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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567 views

Does consuming foods rich in phytic acid prevent mineral absorption?

I've seen a lot of articles warning that consuming phytic acid can prevent the body from absorbing minerals. They recommend soaking beans, chickpeas, lentils and other phytic acid foods before cooking ...
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Do swimmers' lungs use oxygen up to 3 times more efficiently than an average person?

I've come across a statement which is the following : At their peak, swimmers' lungs will use oxygen three times more efficiently than an average person. First time I saw it was on wikihow's page ...
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Different Human species? [closed]

Are humans only one species or Africans, Asians, Europeans, Mongolians etc are different species? They differ drastically in appearance.
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Does exposure to cold make body fat easier to burn? [duplicate]

The Facebook pages Weird Facts and WTF recently posted this image. Exposure to cold makes body fat easier to burn. Scientists found that putting ice packs on problem areas can burn extra calories. ...
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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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Are sexual/romantic characteristics correllated with blood type?

I saw this assertion on many sources, here's one: http://www.japanzine.jp/article/jz/521/love-sex-blood-types Many Japanese people believe that just as different blood types are incompatible, so ...
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Do certain colors fatigue eyes faster?

This UX.SE question about the use of bright pink in graphic design prompted an answer that says it should not be used because “it hurts the eyes.” It cites a Color Matters website about this, and ...
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Do male human brains have better global efficiency than female human brains and female brains have better local efficiency in the right hemisphere?

Wikipedia writes in Lateralization of brain function: Significant differences between male and female hemispheric rivalry and dominance have been established. Male brains have significantly better ...
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Does soaking in natural hot springs have any health benefits when compared to soaking in heated non-spring water?

There exists a common belief that soaking in natural hot springs has significant health benefits. For example, Hotelexecutive.com claims that: So What Exactly Can Soaking in Natural Hot Springs Do? ...
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Does alcohol make you warmer? [duplicate]

A lot of people seem to think that they can walk around in t-shirts in midwinter after having a few drinks, and people often feel warmer after drinking alcoholic drinks. However, are they actually ...
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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 with ...
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Does sleeping together naked help stay warm?

In a bunch of films and other entertainment, when characters find themselves in a cold place with no heating but must sleep, they conclude that to stay warm, they should sleep as close to each other ...
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Does hair fall first from the top of head because of reduced blood supply due to lack of movement?

In this very quackery-like video, it's claimed that hair loss occurs first from the top of the head rather than the side because the latter moves when chewing or doing other facial movements. This ...
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If one man is shot in the head while holding a gun to another man, can the former get a shot off on the latter?

In the movies, the following situation is routine: One man is hunting down another. Upon locating him, the hunter points his firearm at the hunted's head at close range. At this very moment, an ...
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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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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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Does the Graston Technique effectively treat limited mobility due to scar tissue?

The Graston Technique is a form of "cross fiber" massage with a metal instrument. The Graston Technique® incorporates an evidence-based form of instrument-assisted soft tissue mobilization ...
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1answer
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Does locking one's knees lead to fainting?

I have been told that locking one's knees can lead to fainting or passing out, and if you need to stand for an extended period of time you should always avoid standing and not lock your knees. I just ...
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Does not wearing a coat when it's “cold” out make you sick? [duplicate]

I live in Maryland, where today it was about 50°F. I have heard this before, but my parents told me to wear my coat outside at school because the cold would "make me sick." Is it really true that ...
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1answer
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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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766 views

Can you tell someone is hungry based on stomach rumbling?

The stomach rumble (clearly audible sound caused by the digestive system's movements) is a common phenomenon, often believed to be indicative of hunger. It is also a common trope used in fiction to ...
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Do sports drinks such as Powerade and Gatorade help prevent or shorten hangovers? [duplicate]

Does drinking Powerade or Gatorade before, during or after consuming alcohol help prevent or eliminate hangovers? According to this article a pilot study was done that found nothing can help hangovers ...
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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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Is it possible to increase the breast size of a woman through massage?

Caitlin MacKenna writes in Increase a Cup Size in 30 Days with Breast Massage: If you massage your breasts for 20-30 minutes a day, they should grow one cup size larger in 30 days. Massage does two ...
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Does defecating while sitting cause more strain than squatting?

This commercial1 from "Squatty Potty" claims that evacuating stool in a seated position is suboptimal for humans because we have a muscle that partially pinches the colon when seated. They claim that, ...
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Getting ill because of staying in a draft/draught?

In Germany it’s a common belief that drafts/draughts can make you ill. Because of that, car and train windows typically get/stay closed, even when it’s really hot; and, for instance, on a warm day in ...
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Do Vacuum Constriction Devices (penis pumps) work 50-80% of the time for erectile dysfunction?

The authoritative WebMD site has an article Erectile Dysfunction: Vacuum Constriction Devices: A vacuum constriction device (VCD) is an external pump with a band on it that a man with erectile ...
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Is any unconscious person capable of full splits?

