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1answer
19 views

Why are particulate matter toxic to humans?

There are many studies on fine particles (PM2.5) and their fully negative effect on human health. There doesn't seem to have any positive aspect of inhaling particles, except very particular ones, but ...
2
votes
1answer
30 views

What is the role of lamellar bodies in lung cells?

Lamellar bodies have been found to be secreted in lung cells many of their associated proteins have been identified. What is the current consensus or research on the function that these lamellar ...
3
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0answers
39 views

Are small CO2 concentrations devastating to certain cognitive tasks?

A new study shows strong effects of what should be a negligible CO2 concentration. The paper "Is CO2 an Indoor Pollutant? Direct Effects of Low-to-Moderate CO2 Concentrations on Human Decision-Making ...
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1answer
52 views

Breathing under water

Why can fish breathe under water but land mammals can't? How can fish extract oxygen straight from water but humans can't?
1
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1answer
26 views

Relation between respiration and concentration of citric acid

A and B are 2 reactions. If there is an excess availability of citrate, then which of the above reactions will prevail? I know that citric acid is formed when oxaloacetic acid reacts with acetyl ...
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0answers
61 views

In-Ear headphones increasing nasal breathing resistance

I figure this is a rather strange question, however, I noticed this quite some time ago and wanted to make sure that this is in fact a permanent condition before posting. The situation is as follows: ...
3
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4answers
79 views

how we don't breathe nitrogen when it makes the most of air?

How we don't breathe nitrogen when it makes the most of air? Why we are always tend to breathe oxygen,not hydrogen and nitrogen?
0
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0answers
19 views

How does vasomotor and bronchomotor reactions equilibrate local blood flow to correspond local ventilation?

I am trying to find some figure(s) to explain this. There is probably better name for "bronchomotor" reaction. They seem to opposite terms and actually affecting same things (alveolar diameter/tone); ...
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0answers
12 views

Respiratory protections against various pollutants

Obviously it's better than nothing, I live in a city, less polluted than the leaders like Hanoï, Shangai, etc.., but strangely, I already expressed it on this site, I have a sort of disproportionate ...
3
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2answers
107 views

Electronic cigarettes (e-cigs), any health risks?

Background: An electronic cigarette (e-cig or e-cigarette) is a battery-powered device which simulates tobacco smoking patented in 1963 by Herbert A. Gilbert. It generally uses a heating element ...
0
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3answers
184 views

Why do we exhale after we hold our breath?

I tested this out with my friends, and I find that after they hold their breath and can't hold it anymore, they exhale air, instead of inhaling air. Interestingly, they all try to inhale in as much ...
0
votes
1answer
37 views

Effect of respiration on Arterial pressure

I am trying to explain the effect of respiration on arterial pressure. I am looking preferably some visual way to show it. How can you show the effect of respiration on arterial pressure? I am ...
0
votes
1answer
23 views

Different level of toxicity between smoke

Has there been studies on the difference between the smoke generated from: cigarette or cigar manufactured by brands which are proven to contain more than a hundred of dangerous additional ...
1
vote
1answer
76 views

Breathing in and out

I was reading my textbook and it says that breathing involves inhaling and exhaling but it doesn't say whether they happen simultaneously or sequentially. Also is my overall understanding of ...
7
votes
1answer
233 views

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 ...
1
vote
1answer
46 views

Effects of smoking tobacco compared to inhaling other smoke

How much less dangerous is breathing smoke from burning wood and coal compare to smoking tobacco? Edit: Sorry. I should have made the question clearer. If this were an experiment, it would be set ...
0
votes
1answer
63 views

How does the matter that makes up the fat of your fat cells ultimately leave your body--following weight loss?

I'd like to get some clarification on specifically how the matter from the fat reserves of the Adipocyte physically leaves the body. In other words, if you were to somehow follow every atom in the ...
1
vote
2answers
140 views

What gases are needed for humans to breathe?

I will be beginning a science project about sustaining life on space stations. I already know that pure oxygen is harmful for humans but would $O_2$ + $CO_2$ be enough for humans to breathe in or do ...
2
votes
1answer
190 views

How does this diagram illustrate carbon cycling in lakes?

Could someone please explain the following process to me: This process refers to carbon cycling in lakes and is described in the context of $CO_2$ flux from lakes into the atmosphere. GPP is gross ...
2
votes
0answers
33 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 ...
5
votes
1answer
560 views

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 ...
5
votes
3answers
133 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.
7
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2answers
194 views

During famine, does the human body do anything to prioritize which organs receive nutrients?

When food is scarce, the body slows its metabolism. Are there any other systems or processes that encourage prioritization of organs?