Talk:Gas exchange

Educational assignment
Hello, I am a final year biology student currently taking part in a science communication course. As part of the course, I will be editing the Gas Exchange wiki.

The educational assignment is now complete, but I will continue to edit over the coming weeks.

Untitled
Hi i'm a third year Biology undergraduate planning on editing this page as part of a science communication module on my course. Any suggestions would be really helpful thanks.

2001:630:12:1020:E8A4:57CA:7D47:7DAA (talk) 14:38, 19 March 2013 (UTC)

2012-01-13 edits by MarXidad
I removed some dangling stuff without actually cleaning up the rest, which may have still left the article in a weird state but less obvious that it needs help and I apologize for this. MarXidad (talk) 16:48, 13 January 2012 (UTC)

...
e from "ventilation". Should this page discuss ventilation systems or should it have its own article? (Granted, complete information on ventilation systems would warrant a full article, but it might be a while before we get enough.)

--Furrykef 16:27, 19 May 2004 (UTC)

How about stuff on the actual chemical changes in gas exhange in red blood cells?

Convection?
The article references convection as being responsible for much of the movement of gases in/out of lungs. Erm, I don't think that's right (just look at the article on convection to see what I mean), but can't think of what's meant instead. Any ideas anyone? --Plumbago 13:19, 30 September 2005 (UTC)

@Plumbago I think you are correct. The movement of gases into and out of the lungs can be explained using Boyle's Law. The diaphragm contracts, increases volume, decreases pressure, and air moves from high (atmospheric) pressure and low (intrapulmonary) pressure. --Ebarbye (talk) 01:01, 15 June 2010 (UTC)

I think the correct term for the exchange of gases between the alveoli and the blood is diffusion (as is mentioned in the article) the movement of oxygen from the local area of the lungs to all the cells throughout the rest of the body is still diffusion. It is diffusion down a concentration gradient rather than convection down a heat gradient. —Preceding unsigned comment added by 118.209.11.249 (talk) 12:29, 1 September 2010 (UTC)

While oxygen does diffuse from the alveoli to the capillaries, it does not diffuse from the lungs to the rest of the body. That process is known as perfusion, driven by the pumping action of the heart. We would all be dead if we had to wait for oxygen to simply diffuse from the lungs to the brain or elsewhere. Look at the Human Physiology/The respiratory system Wikibook to get much better information than what is in this article. I feel bad for any student that relies on this article for their information as it stands now; I will be sure to warn mine about it. — Preceding unsigned comment added by Catha2008 (talk • contribs) 00:35, 18 August 2011 (UTC)

some refs
$ eutilsnew -v -out xxxx '"gas exchange" diffusion anhydrase' Count is 12 versus 12 first3=WJ | last4= | first4=  | title=Towards improved artificial lungs through biocatalysis. | journal=Biomaterials | volume=28 | issue=20 | pages=3131-9  | date=Jul-2007 | year=2007  | url=http://www.ncbi.nlm.nih.gov/pubmed/17433433  | pmid=17433433  | doi=10.1016/j.biomaterials.2007.03.021  | pmc=10.1016/j.biomaterials.2007.03.021 }}

stomata
$ eutilsnew -v -xml -out xxxx '"gas exchange" stomata review' Count is 8 versus 8

field induced gas delivery
no obvious relevant literature, $ eutilsnew -v -xml -out xxxx 'hemoglobin oxygen carbon electric field ' Count is 3 versus 3

wide selection of hemoglobin reviews
$ eutilsnew -v -xml -out xxxx 'hemoglobin "gas delivery"' Count is 3 versus 3

$ eutilsnew -v -xml -out xxxx 'hemoglobin review "gas exchange"' Count is 62 versus 62

Disputed
What is disputed? — Preceding unsigned comment added by 68.52.102.72 (talk) 19:01, 26 November 2011 (UTC)


 * A good part of what is written is not written clearly and that may lead to why some things are disputed. I am wondering about most of the "Ventilation" section.


