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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-2
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0answers
33 views

Dominant species? [closed]

I was studying evolution and discussing biology with my roommates and we ended up talking about species and humans. This is more of a biological and evolutional question, there a superior or dominant ...
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Increasing Eumelanin Production In Body

Is there any way on how to increase the eumelanin production in your body for a longer period of time without improving pheomelanin? Thanks for your answers.
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17 views

Immunology: Best way to detect autoantibodies in patient? [closed]

If one is to detect auto-antibodies cross-reactivity in a patient, would it be best to use a series of antigens derived from human or other animal sources? I was thinking that humans and mouse for ...
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19 views

Parthenogenesis vs. Fertilization. Is a polar body different from an egg?

In Parthenogenesis that happens by automixis "the replication of an egg by meiosis and the transformation of the haploid egg to a diploid cell occur by fusion with a polar body." =https://www....
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75 views

Janina kolkiewicz who faced Lazarus phenomenon

I've just read about Janina kolkiewicz case who faced Lazarus phenomenon and I was wondering how could her brain and organs survive these long hours without oxygen?
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Do gingers smell stronger than other humans?

Various sources state that RedHeads smell different from other people. Has it been scientifically demonstrated and reasoned?
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1answer
5k views

What is the human energy consumption by organ?

The human brain uses about 25% of the human body's metabolic energy. How are the other 75% spent, in terms of portioning to its various systems? I thought this could be answered by a simple search, ...
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1answer
27 views

Do umbilical cholinergic neurons allow communication between mother and fetus?

Presumably, since cholinergic neurons are invovled in memory, there must be some capacity to transmit memory or information to the fetus.
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28 views

Can an embryo who had some embryonic stem cells removed grow normally?

According to this (It's in Spanish, I couldnt find other reference) Stem cells Stem cells come from embryos who has between 3 to 5 days , and who contains around 150 cells. These stem cells are ...
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38 views

Did death evolve to reduce inbreeding [duplicate]

This.seems like the only reason death would happen. People die so they are unable to keep adding their genes to the gene pool and create homozygosity.
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18 views

Can a single spermatozoon break through the zona pellucida?

Can a single spermatozoon digest 15μm of zona pellucida with its 1μm acrossome? It doesn't seem possible yet one of my biology teachers told me that it was. Are multiple acrossomes needed to get ...
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27 views

What is the chemical makeup of dna polymerase [closed]

what is the chemical makeup of dna polyemerase in terms of chemical compounds and elements? Are the elements the same ones found in humans?
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1answer
49 views

How to design a permanent vaccine to cholera using CRISPR?

I know that Vibrio Cholerae infects the body through the GM1 ganglioside. So, would it be possible to engineer a CRISPR gene editing tool to prevent Vibrio Cholerae from getting into our cells? ...
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38 views

Changes in dna from dioxin poisoning

A person sprayed with a dioxin, how long would it take for a dna change? Instant or over time? Would that person having children afterwards pass on any(if any) dna changes?
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19 views

Causes of iron loss without bleeding [closed]

What would cause a human to lose iron from your hemoglobin without the loss of blood? How is it possible?
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1answer
67 views

How does coffee cause calcium loss in our body?

Recently on radio a doctor advices to reduce the consumption of coffee as it leads to calcium loss(as my mother described). My initial response was: How could such thing be possible? What kind of ...
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27 views

Biological & Evolutionary Reasons for Palm (Bi)Symmetry

The fingers of the human palm exhibit a (bi)symmetrical pattern with regards to their size, in the sense that the thumb and the pinky are almost the same size, and the same holds for the index and ...
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1answer
54 views

Why are HeLa tumors purple?

I remember hearing that the tumor where HeLa cells originated from was purple and jelly like, and I've seen pictures from studies with rats and HeLa tumors, and their tumors appear to also be purple. ...
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23 views

Membrane proteins

Please could someone help me figure out which of the below 2 statements is correct: 1) Glycophorin A has both N and O linked glycans. 2) The ABO antigens are made up of glycoproteins. This was ...
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12 views

Does food grade diatomaceous earth contain mercury

Not sure if this is the right site to ask this question, but since diatomes are or once were biological creatures it seemed to fit this one more than any of the others. I have been supplementing my ...
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2answers
60 views

Why, when someone eats food, and he/she directly checks his body weight, why it seems to be no changes in body weight?

Why, when someone eats food, and he/she directly checks his body weight on balance, why it seems to be no changes in body weight and there wasn't any execration, I want to know where did food weight ...
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11 views

Would DMSO Be An Effective Solvent For Creating A Transdermal Absorption of NMN + Pterostilbene + TMG In Humans?

I've read conflicting information on this. If not DMSO, is there a better solvent to use?
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1answer
41 views

What are cells not affected by hormones called?

Cells that are affected by hormones are called target cells which have their own receptors that listen to signals. I'm unsure of the actual name of cells that are not affected by hormones, I tried ...
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19 views

Do people have local immunity?

I mean the immunity that covers only one body part or skin area after exposure to the infection but does not cover the whole organism.
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47 views

Can two proteins activate/inhibit the same gene at the same time?

