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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If you are physically tired and you lie down, will the blood rush to the brain?

I always hear something like this from my parents, usually after travelling. They say that I should not lie down because I am tired and blood may rush to the brain. While I find this quite plausible, ...
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Can small amounts of exercise build muscle?

I have run across a number of exercise routines which claim individuals can lose weight and build muscle with very little exercise. So, the question: Can an average person become ripped in three ...
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Is foot pronation a predictor for injury? Can it be corrected with shoes?

Retailers of running shoes talk about "pronation" and the risks it causes and how shoe choice can help. For examples, Asics claim: Pronation refers to the way your foot rolls inward for ...
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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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Did Haribo sugar-free gummy bears cause a man to lose bowel control in a Toronto airport in April 2013?

So, I recently saw a Youtube video (warning: potentially NSFW; contains a graphic description of gastrointestinal distress and the loss of bowel control) that reads aloud the text of an Amazon review ...
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Does this medical study prove that wearing gold is harmful? [closed]

So I have this article that was sent to me by a friend of mine and it pertains to a ruling in the Quran (that declares that silk and gold are forbidden for men to wear). So the article claims that ...
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Are there people who can't get high on marijuana?

I smoked my head off and can't feel anything. And my friends can get high just by breathing all the smoke in the room :) Someone told me that I need to try more and get used to it, and it will happen ...
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Can you get your legs stuck around a pole, leading to cramping and then death?

I came across this video that makes a series of claims based around a position that a person can apparently get stuck in around a pole, and unintentionally kill themselves: Hot girl tied to tree with ...
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Does bathing in chlorinated water ruin your tan?

Does bathing in swimming-pools (e.g., at hotels or water parks), where chlorine is added to the water, brighten your skin? I've heard from many different people that bathing in pools with chlorine ...
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Does the heart pump blood through arteries? [closed]

The conventional model of the circulatory system assumes the heart pumps blood out of the ventricles through a series of progressively branching arteries of decreasing diameter transitioning to ...
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Can mattresses relieve scoliosis pain?

I found a lot of reviews of mattresses that claim they can help with back pain from scoliosis. I was really surprised because I haven't heard about them before. Here are some examples: ...
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Did the Chinese chairman Xi Jinping carry 100 kg of wheat and walk 5 km of mountain road without switching shoulders?

In the first episode Liang Jia He (Chinese: 梁家河篇) of the series Chairman Xi's Beginning (Chinese: 習總書記的初心), Xi said (in Mandarin Chinese) 因爲我那時候,抗 200 斤麥子,十里山路不換肩的 ... because I, at that time, ...
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Does wearing summer clothing during the winter increase your tolerance to the cold?

My dad could tolerate long periods of time outside during the winter while wearing shorts and a t-shirt. He told me he started wearing warmer-weather clothing during the winter, and eventually his ...
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Do people carry around up to 20 lbs (9 kg) of poop?

The claim from this site: It’s been said that the average American carries around between 5-20 extra pounds of poop in their intestines. It's hard to believe it's true. Is there a medical evidence ...
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Does slapping parts of your body increase blood flow and help with physical activity?

I have believed for quite some time that slapping limbs is "good for blood circulation", without ever looking more into it. After getting curious about it, I found a lot of claims that it's ...
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Does synthetic vitamin C contribute to the formation of genotoxins that can lead to cancer?

While researching Vitamin C supplements, I noticed dozens of people outraged about various companies slipping in "synthetic vitamin c" (ascorbic acid). From what I can tell this aversion ...
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Do dramatic cases of body shaking and trembling in religious settings have supernatural causes? [closed]

There are many examples of people experiencing dramatic body shaking and trembling in religious settings, such as the ones below: Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 ...
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Are blue light filters, not blue lights, on phones and computer screens harmful to sleep?

These existing questions ask whether the blue lights, not blue light filters, from computer screens affect sleep: Does blue light from screens (phone, computer, TV) before sleep affect sleep? Does ...
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Did David Blaine hold his breath for 17 minutes?

David Blaine (born David Blaine White; April 4, 1973) is an American magician, illusionist and endurance artist. He is best known for his high-profile feats of endurance, and has made his name as a ...
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Can the human body significantly build muscle while losing body fat?

The fitness community often says that you can't slim down and build muscle at the same time. The reason for this is said to be that the body is in a “catabolic state” with calorie deficit. In order to ...
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Does every species get around a billion heartbeats on average?

I read this webcomic today: From: abominable.cc I have no idea where the author got his factoid about the billion heartbeats. But it sounds interesting. The examples I can think of (rabbits, humans,...
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Are women physically weaker?

