Questions tagged [breathing]

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

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1k views

Deliberately choosing one nostril to breath 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 ...
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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 ...
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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 ...
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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 ...
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How can alveolar gas contain water vapor and less oxygen if the breathing loop is isobaric?

I was wondering why the partial pressure of oxygen is lower in the alveoli than in the air we inspire. From this related question I found the answer that the water inside the lung saturates the air ...
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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, ...
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1answer
39 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 ...
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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-...
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107 views

Can all animals breathe manually?

Originally I was pondering about why we have the ability to breathe manually. I couldn't think of any tangible advantage, given that the body can develop mechanisms to regulate the rate of breathing ...
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Lungs permeability

My question is: $O_2$ and $CO_2$ pass to (in & out) the bloodstream due to difference in partial pressure and its permeability to those gases (I suppose that's why no $N_2$ passes). So, to what ...
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108 views

What is a deep exhalation/inhalation?

I tried to find the academic definition of deep exhalation/inhalation but found nothing special. I speculate that the correct definition is as follows: • Deep ...
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Formula for Oxygen Consumption for Atlantic Salmon (Mathematical) - insecurities regarding variable

The oxygen is calculated in mg per kg per something, so what does $h^{-1}$ stand for? hours maybe? The formula given below is an estimation of oxygen consumption for Atlantic salmon \begin{...
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How much oxygen does a human need to breathe?

So, I know that the title isn't very precise, but so is my current knowledge of the subject. It begs the question of what unit are we talking or maybe percentage? Let me explain the situation. Earth'...
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239 views

How is breathing involuntary if the muscles that control it are skeletal?

How is breathing involuntary if the muscles that control it are skeletal? Breathing is involuntary. However, the muscles that control it are skeletal: intercostal muscles and the diaphragm. Are there ...
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What are the sources of molecular hydrogen in human breath?

In the BBC News article CES 2019: Tech preview of the expo's hottest new gadgets there is a new product that one can use to measure the hydrogen in ones breath, and this is supposed to have some ...
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45 views

What's the relationship between oxygen consumption and ambient oxygen concentration for a lobster?

I was looking at a research paper by Thomas (1954) and came across a graph with ambient oxygen concentration plotted against oxygen consumption rate of a European lobster kept in water. As we can see,...
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How does fish breath under water? [closed]

How we will describe the whole mechanism of fish breathing under water? How they absorb oxygen and and then remove oxygen through a process known as gas exchange?
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How is CO2 and O2 separated in our body during breathing?

https://www.msdmanuals.com/home/lung-and-airway-disorders/biology-of-the-lungs-and-airways/exchanging-oxygen-and-carbon-dioxide The image in the above link shows that CO2 and O2 both pass through the ...
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How does CO2 gets diffused into the red blood cells?

Carbon dioxide diffuses out of the tissues and into the blood, where it is dissolved in the plasma. While some of the carbon dioxide remains dissolved in the plasma, most carbon dioxide diffuses into ...
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332 views

Why doesn't it feel suffocating when taking a shower? [closed]

When one walks into a bathroom where someone is (or just finished) taking a shower it is hard to breathe, because it's filled with steam, yet the person taking a shower can breathe just fine despite ...
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How long could a shark breathe pepsi?

Sharks breathe seawater. Seawater isn't 100% pure water, but mostly water. Pepsi (other colas are available) isn't 100% pure water, but mostly water. How long would a shark be able to breathe if ...
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119 views

Is too much CO2 in the air toxic?

I know that if there is too much CO2 in the air we will have too much greenhouse effect. I would like to know if there is too much CO2 in the room, something like 3% while there is also more that ...
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Why can't we kill ourselves by holding our breath?

Is it possible to kill yourself by holding your breath? This question is obviously copied from Quora, but I had heard it as a fact that we cannot kill ourselves by holding our breath and I'm looking ...
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How can diving with 100% oxygen not destroy your lungs? [closed]

It is possible this should be moved to physics, depending on the nature of the answer (i.e. if the reason is physical). But I suspect the explanation is biological, so I posted it here. Sometimes ...
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Why does menthol clear a stuffy nose?

I've looked all around online for an answer to this. Some sites say menthol causes blood vessels in the nose to constrict, some sites say it causes blood vessels to expand. Many sites simply say it's ...
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Are nosebleeds unique to humans?

Are there other species that get nosebleeds? If so, do they occur for the same reasons that humans get nosebleeds? How would an animal stop a nosebleed?
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Why does the pulmonary artery have higher glucose concentration than the pulmonary vein?

If the pulmonary artery have higher glucose concentration than the pulmonary vein, does it mean glucose will be consumed during gas exchange? That confused me because gas exchange is something like ...
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332 views

Breathing with Clogged Nose during Sleep

This just happened to me recently, I was trying to sleep with clogged nose, so I tried breathing through my mouth. As you can imagine it was hard, but I managed to sleep deeply. So I became curious, ...
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1answer
214 views

Why are nosebleeds easier to get in the winter?