The following popular article on stretching claims that lack of flexibility is purely neurological (or even psychological) and that [almost] any unconscious person would be very stretchy, e.g. can be ...
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Does eating certain food types alter your body temperature?

Many articles claim that some foods will lower your body temperature, or prevent you overheating, and others will warm your body temperature. Some of the temperature-lowering claims are due to the ...
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Pedometers / fitness trackers and setting stride length from your height - how accurate? [closed]

Looking at a couple of pedometer instruction leaflets, from different manufacturers, and spotted that they both suggest you can approximate your stride length from your height via the following ...
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Does drinking coffee or tea dehydrate you?

It is widely claimed that despite being made mostly of water, drinking coffee or tea will actually dehydrate you, because the caffeine is a a diuretic. Here is an example from the SFGate news site ...
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1answer
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Does sleeping on your left side improve digestion?

Does sleeping on the left side improve digestion? This article claims that it does, is there any truth to it? http://www.healthylifetricks.com/this-is-why-you-should-be-sleeping-on-your-left-side/ ...
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Can a camera flash blind the eyes of a baby?

This story in the Daily Mail talks of a case where a newborn baby lost its eyesight due to the camera flash. Doctors said the three-month-old, who has not been named, has suffered irreparable ...
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Will stretching help me have lean, shapely muscles? [duplicate]

I read that after exercising, we should stretch our muscles so that they won't be bulky but instead be long and lean. Is this true? Edit: The question is more about aesthetics than whether stretching ...
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Is female squirting involuntary urination? [closed]

During sex some women have a phenomenon called squirting that happens, when they release a large amount of fluid during sex. Recently I have been seeing people stating that squirting is involuntary ...
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Was this video about a person who can withstand electricity staged? [duplicate]

This video, which is apparently by History.com Channel, shows a man called "Electric Mohan" from Kerala, India who doesn't get harmed when electricity flows through him. Is it possible for any human ...
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1answer
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Does your brain keep thinking for seven minutes after you die?

There is a widely published meme that you keep thinking after you die: After you die, it is believed that you have 7 minutes of brain activity left inside you Obviously it doesn't hold true if one ...
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1answer
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Can someone get pregnant merely by using the swimming pool?

This Daily Mail story says that a woman went to court as her daughter got pregnant by swimming. A mother is suing a hotel claiming her teenage daughter fell pregnant simply from using a hotel ...
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3answers
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Do dietary vitamin supplements like Berocca help improve mental performance?

Berocca is a dietary supplement containing mainly B vitamins and a large dose of Vitamin C. Here's a listing from their website for Berocca Perfomance: Vitamin B1 15 mg Vitamin B2 15 mg ...
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1answer
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Does chugging Gatorade before going to sleep prevent a hangover in the morning?

Is drinking Gatorade after a night of drinking an effective method for preventing hangovers? A Forbes article claims: You not only lose water when you booze, you also dump electrolytes. These ...
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Is this shoe lacing technique effective at preventing blackened toe nails?

See: Reddit: LPT: How to lace your running shoes (June 7, 2015) Reddit: Black toes from ultimate? (May 20, 2015) Runner's World: How To Lace Shoes: Prevent Black Toe Nails (March 4, 2011) They link ...
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Did an experiment show none of 680 Air Force cadets were of “average” size?

Various workshops given by Nielsen-Norman Group in the User Experience field, mention a specific experiment that involved Air Force cadets. The experiment is meant to illustrate the point that there'...
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2answers
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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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Does giving a drug to a former addict cause reestablishment of chemical dependence?

Joel Spitzer, an anti-smoking counsellor, claimed on whyquit.com that there is a law of addiction which is: The law of physiological addiction states administration of a drug to an addict will ...
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The Yogi that Never Eats, is it true? [duplicate]

A few years ago a yogi from India made the headlines claiming that he hadn't eaten for over 7 decades. It was said that he was under observation for 2 weeks in a hospital and allegedly was never seen ...
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1answer
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Does exercise affect the number of muscle cells?

Washington.edu reported that: Muscle cell number is affected by exercise level while young and elitefitness.com said: a trainee in the early stages of training would increase cell number ...
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Could people perceive the color blue in ancient times?

This article claims that no ancient language anywhere in the world had the word for "blue", that for instance Homer described the sea as "wine-dark", and that the color blue has only appeared more ...
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Does the human body crave missing vitamins?

My mother has told me that if your body needs a certain vitamin, you will find you feel like eating fruits that include that vitamin. For example, if you have lack of Vitamin C, you'll get a craving ...
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Does frequent sex cause vaginas to become permanently stretched?

This is a common belief, sometimes used to shame women - that virgins have 'tight' vaginas and women who partake in more sexual intercourse have 'loose' vaginas due to permanent stretching. Is this ...
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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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