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Questions tagged [physiology]

Human physiology is the science of the mechanical, physical, and biochemical functions of humans in good health, their organs, and the cells of which they are composed. The principal level of focus of physiology is at the level of organs and systems within systems.

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Are sports drinks more effective at hydrating athletes than water?

A FiveThirtyEight article, You Don’t Need Sports Drinks To Stay Hydrated challenges that sports drinks help prevent dehydration or increase exercise and performance better than water. It claims that ...
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How sensitive are human ears?

I read about this on a question on Quora, and found a source for the fact below: When a pin is dropped, the sound reaching the human ear causes the eardrum to move by a distance less than the ...
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Can a trained human eye catch microexpressions?

Microexpressions were validated in this question: Do involuntary "microexpressions" betray liars? But can a human eye (as opposed to a frame by frame analysis of a high-speed video) detect ...
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Does the nose stop smelling a scent after a few minutes?

A teacher once told me that after detecting a new scent, you will only be able to smell it for a few minutes. Is this true? If so, why? What is the precise length of time one can smell, and does it ...
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Will taking yeast infection medication build resistance if one doesn't have a yeast infection?

A female friend recently commented that women should never self diagnose yeast infections because if they don't actually have one and proceed with some kind of treatment, some kind of resistance will ...
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Can one permanently enlarge their breasts with the use of a breast pump?

There are many websites and products online that claim to have ways to enlarge a female's breasts. One common technique that they use is simply a vacuum pump. There's no denying that these temporarily ...
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Are bodily deficiencies “mapped” to facial acne?

There's a picture and body of text making its way through Tumblr again: What is your acne telling you? 1 & 2: Digestive System — Eat less processed or junk food, reduce the amount of ...
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Can you tell someone has seen combat by looking at their face?

There is a common claim that, by looking into the face or eyes of a person, you can see that they have seen combat, or other traumatic events. It is particularly mentioned in movies, songs and poems. ...
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Does training while wearing weights improve body performance?

Everybody has heard about training while wearing weights in different parts of your body: ankles, arms, torso, etc. There are many references in cartoons that treat about Martial arts like the ...
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Is 1,7% of the population born intersex?

Article published by the BBC claims: Although there are no reliable statistics on how many Kenyans are intersex, doctors believe the rate is the same as in other countries - about 1.7% of the ...
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Do red-headed people feel pain differently?

There is a long-standing belief among anaesthsetists that people with red hair need more anaesthetic. There even appears to be some evidence. to back up this widely held idea. Recently, though, a ...
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Are only 5% of Americans naturally blonde?

In his phenomenally thorough study of what the typical porn star looks like (see Is the typical female porn star a big-boobed blonde?) John Millward mentions in passing that: only 5% of Americans ...
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Does the body get rid of alcocol first before metabolizing food?

In her article The Top 8 Metabolism Myths, the nutritionist of Fitbit writes Go easy on the booze, too; your body will focus on getting rid of the alcohol first, before metabolizing the food. Is ...
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Do you bleed more when drunk?

While my friend was getting a tattoo the tattoo artist said you'll bleed more because you're drunk. Is this true?
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Can people castrate reindeer by biting off the testicles?

This Youtube video depicts a Sami woman castrating a reindeer by biting off the testicles (although the moment suprême is not shown explicitly): Laplander Reindeer Castration (warning: video depicts ...
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Is the typical female porn star a big-boobed blonde?

Common opinion seems to believe that the most popular female porn stars are blonds with big boobs. For example, this site from 2010 has Jenna Jameson as the most popular and she fits the description. ...
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Do metal items stick magnetically to “Magnet Boy”?

In the past week or so there have been several news articles from major news sources including this one from CBS about a boy that has apparent magnetic powers (metal things stick to him). Is it ...
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Can mobile apps monitor your sleep cycles?

There's already been a question about devices that can help you monitor your sleep and their possible benefits, but I'm interested specifically in the apps for mobile devices that claim to be able to ...
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Does running, short or long distance, cause muscle loss?

I often hear the claim that running promotes muscle loss. To what extent is this true? If a person is a triathlete don't they need both cardio and muscle? Does it matter what distance is run and the ...
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Do bodybuilders achieve 2-4% bodyfat percentage during competition?

Wikipedia says: Certified personal trainers will suggest to male bodybuilders that they aim for a body fat percentage between 2–4% by contest time. However it is unclear that such levels are ever ...
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Does cutting or shaving the hair of infants cause better hair regrowth?

An earlier Skeptics Stack Exchange question asks: If you shave or wax, will the hair grow back stronger or thicker? However, I am interesting in a more specific claim: that shaving the head of an ...
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Can canning tomatoes while menstruating spoil the tomatoes?

My wife was recently canning tomatoes, and her aunt asked if she was on her period because supposedly that will ruin the batch. Her grandmother is the one that taught her aunt, but neither of us had ...
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Were giant human bones discovered in Castelnau?

French anthropologist Georges Vacher de Lapouge (1854 - 1936) reported in 1890 the discovery of "the Giant of Castelnau" - giant bones in neolithic tombs, in southern France. According to Mr. de ...
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Has a human baby's heart started beating only 18 days after conception?

I saw billboards like this driving around Florida: 18 Days from conception my HEART was beating [...] Prolife Across America Is this true?
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Does getting a running start increase your vertical jump?

Many people believe that a run-up helps them to jump higher. Is this true? (While it seems natural to do this, I'm having trouble believing that horizontal speed can help one jump vertically.)
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Are there as many neurons in the human gut as there are in the head of a cat?

