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Questions tagged [respiration]

The exchange of gases across organs that facilitate transport of the gases to and from the cells of the organism.

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What is the contribution of respiratory rate to oxygen absorption?

Firstly, I am aware that oxygen absorption in the alveolus is perfusion limited. Apparently, oxygen equilibrates in ~0.25 seconds or 1/3rd of the way along a pulmonary capillary. However, we are ...
2 votes
2 answers
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Does decompression sickness (the bends) ultimately come from the change in pressure in the lungs, or the actual total ambient pressure over the body?

I am not well versed in physiology, and I've found the literature available to me confusing on this point. Mostly I'm going off of wikipedia, mind you. The article on Decompression Sickness' Mechanism ...
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How is CO2 and O2 separated in our body during gas exchange?

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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Partial pressure of gases in the alveoli

The atmosphere has a partial pressure of oxygen of 160mm Hg, but in the alveoli it is 105mm Hg. The partial pressure of carbon dioxide in the atmosphere is 0.3mm Hg, but 40mm Hg in the alveoli. How ...
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How does carbon dioxide diffuse into 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 ...
2 votes
1 answer
947 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 ...
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1 answer
213 views

Could fish safely "breathe" pure oxygen in their water?

I've heard it said various times before that humans can't breathe pure oxygen, or at least not for very long, before it would kill us. But during a discussion on Worldbuilding, the difference between ...
1 vote
1 answer
456 views

Can fermentation and aerobic respiration occur at the same time?

In muscle cells during exercise, does lactic acid fermentation and aeorobic respiration occur at the same time, and does this mean the cell makes more or less ATP during this time? The cell can't ...
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Insect decline and CO2 concentration

In the UK, where I live, for several years we have had cold dry springs which seems to delay appearance of insects. So irratic weather could cause species to emerge out of sync with their food species ...
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1 answer
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Aerobic respiration takes place in the mitochondria; anaerobic respiration takes place in the cytoplasm. Is there a biochemical reason for this?

According to hyperphysics.edu, and my general knowledge, anaerobic respiration occurs in the cytoplasm. ("Anaerobic respiration (both glycolysis and fermentation) takes place in the fluid portion ...
5 votes
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934 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, ...
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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 ...
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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 ...
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294 views

Gas exchange in the alveolus

When our teacher was talking about the gas exchange inside the alveoli, he mentioned the flow of air and the flow of blood was going in opposite directions so that there always would be a ...
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Besides carbon dioxide and water vapor, what waste gases are removed through the human respiratory system?

Canadian Lung Association remove the carbon dioxide and other waste gases that your body's doesn't need. LibreTexts: water vapor, carbon dioxide, and other waste gases move from inside the body ...
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Cellular respiration and membrane surface protons

The final product of cellular respiration is the proton motive force, formed by protons pumped out of the membrane and by the voltage due to all charges. While Mitchell’s original theory considered ...
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How deep underwater could you breathe using a tube which breaks the surface until the water pressure makes it impossible to inhale air?

I'm struggling with a question asking how deep you can breathe underwater using a hollow reed before the water pressure makes it impossible to inhale. The question asked to use this data of maximal ...
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Highest Pressure Human Body Can Survive In?

One design for underwater human inhabited environments is to have equal pressure between the surrounding water and the submerged habitat, thus allowing a section of the floor to be open to the water ...
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Why don't we breathe nitrogen when it makes up most of the air?

Why don't we breathe nitrogen while it makes most of the air? Why do we always tend to breathe oxygen, not hydrogen and nitrogen?
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Mammal size and capillary wall thickness

How does capillary wall thickness vary with the size of the animal? Background/context of question: Of the following, Figure 1 is most consistent with the fact that, in general, smaller mammals have:...
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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....
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Is the net gain of ATP during glycolysis 2 or 8?

As I understand, 2 ATP are consumed during steps 1 and 3 (glucose -> glucose-6-phosphate and fructose-6-phosphate -> fructose-1,6-bisphosphate) and then 4 ATP are produced during steps 6 and 9 (...
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268 views

Does Usnea (Old Mans Beard) have negative effects on the respiratory system?

Being a fungus does it have negative effects similar to that of mold, especially on the respiratory system?
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How do ants get oxygen in deep colonies?

With ant colonies getting to be +7 feet deep, how does oxygen renew that deep for their respiration demand?
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Haldane effect plays more important role in promoting carbon dioxide transport than that of the Bohr's effect in promoting oxygen transport why?

This is the actual question And the correct option is "A" But I can't figure out why Haldane effect plays more important role in promoting carbon dioxide transport than that of the Bohr's ...
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Is death by cyanide the same as suffocation?

Reading this description of cyanide poisoning — http://indianapublicmedia.org/amomentofscience/how-cyanide-kills/ — makes me wonder if death by cyanide is equivalent to suffocation. Is it?
4 votes
1 answer
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What is the mechanism behind ventilatory acclimatization?

