Questions tagged [human-biology]

This tag is for questions about the general biological features of human beings (as opposed to the biology of non-humans).

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how the steep osmotic gradient inside medulla is maintained even the blood osmolarity changes?

I am a high school student and I am a little confused in 2 things related to our excretory system: 1)we know in our kidneys a countercurrent mechanism exists due to which there is a steep gradient of ...
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25 views

Do people need nitrogen from air for health?

Can people breath totally nitrogen-free atmosphere for a long time? I know, nitrogen is essential for life, and in big quantities, but maybe people can take it entirely from food, from proteins, etc?
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If massive animals live longer, why do humans with gigantism die younger?

What I mean is humans suffering from gigantism (type 1 neurofibromatosis, Marfan syndrome, X-linked dominant acro-gigantism, et cetera) rarely live more than 5 decades (50 years). The same can be said ...
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If a person touched an electric eel, would they sustain electrical burns as if they touched a high tension power line?

I've been wondering this, if an eel was continuously shocking someone, would they sustain electrical burns as if they touched a high tension power line due to the high voltage and amps?
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Is covid vaccine helpful for a covid patient?

I am not a biology student and this question came in my mind out of nowhere. I read somewhere that the vaccines contain some denatured or almost dead corona viruses and when these are injected in our ...
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Best book to read to understand human Genetics for a beginner?

I'm just a person who's interested in human genetics, genetic diseases and the human genome. I have some idea of genetics and humanity as a whole but it is not my profession. Just a hope
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Merzenichs' experiment suggesting neuroplasticity

Nicholas carr says in his book 'The Shallows' : Merzenich proceeds to the second stage of his experiment. Using a scalpel, he makes incisions in the hands of the animals, severing the sensory nerve. ...
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Are Pond Algae Edible for Humans?

I've been farming freshwater fishes. After some time, i found some green algae grows there. When the algae dried, it looks like nori (which commonly used for sushi wrapping). So, i wonder if those ...
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Why is gyrification advantageous?

Standard 'Explanation': I've seen countless neuroscience articles and experts explain that 'cortical gyrification is advantageous because it increases surface area which obviously increases your ...
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What exactly makes red meat (probably) unhealthy?

It seems generally agreed that (even fresh, unprocessed) red meat is at least somewhat bad for human health. But why exactly is this the case? It's difficult to find any attempt at an explanation, ...
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What are some health conditions that are not exacerbated by stress? [closed]

So a lot of conditions that are neurological or are associated with inflammation have the potential to be made worse or triggered by stress. Sometimes it might be due to affecting the ability for ...
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Does loss of dopaminergic neurons totally eliminate voluntary muscular control?

Breathing is a function that is not only autonomic, but can also be temporarily overridden and placed under voluntary control. In fact, you are now breathing manually. Now, suppose that someone has ...
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What type of epithelium are the pancreatic Islets of Langerhans?

The human pancreas contains exocrine acinus cells (simple cuboidal epithelium) and Islets of Langerhans. Despite looking online I cannot identify what type of epithelium the Islets of Langerhans ...
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Effects of a constant magnetic field on the human body (especially blood circulation and ion channels)? [duplicate]

Recently, while searching for the safety of MRI, I read in several places that hemoglobin and iron in the blood are not significantly affected by magnetic fields, so MRI is safe. However, since the ...
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Do phagocytes need antibodies to be able to engulf pathogens (to function)?

I recently saw a question about monoclonal antibodies, that are specific to a certain virus, being split (into their constant and variable regions via an enzyme), and the question asked whether some ...
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Why is haemophilia unviable in later stages of life?

A sentence in my textbook is: The possibility of female being haemophilic is extremely rare because mother of such a female has to be at least carrier and the father should be haemophilic (unviable ...
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Confusing Research about virus survival on surfaces

I am a medical practitioner.. I cant clear peoples confusion, and even I am confused now...would anybody please help me to come out of this confusion.... Can virus survive in dried blood? This is one ...
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Quantitative comparison of rate of energy output when burning carbs compared to fat

I'm studying scientific models of endurance exercise such as the one in a paper by Rapoport (see references below, popularization here). If I'm understanding properly, fat burning is in some sense ...
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109 views

Pressure measurement blood flow

During blood pressure measurement, when the flow within the arteries of the arm is interrupted, how is blood flow redistributed to the rest of the circulatory system? Is it possible that more blood ...
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Difference between plasma and serum? [closed]

I came across this sentence in a paper: It has also been shown in human patients that plasma VEGF-A levels were more strongly correlated with BMI and waist circumference than serum VEGF-C Setting ...
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How could prehistoric humans survive without trimming their hair? [closed]

It is known that human hair, especially the hair on the head, can grow very long. This hinders the vision and seems to become a disadvantage to humans, especially when they are hunting. I saw this ...
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Does any tendon in humans receive a high amount of blood supply? Or is the property of not receiving a large blood supply a constant across tendons?

I read on https://www.physiocomestoyou.co.uk/blog/all-you-need-to-know-about-tendons/ (mirror): [Tendons] do not have a large blood supply. Does any tendon in the human body receive a high amount of ...
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7k views

Breathing becomes harder in certain wind conditions

I'm not sure if this is the right site to ask this, but it seemed like the best option. I've observed on myself that, if I stand on a train platform and a cargo train drives by, creating strong, ...
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Why do we get bored of certain food items after repeatedly eating them?

Why do many people not like certain food items after eating them for long? They seem tasty first, and after eating many times, it feels like we get bored.
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Why does the Vas Deferens detour over the pubic bone?

