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I agree with the statement as humans
need to breathe in oxygen to live which then gets dissolved in the blood. It will then go to the hearts which will pump blood and the oxygenated blood will go to other parts of the body. The tissues will absorb the oxygenated blood and give out carbon dioxide so when we breathe out we will breathe out carbon dioxide

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Yan Lin, Aloysius, Megan Tan, Sharvath (2)

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Your video explanation should answer the following questions:
(1) What does each part of your lung model represent in the respiratory system?
(2) What is the order of parts by which air enters and exits the lungs?
(3) How is the air we breathe in different from the air we breathe out and why?

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(A) Describe how air enters and exits the lungs, and describe how inhaled and exhale air is different.

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(A) Describe how air enters and exits the lungs, and describe how inhaled and exhale air is different.

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Write your name in the subject heading, and your answer below.

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(B) Humans breathe in oxygen and breathe out carbon dioxide

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(B) Humans breathe in oxygen and breathe out carbon dioxide

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Write down whether or not you agree with the statement above and explain why. Write your name in the subject heading.

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I disagree with the statement because we breathe in air which is a mixture of different gases, e.g. oxygen, nitrogen, carbon dioxide and other gases. So when we breathe in, the air goes down our windpipe and to our lungs. When we breathe out, the air goes up our windpipe and out of the nose.

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Nice to see that you guys managed to "fix" the model by joining the mid-section back and get it to work. Are you able to explain how air enters and exits the lungs? Also, how is the inhaled and exhaled air different?

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Thank you for introducing yourselves - it helped me identify you. Your explanation is clear and comprehensive. However, you mentioned that "oxygen is pumped back to the heart" - how does that happen? I thought so far, air has only entered the lungs. How does the oxygen in the air get pumped to the heart?

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I really like your very concise video which answers the first 2 questions completely. I noted from the iPad that the team had rehearsed multiple times before choosing a "best run".

The video does not answer how or why the inhaled and exhaled air is different though.

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Your video did not answer question 1, and I felt question 2 was not so clearly answered. However, you guys answered question 3. :)

Is it the nose/mouth that is responsible for humans' breathing, or is it the diaphragm? We should discuss this again.

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I do not agree with this statement because the nose breathes in all kinds of gases, not just oxygen, and hence would also breathe out all those other other gases excluding some oxygen, not just carbon dioxide.

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What does the plastic bag represent? How exactly do we breathe - is the diaphragm or the nose responsible for bringing air into our lungs? Also, how is inhaled and exhaled air different?

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I agree with this statment because carbon dioxide, a waste gas, is not essential to your body but oxygen, on the other hand, is important for your body as it is needed to turn food into energy.

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I disagree, because humans can also breathe in other types of air,  just that it is not healthy for humans to breathe. For example, humans can breathe in helium, but it is not healthy as it makes your voice squeaky; we can breathe in smoke, but it is not healthy for our lungs. Hence, I disagree with the statement about humans breathing in oxygen and breathing out carbon dioxide. 🤗🤗

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Does the air go in because the diaphragm relaxes, or does the diaphragm relaxes because the air goes in? What causes what?

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I disagree with this statement as we not only breathe out carbon dioxide but we also breathe other air

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I do not agree with the statement as when you inhale, the diaphragm is pulled downwards which causes air to enter the nose which then goes through the windpipe and into the lungs. The hai in the nose and mucus traps dust to make sure that the air we breathe in is somewhat clean and too much dust doesn't enter the lungs. When air, consisting of nitrogen, oxygen, carbon dioxide, water vapour and other gases enters the lungs, only some oxygen enters the blood through the air sacs which is transported to all parts of the body through the blood vessels (arteries).

When you exhale, the air in the deoxygenated blood is transported to the heart which is then pumped to the lungs where some carbon dioxide is removed form the blood. This air is warmer and has more water vapour and carbon dioxide. The diaphragm then moves upwards and air is forced out of the lungs, windpipe and out of the nose.

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I do not agree with this statement because there is always some nitrogen in the air that we breathe in and out 

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I do not agree with this statement because there is always some nitrogen in the air that we breathe in and out 

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Kathryn

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I disagree because we breathe in air which contains nitrogen, carbon dioxide and many another gases besides oxygen.
The air that we breathe out contains other gases except oxygen besides carbon dioxide.

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Dear Bi Fang, Selvi, Madeleine and Chenxi, I understand that you guys were absent for last week's lesson. Please view your friend's video explanation of the "lung model" which explains how we breathe in and out, and then based on the comments and explanations, try to answer EITHER question (A) or (B). Thank you!

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A) we breathe in with our nose and into the wind pipe then to the lungs

B) I agree since carbon dioxide is a waste gas but oxygen is a useful gas

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(A) When you inhale, the diaphragm goes down and air enters the nose, through the windpipe and into the lungs. The nose hair and mucus makes sure that the air is clean and dust won't enter the lungs. When air, consisting of nitrogen, oxygen, carbon dioxide, water vapour and other gases enters the lungs, only some oxygen enters the blood which is transported to all parts of the body through the blood veins of the circulatory system. When you exhale, the air goes out of the lungs, the windpipe and the nose. This air consists of the same amount of nitrogen, lesser oxygen, more carbon dioxide, more water vapour and the same amount of other gases.

(B) That statement is false. This is because air is an mixture of nitrogen, oxygen, carbon dioxide, water vapour and other gases. When you inhale, the air, not only oxygen but also other gases enters the nose, through the windpipe and into the lungs. When you exhale, the air, not only carbon dioxide but also other gases goes up the windpipe and out of the nose.

