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Absorbtion of foreign bodies through the alveoli

What is the maximum size of a substance which can pass into the body through the alveoli?
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33 views

What are the 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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41 views

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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1answer
38 views

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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2answers
52 views

Bohr effect in respiration

Would I be correct in saying that the Bohr effect is ONLY related to the concentration of [H+] in the tissues. Obviously the concentration of carbon-dioxide can contribute to this concentration by ...
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1answer
26 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 ...
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1answer
42 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 ...
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44 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
68 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?
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1answer
28 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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153 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: ...
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4answers
112 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?
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21 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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14 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 ...
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2answers
135 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 ...
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1answer
227 views

What are the highest and lowest possible pH, paCO2 and HCO3 in the blood of living human?

What are the highest and lowest possible values of pH, $paCO_2$, and $HCO_3$ in the (arterial or venous) blood of a living human being?
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3answers
314 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 ...
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1answer
38 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 ...
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1answer
25 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 ...
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1answer
109 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 ...
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1answer
373 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 ...
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1answer
55 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 ...
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1answer
65 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 ...
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2answers
180 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 ...
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1answer
228 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 ...
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1answer
50 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 ...
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1answer
949 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 ...
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3answers
140 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.
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2answers
209 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?