I've always thought that "women are weaker1 than men in general" was a biological fact (supposedly stemming/evolving from the social structure of prehistoric humans) Is there any reputable ...
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Does hugging a romantic partner for 20 seconds cause an Oxytocin spike?

So I've been seeing a claim around a lot lately in various articles and "amazing fact" lists. Positive Psychology News is one example: after only 20 seconds of hugging a romantic partner, one can ...
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Can trained humans run faster than all other animals on a marathon distance?

During the athletics world championship, a commentator mentioned casually during the marathon discipline that humans are faster over long distances than all animals. I'm unsure if this can be said ...
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Did The Lancet publish an account of a woman who did not age?

Mary Baker Eddy, the founder of the Christian Science religion, claimed in Science and Health with Key to the Scriptures*, Ch. 8, p. 245:1-15: The error of thinking that we are growing old, and the ...
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Does it take two weeks for a single man to produce enough sperm to impregnate every fertile woman on Earth?

Fact Slides has a slide that claims: A single human male produces enough sperm in two weeks to impregnate every fertile woman on the planet. It sources a book of random facts Is it true?
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Static contraction training: is working out for 25 seconds once a month enough to build muscle?

According to conventional wisdom, in order to get results in a timely manner, one should train multiple days a week lifting weights for several sets of 1–5 reps for strength and 6–12 reps for ...
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Does your hair grow faster when you're sick?

A friend told me that when you're sick, your hair grows faster. When I started asking a lot of questions, my friend said it's a known fact but she doesn't remember where she heard it first or what was ...
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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 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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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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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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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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Near death experiences -- clinically dead person "sees" something, later verified to be true?

Related: Is there any explanation for a near-death experience? That question is about vague, light-in-the-tunnel near death experiences (NDEs). This question is about very specific claims I've heard ...
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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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Can a lightbulb once inserted into your mouth be safely removed?

There is a viral video going around that repeats a claim I've heard before about getting a light bulb stuck in your mouth Graphic reads, The bulb shape allows it to be put into the mouth, but ...
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Is it possible to cause a skin burn by telling a hypnotized subject they are touching a hot object?

I've read somewhere long ago that the following suggestibility experiment was performed: The experimenter asks the subject to hold their palm open, then tells them: "I'm going to put a very hot ...
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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 milk make your bones stronger?

It's a common notion that milk makes bones stronger; milk contains calcium and bones contain calcium. But obviously it's not the case that calcium ingested is immediately deposited into bones. In fact,...
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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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Are men more attracted to women who are ovulating over those who are not?

Background In 2016, a Business Insider article by Rebecca Harrington asserted that there have been multiple studies supporting the notion that men are preferentially attracted to women who are ...
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Does eating nonsalty food with MSG make you thirsty?

Assume that you're thirsty after eating food that didn't taste salty while you were eating it. I know that MSG contains sodium. Quora posts and https://msgdish.com/msg-problems-and-answers/ still ...
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Does handling your food release digestive juices and enzymes that enhances the meal?

In a Google Arts & Culture article, Yẹ́misí Aríbisálà, "Nigerian essayist, writer and food memoirist", states the following: There are scientific claims that fingers have powerful nerve ...
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Does nail-biting indicate iron deficiency?

I've seen on a lot of websites that nail-biting behaviour is due to lack of iron in the blood. I'm wondering if is this actually true, or just an urban myth which has spread and spread?
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Are physically attractive people more likely to be right wing politically?

The Guardian recently reported this: It is a finding unlikely to prove popular with Guardian readers, but a study has concluded that attractive people are more likely to be rightwing. The study ...
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Does salt (or sodium) not make you thirsty?

This is from a Toronto MS thesis: High dietary sodium intake is hypothesized to increase food intake (FI), fluid intake and glycemic response. Two short-term randomized repeated-measures studies ...
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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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Is the comeback of measles in the US "largely due to anti-vaxers?"

From CNN: In some recent years, there have been fewer than 100 cases nationwide. But the [measles] virus has made a comeback in other years, including 2019 -- largely due to anti-vaxers, experts ...
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Does UA Rush bodywear improve athletic performance?

Under Armor is selling a products made from a new fabric called Rush. During performance, the body emits heat. The responsive UA RUSH fabric absorbs that heat and converts it into infrared energy ...
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Is Texas, a relatively warm state, one of the leading states in hypothermia deaths?

This April 11, 2019 article on National Geographic about lost hikers and survival rates states (emphasis added): In Herrington’s wilderness survival courses, he teaches day hikers to pack a puffy ...

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