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B) I do not agree with this as humans breathe in air, which is a mixture of gases such as nitrogen, oxygen, and other gases. The air we breathe in contains nitrogen, oxygen, carbon dioxide, water vapour and other gases. The air we breathe out contains the same amount of nitrogen, less oxygen, more carbon dioxide, more water vapour and is warmer.

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(A) Air enters the lungs through the process of inhalation, where the diaphragm and intercostal muscles contract, expanding the chest cavity and creating a pressure gradient that allows air to flow in. During exhalation, the diaphragm and intercostal muscles relax, reducing the chest cavity's size and causing air to be expelled from the lungs. Inhaled air contains more oxygen and less carbon dioxide, while exhaled air contains less oxygen and more carbon dioxide.
(B) i agree with the statement because humans inhale oxygen during respiration and exhale carbon dioxide as a waste product.

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(A)

1) During inhalation(Breathing in), air enters the lungs. The process involves a few steps which are:
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Air Entry: Air enters through the nose or mouth, passes through the windpipe.
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Air Exits: Air flows from the higher pressure inside the lungs to the lower atmospheric pressure outside the body.

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Differences between inhaled air and exhaled air:
1) Oxygen content: Inhaled air contains a higher concentration of oxygen (approximately 21%) compared to exhaled air (approximately 16%)
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(B)
Air(nitrogen, oxygen and other gases) enters the body
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Air In The Lungs: Oxygen from that air moves to your blood. At the same time, carbon dioxide, a waste gas, moves from your blood to the lungs and is exhaled (breathed out).
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In the Body: The Arteries will transport the o2 (oxygen) to all parts of the body and the body will transport the co2 (carbon dioxide) to the Veins that will transports the blood the co2 to the lungs.
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In The Cell: The Mitochondria will receive the food and combine them that makes like a chemical reaction which creates energy and co2.
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Seng Ho!! :) :/

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I do not agree as humans breathe in air and breathe out nitrogen, carbon dioxide,water vapour and other gases

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i disagree because we breathe in more oxygen  less carbon dioxide and we breathe out  less oxygen more carbon dioxide

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I don't agree with this statement.First of all,the nose can't decide if it wants a specific gas to enter.It only filters out dust particles in the air with nose hairs and mucus only.Second,humans breathe in both oxygen and carbon dioxide,but when we breathe out,there is a lesser percentage of carbon dioxide than before.

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As my we inhale by our nose, air travels down by our windpipe and then our lungs take in oxygen and remove the carbon dioxide. We then exhale the carbon dioxide?.

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Yes, but the “air” we breathe in is a mixture of different gases eg. Oxygen, carbon dioxide,water vapour and etc.

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I don’t agree , the nose cannot choose which is taken in

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B)

When we inhale, our diaphragm moves downwards and air enters through our nose or mouth and goes to the windpipe, then the lung but when we exhale, our diaphragm flattens to let air go out of our lungs.

A)

I do not agree as we don't only breathe in oxygen but we breathe in air which consists of different gases, the same thing for when we breathe out just carbon dioxide as there other gases too.

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I don't agree with the statement as humans breath in air and air is a mixture of gases and contains not only oxygen but also carbon dioxide nitrogen water vapour and other gases and so therefor you breath out the same things

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(B) Do not agree because air contains such as nitrogen, helium and other gases

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I don’t agree because we only breathe in air and breathe out air

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I disagree. Humans breathe in air which does not only contain oxygen, but also carbon dioxide, nitrogen etc. When we breathe out, it is also air and not carbon dioxide only.

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(B) I agree because humans do indeed breathe in oxygen and exhale carbon dioxide. This is a result of the process of respiration where oxygen is taken in by the lungs and used by the body's cells, while carbon dioxide is produced as a waste product and expelled during exhalation.

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I Disagree
Because when we breath in air. We will breath out air

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We breathe in oxygen through our nose , down the windpipe and into the lunges. The lunges then makes an exchange of gases, causing us to exhale carbon dioxide.

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(Frist part）Frist the diaghram move down，the rib cage move out and upwards and the chest expand， air rushes in thought the nose and mouth to the windpipe and the windpipe transport the air to the air tubes, it is then finally tansport  into the lungs
(Third part)The diaghram move up and the rib cage move in and downwards, chest contract air rushes out from the lungs into the air tube then it is transport to the widpipe .Finally it is tansport to the noes and mouth to breathe it out
breathe in air VS breathe out air :
air got less heat VS air got more heat
air got less carbon dioxide VS air got more carbon dioxide
air got more oxygen VS air got less oxygen

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I do not agree with that statement because you breathe out nitrogen but not all of it.
Megan siman

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The air we breath in only enters to the lungs

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(A) Air enters the lungs through inhalation and exits through exhalation. Inhaled air has more oxygen and less carbon dioxide, while exhaled air has less oxygen and more carbon dioxide.

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A)Air enters into the lungs through inhalation and exits through exhalation.Inhaled air has more oxygen and less carbon dioxide while exhaled air has less oxygen and more carbon dioxide.
B(The statement is incorrect.Because,air is a mixture of nitrogen,oxygen,carbon dioxide,water vapour and there types of gases.When you inhale the air not only oxygen but also other gases enters the nose through the windpipe and into the lungs.When you exhale the air not only carbon dioxide,also other gases goes up into the windpipe out through the nose

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(B)I agree because the lungs and respiratory system allow us to breathe. They bring oxygen into our bodies (called inspiration, or inhalation) and send carbon dioxide out (called expiration, or exhalation). This exchange of oxygen and carbon dioxide is called respiration.