Questions tagged [human-physiology]
For questions on the biochemical, physical, and mechanical functioning of humans in good health including their organs and cells.
291
questions
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16 views
Why is it harder to pee after sitting in a car for many hours?
During car rides as a passenger I can't pee as easily as when I'm home. Why?
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6 views
Using EMG to measure increases in strength
I have a DIY EMG kit and I know it can be used to measure muscle activation. I am wondering, is there a relationship between muscle strength and the value obtained from the EMG sensors measuring on ...
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9 views
Are doTERRA essential oils supposed to be swallowed? I don't, but dad does [closed]
He believes that because their oils are expelled mechanically instead of chemically, they're safe to swallow. I tell him that any essential oil from any company is not meant to be swallowed because it'...
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0answers
24 views
What adaptations does the human body have to handle frequent and sustained changes in orientation?
Most animals are horizontal with the ground. When they lie down, they get closer to the ground, but their orientation does not change.
Humans, on the other hand, stand up straight and tall, ...
2
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1answer
39 views
RE: Fasting gastric pH vs Normal gastric pH
If fasting gastric pH values are more acidic then why is it recommended to eat no more than three hours before bed time to prevent reflux. It seems at some point during sleep the stomach would become ...
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0answers
17 views
Biochemistry of pleasure of/desire for physical exercise in mammalians and humans?
Are there some known biochemical mechanisms, that induces desire for/pleasure of physical exercise in mammalians and humans? I have heard, that horses can not live without physical exercise and they ...
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36 views
ATP and Muscle Contraction
I have a question regarding how molecular interactions manifest in physical actions - such as hanging from a bar. To the best of my understanding, when it comes to the contraction of muscles, ATP is ...
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0answers
17 views
Why people feel more sleepy while doing something that's not interesting even when they are not actually tired? [migrated]
We often see people and students yawning while reading a boring course book. But, when told about something interesting, their sleepiness vanishes.
Why and how does this happen? What are the exact ...
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19 views
For how long can the heart be in asystole and then restart itself?
The medication Adenosine is used for the treatment of some abnormal heart rhythms. However, according to Wikipedia, it can cause asystole for a few seconds:
Because of the effects of adenosine on ...
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18 views
Do tendons thickened due to a tendon injury/pathology have the same strength as “normal” tendons?
I read in this 2015 study {1}:
This study
is the first to show that pathological tendons have sufficient levels of aligned fibrillar structure. Pathological
tendons may compensate for areas of ...
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0answers
31 views
How do painkillers prevent shock?
I was reading about the Placebo effect and came across this little story:
The roots of the placebo problem can be traced to a lie told by an
Army nurse during World War II as Allied forces ...
1
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1answer
39 views
Passing out from drowning [closed]
How long does it take to pass out from oxygen deprivation? The person is panicked and screaming so they accidentally breathe water into the lungs. So how long would it take for them to pass out? After ...
0
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1answer
69 views
Sleeping Pill Overdose
How does an overdose of sleeping pills kill?
What are the body's reactions to an overdose?
In an article published in ScienceDaily, I read that "Sleeping pills owe half their benefit to the placebo ...
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0answers
79 views
What is the significance of different types of papillae present on tongue?
Fungiform, Circumvallate, Filiform, Foliate Papillae are present on the surface of the tongue. They have a role in increasing surface area for taste buds that can be accommodated on the tongue. Each ...
1
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1answer
99 views
Why does histamine cause bronchoconstriction?
What purpose does histamine-caused constriction serve in lungs during allergies and such, since it's vasodilator in other parts of body. Wouldn't it be more practical to vasodilate lungs so that white ...
1
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1answer
56 views
How are testosterone levels distributed among men and women?
Wikipedia tells me that men have 7 to 8 time higher levels of testosterone than women, on average.
Since the hormone is linked with performance in certain athletic events, my hypothesis, which I ...
2
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2answers
54 views
Is it impossible to increase skeletal bone mass, as opposed to just bone density? [closed]
I've heard exercise and resistance/strength training increases the density, but doesn't increase mass. So basically, experimentally or theoretically possible at least, can modern science do this/is it ...