I've got a gut-related condition and saw this claim on the BBC [The stomach's] complex work is under the control of what's sometimes called "the little brain", a network of neurons that line your ...
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Does raising your arm in the air help when you are coughing/choking on something?

When I was younger I once choked on some food and started coughing heavily, my Dad then told me to raise my arm in the air in order to "help raise the diaphragm". It actually helped with the coughing ...
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Do pregnant women “glow”?

In fiction it's as common as dirt to hear "you're glowing" as a response to news that someone is pregnant or an indication of it without it being said. This doesn't seem to be limited to just ...
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Do hares chew cud?

In Leviticus 11:6, a hare is referred to as a "chewer of the cud." What evidence is there on this matter? It is not necessary, strictly speaking, that the evidence be on chewing cud in the same sense ...
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Does clapping children on the back in certain positions help clear mucus from their lungs?

Chest Physical Therapy (CPT) is the practice of clapping children on the back to clear mucus out of the lungs. FairView (a Minnesotan non-profit health site) recommends it for chest infections. ...
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Can humans functionally move their eyeballs independently of one another?

Recently I see a lot of links to Ed Macy's book "Apache" (related from Google glass articles' comments). It took me two years to learn how to "see" properly -- how to see in an Apache World. I ...
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Are sea salt soaks beneficial for healing a body piercing?

Aftercare suggested for healing a new body piercing almost always includes a sea salt soak. Wikibook's Body Piercing Aftercare explains the process. 'SSS (Sea Salt Soaks)' – With this method you ...
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Is this 10 pack real?

I saw this video where a guy shows he has a 10 pack. Then in the comments people explain the human body only has 8 ab muscles. Some claim the bottom two muscles are implants. Can this be real, or ...
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Do cold baths prevent flu?

A coworker of mine said that he never get any flu because he takes cold baths. I found this (very pseudoscientific-like) link defending this theory: https://ownyourhealth.wordpress.com/2007/09/20/...
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Do the types of food affect a calorie restricted diet?

Can food type have any effect on weight loss even though net calories would remain constant? For example, The Fast Diet FAQ, which is a diet based on Intermittent fasting, contains the following ...
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Can eating sugar result in addiction?

I am surprised to see this video on TED claiming that sugar can lead to addiction (differently from other kinds of food, for example broccoli). So, yes, over-consumption of sugar can have addictive ...
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Can sighted people learn to read braille by touch at a level comparable to blind individuals?

I've been told by a friend who works at a school for the blind that no sighted person has ever learned to read braille by touch at the level that is comparable to a literate blind person. Is this true?...
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Is yogurt affected by human emotions?

The documentary I Am (Wikipedia) (YouTube video) makes a number of claims, including that more signals are sent from the heart to the brain than vice-versa, and that the your emotion or mood can have ...
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Would an eyemask obscure a persons identity?

Often in movies and comics characters wear a simple mask around the eyes, which seems successful at hiding their identities. Examples would be Zorro, Green Lantern, Robin Image source Is there any ...
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Can a woman lift a 1.5 ton car?

The Christian Post A woman lifted a car to save her dad, according to reports in an amazing and daring rescue. L. K. is reported to have lifted the 1.5 ton car [BMW 525i] off of her father in an ...
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Does rubbing a bruise help against haematomas?

My parents always told me to rub firmly directly after I bruised myself, say after a hit with a blunt object (without damage to the skin). The explanation would be that this helps against haematomas ...
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Is it possible for thin weedy guys to look muscular like Arnold Schwarzenegger?

Quite often you can see guys slaving away at the gym, slurping on protein shakes or pounding the pavement. There are also frequently seen ads around the net with a simple animation of a thin guy ...
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Are 75% of cells in the human body non-human? [duplicate]

A recent issue of the Swiss popular science magazine "Beobachter Natur" contains an article about microbes in which the following claims are made: 75% of the cells in our body are non-human, however ...
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Does lifting weights inhibit growth in kids?

I have a teenager at home, who is itching to pull weights in a gym. He is training to be a sprinter, so I see the benefits of power and strength training, but am worried, as these are his growing ...
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Does the alcohol content of drinks make you fat?

One of the many arguments used to try and persuade us to drink less is that the calorific content of alcohol contributes to obesity. For example, this article from the UK NHS Choices website argues, ...
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What is the Atacama Humanoid?

The Atacama Humanoid is the skeletal remains of a 6-inch (150 mm) humanoid found in the Atacama Desert of Chile in 2003 There have been many different claims as to its origin, including: a ...
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Does the “4-7-8” method help to fall asleep faster?

The "4-7-8" technique involves controlling your breath for a brief time to encourage falling to sleep faster. Each number consists of the period of seconds you spend during a certain part of ...
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Can the size and shape of penis be enhanced permanently?

A very good friend of mine went to the UK for his master's two years ago. After his breakup and several hookups (via online dating sites), he told me that he is very depressed, especially after one of ...
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Can anxiety increase body odor?

CalmClinic writes in Anxiety and the Connection to Body Odor: One of the main problems with the physical symptoms of anxiety is that many of them cause further anxiety. That's why so many people ...
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Can decompression after diving cause you to explode?

On the tv show "1000 Ways To Die", a death that is mentioned (Season 1, episode 10, death #710) claims that a girl exploded from what would seem to be decompression poisoning A female scuba diver ...