Questions tagged [breathing]

The physiological process of inhaling and exhaling air for the purpose of gas exchange in the lungs.

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-1 votes
1 answer
30 views

Can a school of 'suction cup' fish block the gills of a predator as a defence mechanism?

(This is about a FICTIONAL FISH - I MADE UP THE FISH. To my knowledge, this concept is not based on any real principles or precedents.) Now, this fish has a strong capability for suction, and very ...
-2 votes
1 answer
51 views

Compliance lung chest wall together

I do not understand compliance better why do the lung chestwall together system compliance is less than the individual compliance of lung and chest wall? shouldn’t it lie in middle? Please clear it.
0 votes
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86 views

How do whales swallow food underwater without drowning?

How do whales swallow food underwater without drowning? I know they have a valve that blocks the trachea while the mouth is open and that breathing is made from dorsal or parietal breathing holes or ...
1 vote
1 answer
50 views

Is the 5% of the oxygen used in the breathing process fully transformed into CO2?

More specific, I found out that the amount of oxygen we inspire is 21% from the total amount, with 0.04% CO2. The expired amount is 16% oxygen, with 4% CO2. Where does the remaining 1% oxygen go? Or ...
-1 votes
1 answer
95 views

max % of oxygen not harmful for breathing?

Is breathing pure oxygen bad for you? Human blood is designed to capture oxygen and safely bind it to a molecule known as hemoglobin. However, if you breathe in a high concentration of oxygen, it will ...
-3 votes
2 answers
222 views

Why can't fish extract oxygen from air?

I've read many posts here and elsewhere for example: Wikipedia where breathing is well described, but does not answer the question (or anything close.)# Wikipedia Gills, more specific, but still ...
-4 votes
1 answer
67 views

Is unihibited exhalation beneficial for someone with a contagious respiratory disease?

If someone has a contagious respiratory disease (I'll refer to as CRD - eg. COVID, FLU, etc.) I'm wondering if the process of exhaling could be beneficial for them. My first thought is that exhaling ...
16 votes
3 answers
32k views

What is the average speed of human sneeze?

I sneeze a lot, at various times and various "volumes", and often wonder about the speed of the sneeze itself, i.e. the speed of the air coming out of the nose while sneezing. What is the average ...
2 votes
1 answer
945 views

Why does exhaled air still contain oxygen?

If the partial pressure of oxygen in the atmosphere is 159 mmHg and that inside human alveoli is 104 mmHg, and if these values are fixed or don't change very much, then why does exhaled air have ...
2 votes
0 answers
125 views

How far does the diaphragm stretch when it contracts?

How far, exactly, does the diaphragm stretch during tidal breathing, and what is the maximum length it can stretch? I have been wondering about this for the entire day today, and I can't seem to find ...
5 votes
2 answers
933 views

What causes inhalation during breathing?

I have read here that the two major inhalation muscles are the (1) diaphragm and the (2) external intercostals. Additionally, inhalation can also be caused by (1) expansion of the abdominal cavity, ...
1 vote
1 answer
95 views

Are there any "good" gases which "accidentally" diffuse into the lungs and get exhaled?

The purpose of breathing is to bring oxygen into the body and to rid the body of waste gases such as carbon dioxide and excess water vapor. This is done by diffusion with the blood. I am wondering ...
5 votes
1 answer
4k views

Why do I breathe out of BOTH nostrils?

After reading the question why do I only breathe out of one nostril I realized that breathing out of both isn't common. I have always breathed out of both, and when I get a stuffy nose, or a runny ...
6 votes
1 answer
890 views

Why is it that I can only detect smells if I breathe, and not when I hold my breath?

At school we're told that the receptors for smell (olfactory receptors) are present in the Schneiderian membrane. But I've noticed that I'm only able to detect smells only while I breathe and not when ...
1 vote
1 answer
327 views

Why does hyperventilation make you feel like you need to breathe more?

Calm Clinic claims: "The problem is that hyperventilation makes your body feel like you're not getting enough oxygen. Essentially, it makes you feel like you need to take deeper breaths and take ...
3 votes
1 answer
594 views

How does a metronome help in controlling breathing rate?

