60 Questions
Which gas is removed from our bodies through gas exchange during respiration?
Carbon dioxide
What is the purpose of setting up the boiling tube in Experiment 7.12?
To observe the color change of the hydrogencarbonate indicator
What happens to the limewater in flask B and flask D when the vacuum pump is turned on in Checkpoint 7.6?
Limewater in flask B turns purple, limewater in flask D turns yellow
What is the main purpose of the human breathing system?
To provide oxygen to body cells
What is the function of the bronchioles in the breathing system?
To exchange gases at the air sacs
What is the texture of the pig's lungs?
Soft
How does the volume of the lungs change when air is pumped into them?
The volume increases
Which one of these is true about gas exchange in plants?
Gas exchange in plants is carried out through the stomata on the leaf epidermis.
What is the role of stomata in gas exchange in plants?
Stomata help in the uptake of carbon dioxide.
During photosynthesis, what happens to the rate of respiration in plants?
The rate of respiration decreases.
What is the net gas exchange in plants during the daytime?
Net uptake of carbon dioxide and net release of oxygen.
What happens to gas exchange in plants at night?
There is a net uptake of carbon dioxide and a net release of oxygen.
What is the purpose of using hydrogencarbonate indicator in Experiment 7.7?
To show any change in carbon dioxide content.
What does the hydrogencarbonate indicator show in Experiment 7.7?
Different colours in different carbon dioxide contents.
Which of the following statements about stomata is true?
Stomata control the opening and closing of guard cells.
What is the function of guard cells?
To control the opening and closing of stomata.
What happens to stomata at night?
They shrink as they lose water.
What is the main function of stomata?
To absorb carbon dioxide for photosynthesis.
What is the purpose of observing stomata under a microscope?
To observe gas exchange in plants.
What is the color of the cobalt chloride paper after breathing onto the mirror?
Pink
What can be concluded about the water vapor content of inhaled air compared to exhaled air?
Inhaled air contains less water vapor than exhaled air.
Which of the following correctly describes the process of gas exchange in humans?
Oxygen passes from the air sacs into the blood
What is the purpose of gas exchange in the lungs?
To supply oxygen to body cells and remove carbon dioxide from the body
Where does gas exchange take place in humans?
At the air sacs inside the lungs
What is the total surface area of the air sacs in our lungs?
The size of a tennis court
In which lungs do you think gas exchange is more effective, frog or human?
Human lungs
What happens to carbon dioxide during respiration?
It passes from the air sacs into the blood
What happens to oxygen during respiration?
It is carried by blood flowing to the lungs
What is the main purpose of pumping air into the lungs?
To increase lung volume
What is the effect of smoking on gas exchange in humans?
It decreases gas exchange
Which of the following is a function of the human breathing system?
Gas exchange
What is the purpose of setting up the boiling tube in Experiment 7.12?
To observe gas exchange in mealworms
What happens to the limewater in flask B and flask D when the vacuum pump is turned on in Checkpoint 7.6?
Limewater in flask B turns cloudy, limewater in flask D remains clear
What is the main purpose of gas exchange in the lungs?
To obtain oxygen and remove carbon dioxide
What is the texture of the pig's lungs?
Soft
Which gas is removed from our bodies through gas exchange during respiration?
Carbon dioxide
How does the volume of the lungs change when air is pumped into them?
The volume increases
Which of the following correctly describes gas exchange in plants?
Plants release oxygen and uptake carbon dioxide during photosynthesis
What is the purpose of using hydrogencarbonate indicator in Experiment 7.7?
To show any change in carbon dioxide content
What is the main function of stomata in plants?
To exchange gases with the environment
What happens to gas exchange in plants at night?
Gas exchange stops completely
Which of the following statements about gas exchange in humans is true?
Carbon dioxide is released and oxygen is taken in during inhalation
What is the main purpose of the human breathing system?
To supply the body with oxygen and remove carbon dioxide
What is the role of stomata in gas exchange in plants?
To exchange gases with the environment
Which of the following best describes the function of stomata in plants?
To exchange gases with the atmosphere
What happens to stomata at night?
They shrink as they lose water
What is the purpose of observing stomata under a microscope?
To measure the size of stomata
What is the main purpose of the human breathing system?
To take in oxygen and release carbon dioxide
What is the effect of smoking on gas exchange in humans?
It damages the alveoli, reducing gas exchange
What is the net gas exchange in plants during the daytime?
They take in more carbon dioxide than they release
What happens to the limewater in flask B and flask D when the vacuum pump is turned on in Checkpoint 7.6?
The limewater in flask B turns cloudy, but the limewater in flask D remains clear
Which of the following is true about gas exchange in humans?
Gas exchange takes place between the air sacs and the surrounding capillaries.
What is the total surface area of the air sacs in our lungs?
Approximately the size of a tennis court.
What is the main function of stomata in plants?
To allow for gas exchange.
What is the effect of smoking on gas exchange in humans?
It decreases the efficiency of gas exchange.
Where does gas exchange take place in humans?
In the alveoli.
What does gas exchange in humans allow for?
Continuous supply of oxygen to the body cells.
What is the purpose of observing lung tissue in water?
To determine if it floats or sinks.
Which of the following correctly describes the process of gas exchange in humans?
Oxygen passes from the air sacs into the blood, while carbon dioxide passes from the blood into the air sacs.
What is the structure responsible for gas exchange in humans?
Alveoli.
Study Notes
Respiration and Gas Exchange
- Carbon dioxide is removed from our bodies through gas exchange during respiration.
- The main purpose of the human breathing system is to take in oxygen and expel carbon dioxide.
Experiment 7.12
- The boiling tube is set up to collect and measure the volume of carbon dioxide produced during respiration.
Gas Exchange in Plants
- Gas exchange in plants occurs through stomata, which are small openings on the surface of leaves.
- The main function of stomata is to regulate gas exchange by opening and closing.
- During the daytime, the net gas exchange in plants is a net gain of oxygen and release of carbon dioxide.
- At night, gas exchange is reversed, and plants release oxygen and absorb carbon dioxide.
Stomata
- Guard cells surround stomata and control their opening and closing.
- Stomata observe a daily rhythm, opening during the day and closing at night.
- The main purpose of observing stomata under a microscope is to understand their structure and function.
Lung Structure and Function
- The bronchioles are responsible for directing air into the air sacs where gas exchange takes place.
- The texture of the pig's lungs is spongy and highly vascularized.
- When air is pumped into the lungs, their volume increases.
Gas Exchange in Humans
- Gas exchange takes place in the alveoli, tiny air sacs within the lungs.
- The total surface area of the air sacs in our lungs is approximately 70 square meters.
- Gas exchange in humans allows for the exchange of oxygen and carbon dioxide between the lungs and bloodstream.
- The structure responsible for gas exchange in humans is the alveoli.
Effects of Smoking
- Smoking has a negative effect on gas exchange in humans, reducing lung function and efficiency.
Discovering Gas Exchange in Animals: Join us in Experiment 7.12 as we explore how artificial respiration can save lives by studying the gas exchange process in different animals. Watch the informative video ev07s12 to learn more!
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