0
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2answers
38 views
After how many hours water drunk is expelled from the body?
If one drinks a liter of water at 7 am when (in what span) will that water be eliminated through uresis?
Is that process influenced by any factors such as empty stomach, sleep or other?
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1answer
79 views
Coronary circulation
It is said that the coronary artery that gives the posterior descending artery(PDA) determines if the heart is right dominant(most cases) or left dominant. Is there any reason to this? Why PDA?
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11 views
Can disorders involving involuntary muscle twitches and spasms have a hypertrophic and increased residual muscle tension effect?
Meaning disorders specifically like myokymia, myoclonus (positive and negative) and fasciculations. From the section of the literature I've seen, sometimes passing mentions are made when the disorder ...
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25 views
Why different people have different Sympathetic reaction
We all know that sympathetic mechanism is similiar in humans . Why people react differently for example one may ran after seeing a lion while other may keep standing or may shout without escaping ?
0
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1answer
65 views
Is it correct that the nicotinic acetylcholine receptor has nothing to do with Dopamin?
As I know Dopamine is almost exclusively produced via metabotropic receptors, is it possible for a nicotinic ACH receptor to influence a dopamineric neuron?
Can a nicotinic ACH receptor cause a ...
1
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1answer
26 views
Can motor neurons in the brain stem start movements?
Supposedly (consciouss) movement is started in the cerebral cortex. But some time ago I've read a research which stated it might be possible some movements (not specified which ones, probably mean ...
2
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1answer
57 views
Does every protein starts with Methionine amino acid [duplicate]
During process of protein synthesis we need AUG Codon to start translation .As we know this codon codes for Methionine amino acid so can we say that every protein starts with Methionine amino acid ?
7
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1answer
713 views
Why clotting does not occur during Menstruation
As we know when we get injured our body's clotting systems stop the bleeding. So why does it take days for menstruation to stop ?
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0answers
15 views
In oscillometric blood pressure measurement, why do we assume that highest oscillations correspond with mean arterial pressure?
As far as I've seen, the point on the oscillometric curve where there are greatest oscillations represents the mean arterial pressure (MAP).
My question is - why? What is the logic behind this ...
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36 views
Sulforaphane vs. Hyperthermic conditioning (sauna use) which would induce a greater heat shock response in the human body?
I’m curious to know which would induce a greater upregulation of heat shock proteins, consuming sulforaphane or putting the body through heat stress such as using the sauna.
Sulforaphane reference- ...
0
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1answer
69 views
Is it possible for human beings to feed through the nose?
There is a prediction on a futurology site that food can be eaten by inhalation
https://2050.earth/predictions/smell-can-feed-you
Although aerosol foods do exist they are still eaten by the mouth.
...
4
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1answer
92 views
When does the brain stem appear in humans?
This article states:
Once the neural tube closes, at around week 6 or week 7 of pregnancy,
it curves and bulges into three sections, commonly known as the
forebrain, midbrain and hindbrain. ...
2
votes
1answer
40 views
How is fructose absorbed into the body
I’m finding contradicting methods of Fructose transfer to blood
page no 264(10)One of which saYs fructose is absorbed by simple diffusion
And another sources like this say that fructose is ...
5
votes
2answers
151 views
Why is urea not converted to ammonia in the body?
After the liver processes metabolites to produce urea and other by-products, these travel in the blood to the heart, then they are oxygenated, and some travel through the renal artery to the kidneys.
...
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0answers
20 views
Pulse Oximetry, what significance does a decimal place hold?
I work in a sleep research lab. We have a couple of Masimo pulse oximeters that report pulse oximetry values in terms of integers (e.g. 90, 91, 92, etc.).
Now our principle investigators used to use ...
5
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0answers
79 views
Why do children not have the Acid Mantle?
Post puberty humans begin to secrete a substance called Sebum which changes the neutral PH of our skin from ~7 to 4.5-5.5. This has that advantage of serving as a protective line against pathogens and ...
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1answer
49 views
human body in an environment where temperature is above body temperature
What would happen if humans were to live in an environment where the temperature is above the body temperature?
Does the human body have a mechanism to cool the body?