I'm new to the Bio/Medical field so kindly bear with me. I am doing studies on volunteers to formulate algorithms for evaluating Respiration rate from ECG and accelerometer data. I learned about this ...
0 votes
1 answer
104 views

Is there any drawback to breathing deeply all the time? [closed]

Normal, relaxed breathing (eupnea) uses the external intercostal muscles. Diaphragmatic breathing (deep breathing) is more efficient because it balances the ventilation/perfusion ratio across the ...
1 vote
0 answers
74 views

How does the human spine move during healthy deep breathing?

When I googled, I found a lot of questionable sources from various nonscientific sources about human breathing. Is there any science about what the human spine does during healthy deep breathing? ...
2 votes
2 answers
215 views

Exhaled air and lung capacity

I wonder if there is any connection between exhaled air and lung capacity. I need to implement some algorithm in my game to calculate points of how much time you blow and compare it maybe with some ...
0 votes
1 answer
268 views

Does the human abdominal cavity use pressure to maintain posture?

Several of my PT friends have referenced a physical therapist p who has studied breathing named Mary Massery. In her articles, she has referenced the idea of "intra-abdominal pressure" http://www....
2 votes
1 answer
2k views

Why is the partial pressure of oxygen in blood same as that in alveoli

The partial pressure of oxygen in alveoli is about 104 mmHg, after gas exchange it becomes 40mmHg. I understand that during gas exchange, the pressure gradient drives oxygen into the blood and Co2 out....
4 votes
1 answer
986 views

How to maximize lung oxygen intake?

What method of breathing provides a sudden surge of oxygen into the lungs filling it as full as possible in volume and density. Deep breaths? Shallow breaths? Breaths taken while bent over? Deep ...
1 vote
0 answers
51 views

Why doesn't eating affect lung capacity?

The paper Recent consumption of a large meal does not affect measurements of lung function from 2010 claims what it states in the title. However, I don't see why this would be true, as an increased ...
0 votes
0 answers
30 views

What happens if we lose voluntary control of our breathing?

Breathing can be controlled voluntarily, even though it is automatic. What happens if a person loses voluntary control of their breathing? How much would it effect day-to-day life? What are its ...
307 votes
3 answers
287k views

Why do I only breathe out of one nostril?

I was just sitting with my hand next to my nose and I realized that air was only coming out of the right nostril. Why is that? I would think I would use both, it seems much more efficient. Have I ...
0 votes
1 answer
1k views

Why do you get dizzy when exhaling with resistance?

Why do you get dizzy when breathing out while something resists the air outflow and requires more pressure? Like when blowing up balloons or breathing out through a straw. This even happens when ...
1 vote
1 answer
230 views

Entry of particulate pollutants into the nasal cavity

NCERT Chemistry of Grade XII (India) writes Particulate pollutants bigger than 5 microns are likely to lodge into the nasal passage, whereas particles about 10 microns enter the lungs easily. I'm ...
1 vote
1 answer
239 views

How does chest wall compliance affect functional residual capacity (FRC)?

The functional residual capacity is made up of expiratory reserve volume (ERV) plus the residual volume (RV) - i.e. the volume of air remaining in the lungs after passive expiration. Compliance of ...
2 votes
1 answer
306 views

Why does water damage the lungs but amniotic fluid doesn't?

I've read that near-drowning causes lung damage due to water inhalation. How come this is not the case with amniotic fluid? Taking this further, would lukewarm purified oxygenated water cause damage (...
0 votes
1 answer
981 views

How long could Jack Sparrow and Will Turner survive underwater with a row boat over their heads (Pirates of the Caribbean I)? [closed]

How long could Jack Sparrow and Will Turner survive underwater with a row boat over their heads (Pirates of the Caribbean I)? This scene would be physically infeasible due to buoyancy issues (http://...
17 votes
1 answer
2k views

Deliberately choosing one nostril to breathe through

James Nestor, on pp. 41-42 of his book Breath: the New Science of a Lost Art, claims the following. The right nostril is a gas pedal. When you're inhaling primarily through this channel, circulation ...
1 vote
1 answer
51 views

Does the gas in blood remain constant when breathing? Is O2 and CO2 replaced by N?

Am a software dev and working on a non-scientific game that shall include "somewhat realistic" elements of the pulmonary system. Effectively I want to roughly model the exchange of O2 and ...
0 votes
0 answers
166 views

Oxygen dissociation curve and temperature

Say, we have a container with a mixture of gases. The concentration of oxygen is $C_{oxy}$ and its partial pressure is $P_{oxy}$. We then introduce a sample of hemoglobin (deoxygenated) in that ...
3 votes
1 answer
216 views

Can any gas other than nitrogen cause decompression sickness (the bends)?

