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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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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4answers
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Is there any organism that is born with all the nutrients and resources needed for their entire lifetime?
I understand that adult mayflies have no mouth, but they do take in oxygen through openings in their exoskeleton.
Is there any organism that does not need to ingest any type of nutrition and does not ...
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1answer
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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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2answers
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Why does affinity of Hemoglobin increases for Oxygen in carbon monoxide poisoning?
I have studied this in almost every physiology book but I just can't understand how carbon monoxide can affect oxygen's affinity to Hemoglobin. I know that there is left shift in oxygen dissociation ...
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How does shortage of oxygen halt the NADH dehydrogenase complex?
I understand that in the absence of oxygen the functioning of cytochrome c oxidase stops because it is its substrate. However I don’t understand how stopping cytochrome c oxidase also stops the ...
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1answer
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What triggers the switch between aerobic and anaerobic respiration?
I understand that when there is a shortage of oxygen cells convert the pyruvic acid from glycolysis to lactic acid to regenerate NAD+. What I don’t understand is how they switch to anaerobic ...
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1answer
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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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1answer
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How are electrons entering the electron transport chain in cellular respiration energised (excited)?
In photosynthesis, electrons are excited by light energy from the sun (photoactivated).
How do they become excited in human cellular respiration?
I believe it has something to do with NADH and ...
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Calculation of Respiration Fluxes in Terrestrial Ecosystems Based on Total Respiration (RT)
Overview
Researchers have been studying a temperate grassland ecosystem with the view to understand it's current status with regard to carbon inputs and outputs and to identify whether the grassland ...
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1answer
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What does the difference between GPP - NPP represent?
Overview
Researchers have been studying a temperate grassland ecosystem with the view to understand it's current status with regard to carbon inputs and outputs and to identify whether the grassland ...
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2answers
142 views
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 ...
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If the effect of increase CO2 in the air has a negative effect, why doesn't decreased CO2 have a positive effect?
I recently asked a question about whether there were studies on the effects of reduced CO2 level air and got what sounds like a good answer:
Are there studies on the effect of reduced CO2 levels on ...
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1answer
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Why does carbon dioxide diffuse easier through the bilipid layer than oxygen?
When gas exchange occurs during respiration, the pressure of oxygen in alveoli is around 105 mmHg, whereas in the blood vessels in close contact with alveoli is 40 mmHg. For carbon dioxide the values ...
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1answer
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Surviving only on another's exhales?
While reading this - Surviving under water in air bubble - this question came to me:
How long can an adult person survive on breathing in only exhales of another adult person? Can this be even ...
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Why is the V/Q Ratio 0.8 not 1?
According to: https://en.wikipedia.org/wiki/Ventilation/perfusion_ratio the ideal V/Q Ratio would be 1.0 because 1 L of blood can hold about 200 mL of oxygen and 1L of humidified air has about 200 mL ...
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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 ...
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1answer
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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 ...
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1answer
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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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1answer
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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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In electron transport system the final acceptor of proton is?
My lecture notes say that the answer to this is inorganic phosphate (iP)..and the question is about proton not electron so the answer can't be oxygen. But I don't understand how is the answer iP
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1answer
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Are the bacteria doing the same photosynthesis as plants do?
I mean Plants during photosynthesis produce oxygen but Do bacteria also produce oxygen during photosynthesis or produce other gases?
If yes , how do these bacteria process photosynthesis by ...
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1answer
54 views
Is there any evidence of causation for breathing rate to affect blood pressure in a human?
I did some research and trials, and with 5 trials for a normal heart rate and 5 done 45 seconds into breath holding, the results came back showing that my heart rate of 116/65 mmHg increased to 138/90 ...
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2answers
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What does this graph explain?
I find this graph incredibly confusing. Is it saying that when there is a decreased affinity (of hemoglobin to oxygen, I think?), the partial pressure of oxygen increases with the same percent ...
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1answer
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Light Hyperoxia
Imagine you're in some lowland way below sea level were the oxygen partial pressure is higher than at sea level but still lower than the 0.5atm limit. Would their be any effect that isn't deadly or ...