I was surprised to learn that the vas deferens detours over the pubic bone instead of taking the obviously more direct path. https://human.biodigital.com/widget?be=u1P&uaid=1ly5V Because I would ...
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I hit an area of my elbow and had a burning sensation throughout my hand

I happened to bump the side of my right-hand elbow on a corner and suddenly felt a burning sensation on the right side of the hand elbow-up. Any theories that could describe what I recite?
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Are human bodies programmed to die?

Following from this question: What is the evolutionary advantage of death?: Is there any evidence that human bodies have systemic self-destruction built into their developmental program? I'm not ...
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Is protein intake required for the formation of new myosatellite cells?

Hypertrophy of muscle fibers requires an adequate (significant, really) intake of protein, but what about just forming new myosatellite cells as a response to a stress applied to the muscle? Does that ...
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502 views

Difference between pulse and blood pressure

I'm a very naive and biologically illiterate person, and from what I've read on the internet I'm not really sure I understand the difference between pulse and ...
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Check simple human fetus answers

Based on this image and questions, could someone please check my answers? Question 1: At which one of the following points will the blood passing the point be more oxygenated after birth than before ...
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1answer
490 views

Why are all human beings not black in color?

Archaeologists and historians strongly claim human beings originated from the African continent, where the default color is black for humans. Why are all human beings not black in color?
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Does drinking dry water have same effect as drinking regular water?

Dry water consists of water droplets that have been coated with silica nanoparticles, which prevents the droplets from forming a liquid. If a human swallows dry water, does it have the same effect as ...
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949 views

What are the coverings of femoral hernia?

It was my Viva question and I was really puzzled.I know what is femoral hernia and it route like the abdominal content moves down the femoral canal and further through the saphenous opening and all ...
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Are there epigenetic effects in the regulation of human height?

Development of human average height Human average height has fluctuated significantly throughout history. For instance, in the last 100 years or so, it has increased sharply by about 10cm. OWID (Our ...
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How many times have the cells in a human body divided?

Every single cell in a multicellular organism can in principle trace its "ancestry" back to the zygote through a continuous chain of cell divisions. How many divisions have occurred in a typical cell ...
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The Relationship between Copper and Alzheimer's Disease

I've been reading up about the research concerning the etiological factors behind Alzheimer's and I came across two papers - "Studies on Copper induced stability changes in DNA fragment (GCA ATC ...
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Can we decode memories?

Premise: I don't have a strong background in neuroscience or human biology, so I would ask you to answer like you would at a 5 years old child. I have done a couple of research on the web, as well as ...
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41 views

How many cells need to be damaged before a human can feel it as pain?

I'm guessing the answer to this question is rather large. Skin cells die all the time, it seems, and that never registers as painful. But suppose you rupture or otherwise destroy a group of cells, say ...
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9k views

How can alcohol cause blindness?

Strong alcoholic beverages (e.g. moonshine) are reported to have caused blindness amongst some people. How exactly can alcohol make someone go blind? Is that because different forms of "rubbing" ...
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Is there any biological reason for humans to rest after x days of work?

A lot of people live in a 7 day cycle, where 5 days of work are followed by 2 days of "rest". Vacations and holidays can increase the time available for resting. Is there any biological reason for ...
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Why does the thickness of the Loop of Henle have to be less than the convoluted proximal tube and the distal convoluted tube?

We are currently being taught "Homeostasis through excretory system" in college. After seeing the structure of a nephron, it is not quite evident as to why should the Loop of Henle be the ...
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How does the shoulder joint stay in place?

I read that a human shoulder is a ball and socket joint, but when looking at a picture of a shoulder the socket part seemed way too small to hold the ball in place like a ball and socket joint. ...
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How do organophosphates affect kidney function?

Many organophosphates, besides inhibiting acetylcholinesterase, can also permanently inhibit the enzyme neuropathy target esterase, leading to nerve damage. NTE also happens to be found in the kidneys,...
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If you only ate fruits, vegetables or smoothies would you be able to skip drinking water?

If you only ate fruits, vegetables or smoothies would you be able to skip drinking water? I do not see some animals (like squirrels) drinking water daily (doesn't mean they don't have a water source) ...
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Which landmark paper first described the differentiation of T-cells?

T-cells are distinguished from B cells in part by their locus of differentiation/maturation (thymus). This is textbook knowledge, but I was wondering which particular person or people were responsible ...
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Why does high blood pressure not damage the body during exercise?

Exercise is commonly understood to lower blood pressure by making the heart stronger. Mayo Clinic says, Regular physical activity makes your heart stronger. A stronger heart can pump more blood with ...
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Are there any benefits/disadvantages/traits from having a permanent lower core temperature?

My body temperature as far as I remember has always been around 35.6 degrees Celsius, that's a degree less than what is the usually quoted as the average temperature for humans. Are there any known ...
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Why do men grow facial hair?

Ancestral facial hair. Our closest ancestors, the chimpanzee and bonobo, both grow facial hair around the mouth area. What is noteworthy is that this is the case in both males and females of the ...
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592 views

What tests can be performed to test the purity and quality of the raw peptide HCG (Human Chorionic Gonadotropin)

What tests could be run to test the purity and type of HCG? We are looking to purchase HCG from China but the purity and quality varies between labs, we are able to receive samples of the raw peptide ...
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Is there any disease in common between human and insects?

I am not asking about disease transferred by insects. I am wondering is there any disease that commonly make both human and insects sick?

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