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Questions tagged [breathing]

The physiological process of inhaling and exhaling air for the purpose of gas exchange in the lungs.

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Why does the upper respiratory tract not fill with water when diving?

When we swim, I know we close the some of the vestibular folds in the larynx part of the throat to hold our breath (and to avoid water from getting into the lower respiratory tract, I suppose). I ...
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Affinity for oxygen and carbon dioxide in animals

I'm currently reading Treatise on Invertebrate Paleontology (A) and don't understand the following fragment: The affinity for oxygen in lower animals is many times that in higher ones, whereas ...
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A day in Beijing is like smoking Only one sixth of a cigarette

This is the title of this blog post followed by this other good post. I'm particularly anti-tobacco-smoke, at the point of not always considering other pollution, and this article shows how this kind ...
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How much oxygen does a human need to breathe?

So, I know that the title isn't very precise, but so is my current knowledge of the subject. It begs the question of what unit are we talking or maybe percentage? Let me explain the situation. Earth'...
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How long could a shark breathe pepsi?

Sharks breathe seawater. Seawater isn't 100% pure water, but mostly water. Pepsi (other colas are available) isn't 100% pure water, but mostly water. How long would a shark be able to breathe if ...
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How is the human oxygen absorption dependent on the concentration of oxygen in respiratory air?

I just wanted to calculate the theoretical time span in which I could survive (conscious) in my apartment without letting the air on the inside exchange oxygen/carbon dioxide with fresh air. During my ...
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More *total* oxygen absorbed by breathing fast or slow?

I have heard that human lungs capture/absorb/process more oxygen by breathing slower. A) Is the above true? B) If so, if my primary concern was absorbing the most total oxygen (not most efficient), ...
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Oxygen dissociation curve and temperature

So, we have a container with a mixture of gases. The concentration of oxygen is $C_{oxy}$ and its partial pressure is $P_{oxy}$. Then we introduce a sample of hemoglobin(deoxygenated) in that ...
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Is it possible to stimulate the EPOC process?

On Wikipedia, EPOC is defined as: Excess post-exercise oxygen consumption (EPOC, informally called afterburn) is a measurably increased rate of oxygen intake following strenuous activity intended ...
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Is lowered blood pressure a primary lethal symptom of an opiate overdose?

When someone has a opiate overdose, they can have no or almost no pulse and can have shallow breathing or stop breathing. When you stop breathing (for example) by drowning, you can survive for a long ...
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Can oxygen deprivation damage the brain even before passing out?

I read that when suffering from cardiac arrest you pass out after about a couple of seconds and irrevocal damage starts to take place after about two minutes. (http://journalofethics.ama-assn.org/2009/...
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Abdominal muscles during inspiration/inhalation

During inspiration I am aware that the diaphragm and the external intercostal muscles contract, thus increasing the volume of the thoracic cavity. However, I read on my textbook that during ...