle is to remove carbon dioxide from the air The function of the reagent in the bottle is to prove that the gas exhaled by the person contains carbon dioxide.

I have done this, bottle A is clarified lime water to prove the carbon dioxide content of the gas inhaled into the body, and bottle B is to prove the carbon dioxide content of the gas inhaled into the human body. (3) The first void is not that, but I draw out the gas in the bottle and introduce air with the conduit of the side.

Let me tell you, because when you inhale in bottle A, bottle A runs out of air, and the pressure from the outside world will push the gas into the bottle, and if the bottle is CO2, then the CO2 from the outside world will be pressed over, and the inside of the bottle will become turbid.

If the CO2 in the air is not removed, the results of the experiment cannot prove that the turbidity in II is the CO2 exhaled by humans.

It proves that the carbon dioxide contained in the exhaled breath does not come from the air, but is a product of the body's metabolism.

Otherwise, it will be confused with the original inhaled gas.

The respiratory system includes two parts: the respiratory tract and the lungs The composition of the respiratory tract from top to bottom is the nasal cavity, pharynx, larynx, trachea and bronchi, and the outside air enters the lungs through the nasal cavity, pharynx, larynx, trachea and bronchi, and finally enters the lungs, and completes the gas exchange in the lungs There are nasal hairs in the nasal cavity, which can block dust, and the respiratory tract has bone or cartilage as a scaffold, and its inner surface is covered with mucosa, and there are abundant capillaries in the mucosa These characteristics not only ensure the smooth flow of gas, but also have a clean, warm and moist effects; The lungs are the site of gas exchange and are the main organs of the respiratory system

So the answer is: nasal; Pharynx; Larynx; Trachea; Bronchus; Lungs;