When the surrounding ...
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0answers
62 views
Does our brain use up more ATP after smoking cannabis?
kind of an amateur here.
If the firing of the neurons' signals uses up some ATP, and smoking cannabis makes them fire off more quickly, do our brains use up more ATP to sustain that rapid firing?
3
votes
2answers
76 views
Reaction of the body to heat
In massage school we are being taught hydrotherapy -- applying cold and heat to specific areas.
It says that when applying cold, first the body goes through vasoconstriction, and then later ...
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1answer
110 views
Is there any way bicondylar/bigonial, bizygomatic or bitemporal breadth can change in adults?
Without cosmetic surgery or etc., are there any cases/example wherein a human adult has had a change in significance regarding these regions of the face? I have seen many anecdotes where people have ...
1
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1answer
55 views
How deep could a human swim with SCUBA apparatus?
Using normal SCUBA apparatus and wet suit, how much pressure can the human body withstand? This is assuming that they descend as gradually as necessary for their body to make adjustments. What would ...
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0answers
12 views
Contracting mouth muscles as reaction to taking in specific food items
When eating very specific food items, especially confectionery like (salty) liquorice, (it feels as if) the muscles of my mouth contract, right when it hits my tongue.
Does anyone know why this ...
4
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1answer
112 views
Can the heart generate its own rhythm independent to the SAN?
My textbook and a revision guide, which I believe is a reinterpretation of the textbook, state that:
The SAN initiates waves of excitation that usually override the myogenic action of the cardiac ...
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0answers
36 views
human sight at 1000x while looking into the mirror [closed]
I noticed that my eyeballs have the ability to see in what appears to be 1000x.
Setting the conditions: Look into a mirror while in a well lit room. (for me the lighting in my living room as opposed ...
2
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1answer
31 views
Effect of the same caloric intake of different macronutrients on body weight
To gain weight, caloric intake > caloric expenditure.
To lose weight, caloric intake < caloric expenditure.
But what is the effect of the type of macronutrient ?
That is to say :
does the same ...
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3answers
175 views
Why do our bodies maintain blood pressure but not the flow rate?
This might be a silly question but i'm not not clear
I'm always told that blood pressure is homeostatic parameter and can't not be changed but isn't what important is the flow rate to the organs? ...
0
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1answer
124 views
Where would vegetarians/vegans get a substitute of hemo/myoglobin from?
As far as I understand, there is a difference in the iron absorbed from meat than from other sources like grains and vegetables.
If this is the case, is it possible that not ingesting the hemoglobin ...
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0answers
24 views
Do the normal in vivo spatial growth controls, not apply to hair follicles?
The common changes in hair growth are linked to changes in the size enlarging anagen follicles achieve. According to the accepted science in tissue physiology, the in vivo growth of the anagen ...
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0answers
82 views
Which major salivary gland secretes maximum amount of salivary amylase and which one secretes maximum amount of Saliva
Actually I was studying about digestion and got this confusion about which gland(Parotid or Sub-mandibulary) secretes maximum amount of saliva and which one maximum amount of Salivary Amylase.
Also,...
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0answers
63 views
Is there any evidence that Vitamin K-2 megadoses increase bicondylar, bizygomatic or bitemporal breadth in humans?
Can megadosing or supraphysiological dosing of Vitamin K2 (MK4;
Menatetrenone) over prolonged periods of time cause an adult's bicondylar breadth, bizygomatic breadth or bitemporal breadth to grow ...
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0answers
9 views
How is the “sampling time” of the human visual system influenced by things like hormones, metabolism, or our circadian rhythm?
For example people experience time passing slower when they are in a adrenalin rush. What is the mechanism behind it, and where can I read more about it ?
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19 views
Plasmatic anion gap or chloremia?
Since high anion gap metabolic acidosis is characterized by normal blood chloride levels and normal anion gap metabolic acidosis is characterized by elevated blood chloride levels, why it is necessary ...
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37 views
High altitude rail travel
This question is primarily about human performance. I do know about hypoxia, hence this question.
I'm busy designing a fictional region, currently in the 1930's. I have a railway line that climbs to ...
