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 are the side-effects of long-term liquid breathing?

I just saw a recent Physics question that mentioned liquid breathing (which I had never heard of before) and I started to wonder about its long-term effects. Let's imagine a person underwent liquid ...
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Why do you die if you cannot breathe?

I was wondering what the actual reason for death by suffocation is. Obviously it is related to oxygen deprivation. But what is the underlying cause of death? Is it due to insufficient oxygen for ...
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How do burrowing animals get enough oxygen?

Tree borers make a small hole in a tree. At the end of it, they chew on wood to elongate the tunnel. They digest food and grow. All this takes oxygen. The entrance to the tunnel is generally small. ...
mmesser314's user avatar
17 votes
8 answers
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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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Does any organism use both photosynthesis and respiration?

Chlorophyll and hemoglobin are very similar molecules, as far as I understand. The important difference being one using an iron atom and the other a magnesium atom. Do any organisms use both to get ...
LocalFluff's user avatar
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How can we differentiate between respiration and breathing?

I am a student of 10th grade, and I eagerly want to learn biology. What is the difference between respiration and breathing?
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Why does a worm's skin need to be wet for oxygen to diffuse across it?

Pages I've read about worms' respiratory systems says that the skin needs to be wet (covered in mucus) or oxygen won't diffuse across the skin. Why? If there is more oxygen outside the worm's skin ...
Mark Eichenlaub's user avatar
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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 ...
Chahak's user avatar
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During starvation, does the human body do anything to prioritize which organs receive nutrients?

When food is scarce, the body slows its metabolic rate to conserve energy. Are there any other systems or processes that prioritize which organs receive nutrients?
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How does the body switch between aerobic and anaerobic respiration?

Lets take the case of a person doing heavy exercise. Aerobic respiration is taking place, but oxygen is about to be finished up. Glycolysis occurs, Krebs cycle finishes. Now NADH and FADH2 enter ...
another 'Homo sapien''s user avatar
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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?
SomeUser's user avatar
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How long can a bee surive in a jar?

So, some people and I encountered an adventure game where you have a bee in a jar and need to move it from place to place before it suffocates, and someone tried to find out how long a bee would ...
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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 ...
uhoh's user avatar
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What's the (or some of the) minimum(s) amount of atmospheric carbon dioxide needed by plants?

We currently have a problem of increasing $\ce{CO2}$ in the atmosphere. But assuming we find a way to carbon sink it, what is the minimum $\ce{CO2}$ we need to leave in the atmosphere to provide a ...
user3082's user avatar
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How do plants get their O₂ for respiration during the night?

If I am not mistaken the stomata are closed during the night. As a result I have a hard time to imagine how the plant can get the O2 it needs for respiration during the night. I thought the plant ...
Velma Dinkley's user avatar
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Why do earthworms surface after a rain?

Googling, I find two different explanations for why earthworms tend to surface after a rain. This page from UCSB, for example, gives both answers, contradicting itself: The first explanation is ...
Mark Eichenlaub's user avatar
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How much gas is exchanged in one human breath?

When we breathe, our lungs absorb a portion of the oxygen in the air, and replace it with some amount of carbon dioxide and water vapor. Typically, how much $O_2$ (in grams, milliliters, or moles for ...
Nathan Reed's user avatar
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How much oxygen does a plant use up at night?

Given the fact that plants cannot do photosynthesis at night but need respiration for their energy needs, they use up oxygen and generate carbon dioxide. But how much is this? If I fill a room with ...
gexicide's user avatar
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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, ...
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Why is ATP synthase sometimes referred to as ATPase?

Quite a few times I have seen the term ‘ATPase’ used for what I would consider ATP synthase. For example, my text has: “The phosphorylation of ADP to ATP is also catalysed by the enzyme ATPase.” I ...
Jaca's user avatar
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About acetyl-coA in the Krebs Cycle of respiration

In respiration, Krebs cycle starts with acetyl coenzyme A which is made from pyruvate. However, it is said that the cycle keeps repeat it self with oxaloacetate turning back to citrate and cycle ...
bean's user avatar
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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-...
Tal's user avatar
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A doctor might give bicarbonate (HCO₃¯) to a patient who is breathing very rapidly. What is the doctor assuming about the patient’s blood chemistry?

The answer is: The doctor is assuming that the rapid breathing is the body’s response to low blood pH. (Source: Campbell Biology) But this answer doesn't make sense. Why would the doctor give the ...
Ordinary Owl's user avatar
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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.
katzenklavier's user avatar
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Is oxidative phosphorylation less efficient in gram positive bacteria?