I know that our bodies use most of the oxygen we breathe in during a dive but, wouldn't our tissues, under pressure, absorb more oxygen than we need? For instance, in normal circumstances, we don't ...
3 votes
1 answer
314 views

Do people need nitrogen from air for health?

Can people breath totally nitrogen-free atmosphere for a long time? I know, nitrogen is essential for life, and in big quantities, but maybe people can take it entirely from food, from proteins, etc?
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1 answer
6k views

Why Lungs can't work in water and gills can't work in air? [closed]

Animals with lungs (such as most terrestrial mammals) cannot breathe if submerged in water, and soon suffocate. Whereas, fish can variously breathe air (at least for few-hours, as some fish frequently ...
1 vote
1 answer
11k views

Breathing becomes harder in certain wind conditions

I'm not sure if this is the right site to ask this, but it seemed like the best option. I've observed on myself that, if I stand on a train platform and a cargo train drives by, creating strong, ...
0 votes
1 answer
62 views

External "lungs" that process your blood the same as your real lungs do - would that stop your need for breathing?

So say your blood goes with a tube out of your body. In an external device all the chemical/biological magic would happen and it would be fed back to your body. Of course this doesn't exist (yet), but ...
-1 votes
1 answer
68 views

Do airsacs contract and expand when birds breathe? [closed]

Something I was wondering. When birds breathe, do their airsacs contract and expand like the lungs do? Also, if they do, do they contract and expand as much as the lungs do? Thanks so much!
-3 votes
1 answer
77 views

How long to breathe (the equivalent of) all of the atmosphere? [closed]

I have done some rough calculations of how long it might take humanity: approx 80,000 years (that's taking Earth's population as 7.5 billion, 11,000 litres a day of breathing, the weight of 1 litre of ...
-3 votes
1 answer
62 views

What is the duration between: the moment we stop breathing and to body's and involuntary mucle movement? [closed]

I studied that if someone stops breathing by pressing their nostrils with fingers and start to starve without oxygen, the body will automatically cause the hands to leave the nostrils in a certain ...
0 votes
1 answer
137 views

What does FETCO2(end-tidal fraction CO2 concentration) represent?

What is end-tidal fractional CO2 concentration? I have searched online and found little actually explaining what this measurement is. Thanks again.
2 votes
0 answers
41 views

How to estimate oxygen consumption of an average human during different activities?

I've tried to find some resource on the internet but had little luck. I'm looking to see if there's any data on average oxygen consumption of average to well trained humans during different activities....
1 vote
1 answer
384 views

Are the IRV and ERV equal in amount?

I am reading about Inspiratory Reserve Volume and Expiratory Reserve Volume in my textbook. So my general question is aren't the two terms show the same amount of air ? I would like to tell you why I ...
6 votes
3 answers
1k views

Are there land animals that use gill-like organs instead of lungs?

Among aquatic, water-breathing animals, gills and other continuous-flow breathing methods dominate over lungs and other storage-based breathing methods as in land animals. Notably, axolotls have gill-...
0 votes
2 answers
121 views

Gastric and intestinal gas exchange

A very long time ago, I happened across research into using an oxygenated liquid in the stomach and or intestinal cavity. I wondered what further results came about of that research, and am having ...
2 votes
0 answers
56 views

Exhalation in human breath, through mouth or nose: which is most usual?

Until now I believed that breath exhalation through the mouth is common for most human beings, and this fact is implicit in several technical contexts of which I can think (sports, music, medical ...
4 votes
1 answer
16k views

Why can't people talk while inhaling?

Why do we have to exhale in order to talk? From looking on Wikipedia, it seems like it has something to do with the glottis, but I'm not clear on the mechanism that makes speech sound so different ...
3 votes
1 answer
676 views

Is breathing a reflex action or is it an intrinsic process?

The process of breathing is controlled by respiratory centers in the brain stem. Do these centers have an innate activity, i.e., just send out signals to breathing muscles intrinsically, and have the ...
-1 votes
1 answer
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How lungs can inhale and exhale? [closed]

I know that lungs are extended and compacted by muscles to create partial vacuum to breath in, or to create elevated pressure to breath out. But one thing seems not right to me... As far as I know, ...