Biology Stack Exchange
Biology Stack Exchange

Questions tagged [human-physiology]

For questions on the biochemical, physical, and mechanical functioning of humans in good health including their organs and cells.

Human physiology is the science of the mechanical, physical, bioelectrical, and biochemical functions of humans in good health, their organs, and the cells of which they are composed. Physiology focuses principally at the level of organs and systems. Most aspects of human physiology are closely homologous to corresponding aspects of animal physiology, and animal experimentation has provided much of the foundation of physiological knowledge. Anatomy and physiology are closely related fields of study: anatomy, the study of form, and physiology, the study of function, are intrinsically related and are studied in tandem as part of a medical curriculum.

-Wikipedia: Human Body -> Human Physiology

See also

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Why does eating saturated fat increase blood cholesterol?

I am interested in the biochemistry of diet and the way we have been advised to eat for the past forty years. In researching an explanation for the relationship between dietary fat and blood cholesterol I came across the following: "It is clear that…
adlibber
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How is epinephrine and norepinephrine different?

Is there any difference between epinephrine and norepinephrine? https://www.quora.com/What-is-the-difference-between-epinephrine-and-norepinephrine This site says that norepinephrine is also a neurotransmitter. Is there any major difference between…
user29535
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Why do I have super vision in purely red light?

I installed some RGBW led strips in my apartment recently.. by some I mean everything is now lit by led strips and there isn't a single light bulb left. One thing I've noticed over the last few days is that my eyesight is significantly sharper in…
user81993
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Why does rapid decompression make you lose useful conciousness so fast?

I was watching Smarter Every Day's episode on hypoxia, and it had an interesting chart that suggested that at 35kft, you have less than 10 seconds of useful consciousness. This number seemed low, and I'd like to know why. I have two pieces of…
Cort Ammon
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What happens when the parietal cells of gut epithelium becomes partially non-functional?

The options are a) The pancreatic enzymes will not work properly b) The pH of the stomach will fall abruptly c) Steapsin will be more effective d) Proteins will not be adequately hydrolysed by pepsin into proteoses and peptones. The answer is D…
TheNewGenGamer
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Has electrical activation, rather than mechanical tension been investigated as a direct trigger for hypertrophy?

Three of the most common theories for what induces hypertrophy are mechanical tension, muscle damage and metabolic fatigue. The prevailing theory at the moment is that mechanical tension is the main mechanism for inducing hypertrophy, with the other…
F Chopin
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Why do animals yawn? What is the biology behind it?

We yawn whenever we are tired and body needs rest. Why does the mouth open wide and a large volume of oxygen is inhaled?
Sucharita Chatterjee
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Why don't we dribble tears through our nose?

Basal tears are tears produced by the lacrimal gland and they lubricate the eye. They are then funneled into the lacrimal sac and then from there into the nose eventually. If this is the case, why don't we constantly dribble out tears from our nose?…
John Hon
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Was there a time in Earth's history when some animal life existed on land but humans could not have breathed?

I understand that higher oxygen content allowed insects and arachnids to grow much larger than today and I wonder if this additional oxygen would have been toxic or unhealthy for modern humans?
releseabe
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Why are human wastes yellow?

Except for the feces, which is more brownish, all the human wastes (urine, earwax, snivel, phlegm, and rheum) are usually yellowish. Why is that? I heard that urine is yellow due to bilirubin(?). What about others?
Septacle
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Sensory-motor pathway from visceral organs

Does anyone know is which nerves carries the transmission of sensory-motor impulses from the visceral organs? Is it splanchnic nerves? There is conflicting evidence in the literature. On the one hand, many sources told that splanchnic nerves belong…
musinn
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Which components grow in size but not in number and which grow in number but not in size?

During growth of an individual animal some components of the body grow in size but not in number (type 1) while some others increase in number but not in size (type 2). Which of the following is correct? (A) type 1: bones and muscle cells; type 2:…
Fenil
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How does the stomach differentiate between liquids and solids to initiate churning?

Or maybe it doesn't at all. Can the stomach tell the difference between liquids and solids and change its churning process accordingly despite that it has no nerves? Because liquids don't need to be churned, so I figure there's a chance animals, or…
Vane Voe
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Is there gas exchange in the fingers?

I saw A documentary many years ago that said that hemoglobin will take in O2 in the fingers and toes. I have Not been able to find any information on this. But it would seem that being so close to the surface some gas exchange would occur, and more…
John Dalgoon
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Immune response to shock

I am studying nursing and have a question regarding the physiological response to shock (decreased perfusion). In lecture notes supplied by the lecturer, he indicates that there is a neural, hormonal and immune response to shock that is…
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