Gram negative bacteria perform oxidative phosphorylation in their periplasmic regions, between the inner and outer membrane where a proton gradient is maintained and used by the ATP synthase to make ...
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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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Cooperativity of haemoglobin and oxygen dissociation curve of haemoglobin

Haemoglobin shows positive cooperativity with oxygen. When an oxygen atom binds to one of hemoglobin's four binding sites, the affinity to oxygen of the three remaining available binding sites ...
Sriharsha's user avatar
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1 answer
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How could cyanobacteria survive the anaerobic conditions of ancient earth?

I was reading about cyanobacteria and came to know that they are the first organisms that filled the atmosphere with oxygen around 2.3 billion years ago but then I realized that they themselves are ...
Anindya's user avatar
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What is a lethal dose of THC?

With the oil form of THC being stronger then ever. What would happen if one was to take a stomach full of THC oil?
Muze's user avatar
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Oxygen uptake with gills from water vs lungs from atmosphere

The concentration of oxygen in water tends to be around 6.5-8 mg/L. In the atmosphere, it is 21%, one liter of air weighs roughly 1.25 gram, so, oxygen concentration is 0.25 g/L or 250 mg/L. So, lungs ...
Winstan's user avatar
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Where do all the NAD+s come from?

In the mitochondrial respiration (of plant cells) NADH is reduced from Nad+ as part of the TCA (converting malate to oxaleoacetate). But where do the NAD+s come from? The TCA cycle is working even ...
Hannah's user avatar
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1 answer
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How is AMP "recharged" to become ATP in a cell?

I understand that after the translation stage of ribosomal protein synthesis, tRNA molecules are floating in the cytoplasm without attached amino acids until they find the correct aminoacyl tRNA ...
Jean Valjean's user avatar
5 votes
3 answers
794 views

Do dogs have something different about their physiology that allows them to pant without hyperventilating?

I was wondering this as I considered how effective panting would be for humans as a means of cooling.
Chris Cooper's user avatar
5 votes
1 answer
216 views

Do fat people have more chances of developing nitrogen bends?

I was reading some text on deep sea physiology. I got to know that solubility of nitrogen in fat is five times that in water. The exact text from the book animal physiology adaptation and environment ...
Anonymous's user avatar
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2 answers
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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, ...
Stan Shunpike's user avatar
5 votes
2 answers
111 views

How does gas equilibration occur in the alveolus, numerically?

I am attempting to model gas exchange across the alveolar membrane. My main question is there a direct exchange of O2 molecules for CO2 molecules? If so, then my model predicts (assuming alveolar ...
ArkoFlake15's user avatar
4 votes
2 answers
198 views

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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3 answers
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Why do bacteria eat enamel?

What causes tooth decay bacteria or acids? I've been told that it is a combination of both but why would bacteria eat enamel? There are much easier supplies of protein for bacteria to munch through (...
Charlie's user avatar
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4 votes
1 answer
228 views

Will obligate aerobic bacteria die if placed in a buffer solution even in the presence of oxygen?

The electron transport chain in aerobic bacteria functions by pumping H+ out of the cell to establish a concentration gradient. So if the bacteria are placed in a buffer solution having pH equal to ...
trinitrotoluene's user avatar
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1 answer
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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 ...
Poin's user avatar
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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 ...
Ataa Altaf's user avatar
4 votes
2 answers
593 views

Are there bacteria that respire anaerobically in aerobic conditions?

There are facultative anaerobic bacteria that switch to anaerobic respiration in an anaerobic state, but are there any organisms that would still perform anaerobic respiration even when shifted to ...
Polisetty's user avatar
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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", ...
octern's user avatar
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Glycolysis - ATP production

In glycolysis, 2 ATP molecules are produced from each triose phosphate molecule (to give a total of 4 ATP produced; 2 net produced as 2 were initially used up in the reaction). I don't understand how ...
A.P's user avatar
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0 answers
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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?
Arrrstin's user avatar
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0 answers
43 views

Non-cumbersome respiration sensor for sleep study?

I'm working on a project where I collect ECG signal from multiple volunteers, derive ECG derived respiration(EDR) from the timestamped ECG signal and calculate the cross correlation between EDR and ...
Naveen's user avatar
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5 answers
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Why *morning walk*?

My PT teachers professes working-out/training in early morning hours is the best time to do so. A quick search on benefits of morning walk (or similar phrases) reveals a lot of information which seem ...
RinkyPinku's user avatar
4 votes
1 answer
575 views

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-...
Rachel W's user avatar
3 votes
2 answers
1k 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 ...
Bibliophile's user avatar
3 votes
3 answers
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Does the necessary Carbon Dioxide need to be in the atmosphere for mammals?

In the answers to this question, we've learnt that carbon dioxide is necessary for mammalian life, but is it necessary in the atmosphere/to breathe it in? Or does the act of respiration give a ...
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