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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 does chest wall compliance affect functional residual capacity (FRC)?

The functional residual capacity is made up of expiratory reserve volume (ERV) plus the residual volume (RV) - i.e. the volume of air remaining in the lungs after passive expiration. Compliance of ...
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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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64 views

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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167 views

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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141 views

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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93 views

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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How can alveolar gas contain water vapor and less oxygen if the breathing loop is isobaric?

I was wondering why the partial pressure of oxygen is lower in the alveoli than in the air we inspire. From this related question I found the answer that the water inside the lung saturates the air ...
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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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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 ...