 * The blood is subjected to a transient electric field (QRS waves of the EKG) in the heart, which dissociates molecules of different charge. The blood, being a polar fluid, aligns dipoles with the electric field, is released, a then oscillates in a damped driven oscillation to form Y or Osborn Waves, V, U, and Y waves. The electric field exposure and subsequent damped driven oscillation dissociate gas from hemoglobin, primarily CO2, but more important, BPG, which has a higher affinity for hemoglobin than does oxygen, due in part to its opposite charge. Completely dissociated hemoglobin (which will even effervesce if the electric field is too strong — the reason defibrillation joules are limited, to avoid bubble emboli that may clog vessels in the lung) enters the lung in red blood cells ready to be oxygenated.


 * This make no sense. An Osborn wave, also known as a J wave, is seen on an ECG in hypothermic patients, a U wave is a normal ECG variant, and a V wave is seen when observing jugular venous pressure (as is a "y" wave).  CO2 and O2 binding to hemoglobin is driven locally by pH and gas concentration (see Hemoglobin).  Defibrillation joules are limited because higher amounts directly damage the myocardium. I have never heard of cardiac electrical activity having any influence on gas exchange, so I suggest that this all gets greatly clarified and referenced.  Perhaps it should just be removed because it is far too technical and misleading for anyone using Wikipedia.--Kris (talk) 18:53, 30 December 2011 (UTC)


 * I agree and I removed it. &#124; pulmonological talk • contribs 04:10, 31 December 2011 (UTC)


 * This article is looking much better. The next section on pulmonary physics, I am wondering about some statements--and they may be right but they don't quite match my understanding.  I don't understand what the first sentence is trying to say--that pressures in the lungs are due to the atmosphere?  What about pressure changes with air movement?  I also thought that the drop in PO2 in the trachea and alveoli had to do with the mixing of the atmospheric air with air being exhaled, which seems to contradict the first sentence.


 * I also think the diffusion section needs a lot of work, as that is the crux of gas exchange, IMHO. It only looks at the CO2 side and not O2.  While it correctly states that CO2 binds to globin, O2 binds to the iron portion of the heme molecule.  The hemoglobin article does an excellent job explaining this in the Structure and Oxyhemoglobin sections.  Commonly CO2 is said to have 3 forms in the blood, 10% dissolved (the part that diffuses), 70% in the form of bicarbonate, and 20% bound to hemoglobin; so you can see that how it is written now is right but vague.--Kris (talk) 03:50, 2 January 2012 (UTC)

Edits on Feb 23, 2017
The summary states that I only added two new diagrams, but I then inadvertently pressed "enter", before completing the summary. I also changed the name of the section from "In humans" to "In mammals" as everything in that section applies to all the mammals and not just to humans. I also replaced some of the references with anatomical details gleaned from "Gray's Anatomy" which is a much more authoritative source than Tortora et al. I also added the medullary pH and CO2 sensor, which was somehow left out during the earlier editing efforts.

These improvements have now also been made to the Respiratory system article. Cruithne9 (talk) 10:47, 23 February 2017 (UTC)

Irregular use of symbols
The use of symbols in some sections is not the norm for use in prose in pages. It is for the use of equations and formulas. See fuller note on Breathing talk page.--Iztwoz (talk) 11:15, 19 June 2017 (UTC)
 * It actually goes against the guidelines see WP:CHEM Symbols - can someone change these ? --Iztwoz (talk) 13:27, 3 July 2017 (UTC)

Sum of partial pressures?
I thought that breathing involves essentially adding a C atom to an O2 molecule, thus the sum of partial pressures of O2 + CO2 should be constant. Apparently it's not. So what's my error? — Preceding unsigned comment added by Smurfix (talk • contribs) 08:38, 26 December 2017 (UTC)

Biology
Hahaha 103.125.177.6 (talk) 16:19, 9 November 2022 (UTC)

Earth and Life Science
reporting 2001:4454:59B:9600:DE6D:CDFF:FED6:2BBA (talk) 01:51, 3 December 2022 (UTC)