I understand it probably has to do with the dry air, but what does dry air do to make nosebleeds so easy to get? For example, even gently blowing your nose can cause a nosebleed for some people during ...
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512 views

Why does breathing increase in higher temperatures?

In my experiment, my group increased the temperature of a fish's water. We noticed the fish took more breaths than the prior normal temperature. Is this because the fish is trying to breathe in the ...
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Why does the upper respiratory tract not fill with water when diving?

When we swim, I know we close the some of the vestibular folds in the larynx part of the throat to hold our breath (and to avoid water from getting into the lower respiratory tract, I suppose). I ...
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Affinity for oxygen and carbon dioxide in animals

I'm currently reading Treatise on Invertebrate Paleontology (A) and don't understand the following fragment: The affinity for oxygen in lower animals is many times that in higher ones, whereas ...
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How is the human oxygen absorption dependent on the concentration of oxygen in respiratory air?

I just wanted to calculate the theoretical time span in which I could survive (conscious) in my apartment without letting the air on the inside exchange oxygen/carbon dioxide with fresh air. During my ...
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Is death by cyanide the same as suffocation?

I started the night off by reading about "what does drinking the Kool-aid mean" this lead to a wikipedia article which described the horrors of the Jonestown cult mass suicide/murder in the 1970s. ...
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3answers
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Breathing faster to lose (more) weight?

I understand that when the human body loses weight, the vast majority of that weight is lost as $CO_2$ (and a small bit is lost as water). I expect the predominant way $CO_2$ exits the body is through ...
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389 views

How do fishes “breathe” while eating?

First of all, a fish opens its mouth and water enters which passes through its gills. This helps in oxygenating its blood. So, if any food particle is in its mouth, how can it "breathe" i.e. how does ...
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1answer
116 views

Nose breathing and swimming

If you're standing and holding your nose closed, it becomes quickly uncomfortable; although you can breath fully through your mouth, it still feels like your lacking air since you're naturally trying ...
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More *total* oxygen absorbed by breathing fast or slow?

I have heard that human lungs capture/absorb/process more oxygen by breathing slower. A) Is the above true? B) If so, if my primary concern was absorbing the most total oxygen (not most efficient), ...
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Oxygen dissociation curve and temperature

So, we have a container with a mixture of gases. The concentration of oxygen is $C_{oxy}$ and its partial pressure is $P_{oxy}$. Then we introduce a sample of hemoglobin(deoxygenated) in that ...
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112 views

Staying underwater: would mutual rebreathing help?

If two people want to stay underwater for as long as possible, could they last longer if they exchange breaths in turns (ie: through a simple tube or mouth-to-mouth) than if they simply hold their ...
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1answer
348 views

Does the Valsalva maneuver require a completely closed airway? How do the effects compare to exhalation against partial resistance?

The Valsalva maneuver is defined as "attempted exhalation against a closed airway", "The effort to breathe out forcibly while the mouth and nose are firmly closed or the vocal cords pressed together", ...
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Will I hyperventilate if I breath twice as fast at an altitude with half as much oxygen as I am used to?

Will I hyperventilate if I breath twice as fast at an altitude with half as much oxygen as I am used to? If not twice as fast, should I breath any amount faster on average than usual when at high ...
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Sitting in a closed room filled with regular air - for how long will the air last?

The question has implicitely a lot of variables attached to it: volume of the room activity how closed the room is size of the person (I'm 168cm long and 64 kg heavy) That could probably be turned ...
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1answer
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Cough at 1000 km/h?

How fast does air move in the airways during a cough? The following passage is from Talley and O'Connor's Clinical examination: a systematic guide to physical diagnosis (emphasis mine): Cough is a ...
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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 ...
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1answer
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Why Lungs can't work in water and gills can't work in air? [closed]

Animals-with-lungs (such as most terrestrial mammals) cannot continue breathing if merged in water, and soon die. Whereas fishes can breathe in water (at least for few-hours in case of some fishes ...
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1answer
67 views

Would short term increases in oxygen lead to beneficial effects?

After some thinking, I am wondering if having a 30% atmospheric oxygen concentration (or some other concentration) for a short time would increase the regeneration of energy in a body? It seems like ...
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1answer
637 views

Why did we evolve to control our breath?

I had this question in my mind and tried to think of why we would evolve to be able to control our breath. I remembered the Aquatic Ape Hypothesis, which makes a lot of sense and would explain it, ...
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Abdominal muscles during inspiration/inhalation

During inspiration I am aware that the diaphragm and the external intercostal muscles contract, thus increasing the volume of the thoracic cavity. However, I read on my textbook that during ...
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What is the path taken by an oxygen molecule as it passes into the lungs to a muscle cell in the body? [closed]

My teacher tried to describe this question to me, but I just don't get it.