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2answers
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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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1answer
266 views
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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What is the benefit of oxygen tanks to persons trappped in an enclosed space?
When people are enclosed in an air-tight space, the levels of carbon dioxide will rise to lethal levels (hypercapnia) long before the oxygen is exhausted (hypoxia). For example, the astronauts of ...
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Anaerobic Respiration vs Aerobic Respiration during physical activity
So I was wondering about the difference between aerobic and anaerobic respiration on the context of burning calories. While swimming we can choose to keep our head up and breathe, or keep our head ...
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1answer
1k views
Is the rate of photosynthesis higher than the rate of respiration?
In photosynthesis carbon dioxide is used up and oxygen is produced and at the same time plants respire too. So oxygen is used up and carbon dioxide is produced.
Then the net exchange of gases should ...
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1answer
71 views
How is it possible to breathe perflurocarbon?
I have heard of liquid breathing, where an organism, usually a person, would be breathing in perflurocarbon. Now I looked up perflourocarbon on wikipedia and I noticed, no oxygen at all, but fluorine ...
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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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1answer
69 views
What's the minimum, if any, concentration of atmospheric nitrogen needed by plants?
What's the minimum, if any, concentration of atmospheric nitrogen needed by plants? Would plants be able to grow in an atmosphere with just carbon dioxide and oxygen?
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Oxygen balence from growing plants for food
I had thought photosynthesis and respiration where pretty much Oxygen and Carbon neutral per calorie.
http://news.mit.edu/2014/technical-feasibility-mars-one-1014
If, as the project plans, crops ...
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How much pressure can human withstand if inner and outer pressure is balanced?
I know human can't dive too deep because there's pressure difference between inside and outside of the body. But how much pressure can human withstand if human is breathing components that is ...
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ATP generation during respiration [closed]
How many ATP molecules are generated from oxidation of FADH2 formed during complete oxidation of 10 molecules of maltose?
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My method-
As maltose is a disaccharide ( made up of two ...
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1answer
267 views
Why do zoologists classify sponges as animals rather than plants?
Sponges are fixed, do not move settle at one place, do not have a reproductive apparatus, respiratory apparatus, or organs, and live in marine environments. Why then zoologists consider that sponges ...
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1answer
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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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1answer
134 views
Viability of argon-oxygen atmosphere
Can humans breathe an Argon-Oxygen atmosphere, where Argon substitutes the inert Nitrogen gas which currently populates our atmosphere? I didn't quite know which forum to stick this one in; I put it ...
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2answers
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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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1answer
317 views
Could humans breathe if the average methane content of the atmosphere increased to 1%?
Below is a table of atmospheric composition. Could humans breathe if the average methane content of the atmosphere increased to 1%?
Table 7a-1: Current Average composition of the atmosphere up to ...
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2answers
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Does exhalation help us speak, and if so, how?
Everyone knows that we breathe in oxygen and breathe out carbon dioxide. That's how the respiratory system works. But we also use the respiratory system to produce sound and language. When we speak or ...
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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 ...
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0answers
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Aerobic respiration [closed]
I read a sentence in my biology book while i was reading respiration chapter. i wasnot able to understand it. It was in the process of oxidative phosphorylation"
"as the proton pass through channel ...
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3answers
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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 ...
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1answer
683 views
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 ...
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2answers
707 views
Role of ATP and AMP in functioning of Phosphofructokinase
I know that when ATP is more then it inhibits PFK and hence regulate the number of ATP. But how does PFK reactivates itself? Is it due to removal of ATP from allosteric site that just reconfigures the ...
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1answer
51 views
Oxygen mask to patients
Why are oxygen masks given to patients? Can't they take in the atmospheric oxygen? Also, why do they die if the oxygen mask stops providing oxygen?
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2answers
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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 ...
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1answer
649 views
Effect of forced breathing on RBC size
Microcytosis, i.e. decrease in the size of RBCs occurs:
– In iron deficiency anaemia,
– During prolonged forced breathing and
– When osmotic pressure of the blood is increased.
I am ...
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3answers
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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 (...