Suppose there are two proteins inhibiting a particular gene. Its not necessary that both will inhibit the gene at the same time instance right? So if one protein has already inhibited that gene before ...
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1answer
32 views

Does Japan have an ageing population? [closed]

I often hear Japan has a declining/ageing population. It seems to be the prime example for this kind of thought. Yet after moving to Japan and after having been there for travel several times already. ...
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2answers
73 views

Why do red muscle fibres have more mitochondria than white muscle fibre but less ATP than White muscle fibres?

This is a question given in my Anatomy book and I am really confused because logically the substance which have more mitochondria should have more ATP as mitochondria is the power house of cell.But ...
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1answer
58 views

Can a young voice have physical causes?

I have noticed that some older adults (40+ range) can have voices that sound much younger than their actual age (i.e. an adult sounds like an adolescent). My question is: could any physical aspects ...
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27 views

Brain evolution in the age of the caesarian

I have just been reading an account of the evolution of human intelligence in Matthew Syed’s recent book on diversity, called “Rebel Minds”. He is not the originator of this idea, but he suggests ...
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1answer
32 views

In human embryology, what starts ovum cell division?

Maybe I am not using the correct search keywords in Google, but I cannot seem to find anything beyond basic information taught in schools about fertilisation of the egg by the sperm. After the sperm ...
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20 views

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 ...
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11 views

How are antiandrogens broken down in the body?

Does anyone know how the body breaks down anti-androgens? I'm trying to figure out how this works. I tried to look some of it up on google but couldn't find any understandable resources.
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1answer
95 views

Is sexual desire stronger in men than women?

Usually in popular culture it's considered men sexual desire is stronger than women. This seems to be congruent with the availability of sexual related items for men and women, such as magazines, ...
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1answer
50 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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1answer
74 views

Why do we need to amplify DNA sequences?

I am learning about biotechnology. I have no education in biology or chemistry and am simply interested in the subject of biotechnology. I am wondering why we need to have multiple copies of a piece ...
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1answer
116 views

Sleep deprivation relation to growth rate and mental health in adolescence

Do sleep deprivation and its timing affect growth rate and mental health in adolescents? If so how much sleep is enough for teenagers?
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1answer
45 views

Why males are more prone to cardiovascular diseases such as heart attacks than females?

I often see more people of males undergoing treatment for heart disease. It is often said that female reproductive hormone (oestrogen) has some cardio-protective action by preventing constriction of ...
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1answer
52 views

What happens if an enzyme stops working in the body?

For example, if the enzymes in the digestive system stop working will the digestion still occur as enzymes are only catalysts for the reactions. Thank You
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1answer
36 views

By what mechanism do our nerves lengthen as people get taller?

How do nerves get longer as kids grow taller? I searched for an answer but I can only find information on the formation of nerves in embryos.
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18 views

Do cells of the same type fuse together with suturing?

I am reading this site: http://sciencenetlinks.com/student-teacher-sheets/cells-your-body/ "Cells that do the same job combine together to form body tissue, such as muscle, skin, or bone tissue." ...
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11 views

When do the chordae tendenae stop developing?

I am guessing they stop during either fetal or adolescent development. Then gradually break down and age. No growth after adolescence.
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19 views

How much DNA can differ among different humans today?

According to this article, Australian aborigines carry unknown DNA Australian Aboriginal people carry the DNA of an unknown human relative. This made me wonder, is it known how much DNA can differ ...
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3answers
76 views

Are there any proteins not found in the brain that are affected by prions?

A prion is an abnormally folded protein that is capable of causing otherwise normal proteins to also misfold and become prions. They are responsible for causing diseases such as Kuru and Creutzfeldt–...
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47 views

Human femur maximum strength

In this video https://www.youtube.com/watch?v=os98s9kBlOI it is demonstrated that a moose leg bone can support until nearly 10 tonne before break. Is there any similar demonstration on human femurs? ...
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17 views

Nutrition and experimental biology

We know that food in the stomach is present in the form of chyme treated with pepsin and hydrochloric acid, if we take food crush it with saliva and then treat it with Pepsin and HCl (in the lab),and ...
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8 views

Is atrial natriuretic peptide relased when we drink water?

I know that osmolarity is controlled by the hypothalamus and recover by ADH which reabsorb water. It also can be released when ECV is very low. ECV/salt is controlled by aldosterone/atrial ...
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2answers
101 views

Why isn't life expectancy normally distributed?

Lots of phenomenon in nature can be plotted onto some sort of normal distribution, and that makes intuitive sense to me (such as human height). Why then, does global human life expectancy drop off so ...
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1answer
62 views

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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35 views

Does intelligence depend more on environment than on genetic factors? [duplicate]

Many have argued that the test of IQ is simply a test of language. The application of the test consists of asking a number of questions. The person should understand the question presented to them and ...
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35 views

How much Oxygen can the Human body carry?

Basically - the title: How much Oxygen does a human body carry at a single point? What have I tried: A friend of mine has done some calculations and came up with the following numbers. Neither of us ...