In my respiratory physiology lectures, my professor explained that hypoxia-induced hyperventilation occurs in 2 stages when people try to acclimate at high altitudes. My question is about the long-...
3 votes
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Are there any organisms that do not respire?

I am not talking about not needing oxygen. I understand that there are organisms that do not need oxygen. I am asking if there are any organisms that do not respire. (Eg, only ferment) I would like to ...
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How does Anabantoideis' labyrinth function? What does it look like?

Anabantoideis are fish with an organ that allows them to take oxygen directly from the air outside of water. However, I cannot find much on how this functions, nor can I find any clear image of what ...
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1 answer
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Is bacterial respiration a continuous process?

Respiration in micro-organisms is the process of releasing energy from food. There are two ways of doing so: Aerobic respiration occurs in the presence of oxygen and produces ATP from the complete ...
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How is it possible to breathe perfluorocarbon?

I have heard of liquid breathing, where an organism, usually a person, would be breathing in perfluorocarbon. Now I looked up perfluorocarbon on Wikipedia and I noticed, no oxygen at all, but fluorine ...
15 votes
2 answers
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Do photosynthesis and respiration violate the law of conservation of energy?

I don't know, if it's a physics question, biology or chemistry question but anyways here it is: I have been taught that to produce one molecule of glucose in photosynthesis, 18 ATP molecules are used ...
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If during exercise the affinity of oxygen for haemoglobin is decreased, what are the general consequences for tissues?

During exercise more respiration occurs, and hence more oxygen is required. So the oxygen dissocation curve is shifted to the right. So at a given Oxygen partial pressure, the haemoglobin is less ...
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Why does fresh zinc oxide cause chills but "old oxide" does not?

Inhalation of fresh zinc oxide causes chills; aka- zinc chills, brass founders ague, oxide shakes, etc. But if the oxide is a few hours old it will not cause chills. I had them once long ago, an old ...
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1 answer
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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 ...
8 votes
1 answer
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Does an old growth forest ecosystem produce more oxygen than it consumes?

I would like to consider an old growth forest ecosystem such as a large part of the Amazonian forest. It is common to refer to such beautiful forests as a source of oxygen for the world. For example, ...
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 (...
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1 answer
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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://...
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Where does nitrogen go or come from as its partial pressure in different parts of the lungs decreases or increases?

Here's a table from Guyton and Hall Textbook of Medical Physiology showing the partial pressures of gases in different types of air: We can see that as the partial pressures of some gases decrease or ...
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Does COVID interfere with internal respiration?

Siddiqi et al. wrote in January 2021, Pulmonary ECs [= endothelial cells, in this paper] have an important role in immune surveillance, maintaining alveolar integrity and ensuring appropriate oxygen ...
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What is static compliance?

If static compliance is change in volume with respect to change in transpulmonary pressure, when there is no gas flow. My question is; if there is no gas flow, how would volume Change?
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What does equilibrium curve signify?

While learning about gas exchange, I came across the haldane effect. Then i came across the CO2 -dissociation curve. Apparently the curves are "equilibrium curves". Does it mean that the ...
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If stomata is closed at night ,how does exchange of oxygen take place at night? [closed]

In this article in the second paragraph, it is written that the stomata remains closed at night to reduce water loss. We know that the plants respire and take in oxygen at night. Then how do plants ...
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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 ...
2 votes
1 answer
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Why does inert gas asphyxiation trigger unconsciousness almost immediately?

According to an official safety bulletin from the U.S. Chemical Safety and Hazard Investigation Board: "Breathing an oxygen deficient atmosphere can have serious and immediate effects, including ...
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1 answer
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In lichen, do the fungi consume the oxygen produced by algae?

Is the oxygen produced by algae in photosynthesis consumed by the fungi, specifically in marine lichens where oxygen is less abundant? I am wondering this because of a speculative evolution project.
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Is it true that oxygen levels in water limits fish size?

This answer says that breathing water is inefficient, and that may act as a limiter to the size of fish. I've heard this in a couple of other places as well, but cannot recall the sources. However, ...
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What is the relationship between the oxygen affinity of hemoglobin and the maximal oxygen uptake (VO₂ max) of the human body?

I was curious about whether any of the numerous documented human hemoglobin variants conferred a quantifiable athletic advantage but the only thing I've found of any relevance is the relative oxygen ...
1 vote
1 answer
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Is there a term for the entire system of moving oxygen around?

The respiratory system brings oxygen to the blood, and also can include stuff like nicotine from smoking. The circulatory system brings oxygenated blood (and all its little friends) to wherever they'...
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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 breathe if submerged in water, and soon suffocate. Whereas, fish can variously breathe air (at least for few-hours, as some fish frequently ...