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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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Can diet, supplementation and/or drugs affect sexual dimorphism?

After puberty, can certain diets, exercise, and/or possible drugs affect masculine/feminine dimorphism in adults? We know dimorphism and/or morphology is a product of genes, but to what extent can ...
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1answer
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Does applying a sedative via hypodermic needle anywhere in the body really work?

Bad Guy is fighting the Good Guy. Good guy miraculously produces a syringe and rams it into the Bad Guy's neck. Cut, From my middle school biology I aware that capillaries are present ...
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How would a human wearing earth clothes die on mars? [duplicate]

Please answer immediately If a astronaut out of her spaceship onto mars without her spacesuit, but just wearing her earth clothes, would she die first from suffocation, boiling fluids, freezing, or ...
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What is meant with “the chest wall and lungs are coupled together”?

Since the lung and chest are elastic, we can represent them with springs. Under normal conditions, they are coupled together: the “lung” springs are stretched and the “chest” springs are compressed. ...
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How the modern science/ research help address issues related to haemoglobin [on hold]

Can you please help me with questions 7 as it’s a homework due on Monday I need to get the answer before Monday (https://i.stack.imgur.com/PdlgN.jpg)
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Are humans the only primates being engaged in group sex?

There are quite many examples of humans being involved in group sex. I won't say it is a common thing and won't say whether it is "natural" or "cultural" (but "cultural" only means induced to majority ...
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1answer
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Are the chemical constituents of human bodily fluids similar to sea water?

I have heard a comparison of human bodily fluids to sea water from various sources in the past. The most notable was a teacher who claimed, if I remember correctly, embryonic fluid is comparable in ...
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1answer
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What is the reason behind that sometimes when I see new thing I feel that I have already seen them?

I have googled it and I found that it is, because of good memory, but how it can be due to good memory as it didn't happen before. It happened to me many times, that I feel that the scene which is ...
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If the body continuously produces new sperm, how is there room for it?

If you never ejaculated, how is there room for the constantly generated new sperm? I mean, is there always room for more?
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Do we know how dangerous six-eyed sand spiders are?

The Sicariidae family contains the well-known and dangerous Loxosceles spp. (fiddle-backs, violin spiders). The family's other two genera, Sicarius and Hexophthalma (six-eyed sand spiders) have ...
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Barr body. How does it work? [duplicate]

Barr's body is a spiral X chromosome. If I'm not mistaken, one random chromosome (a healthy woman) is inactivated in each cell. Which X chromosome is inactivated in a given cell is random. I've heard ...
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Can facial bones move under prolonged stress?

I heard that facial bones keep changing more unlike other bones in the body. If so, do face bones change/adjust to pressure? For example, palate expanders apparently can widen the maxilla bone through ...
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Why is a nose injury more painful then injury to other body parts? [on hold]

I am a MSC student, and I am studying zoology during my studies about noses. My question: Why does receiving an injury to some part of our body other than our nose feel less painful than when being ...
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Why a baby vomiting smell changes when he got sick in absence of someone?

I observe that my cousin got sick when her father went to Dubai. She is only 9 month. She starts vomiting from that day but her vomiting smell is very different from the normal ones vomiting. why is ...
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Is Race Really a Social Construct? [duplicate]

It is a well known fact that eugenics before it was done away with tippy toed around the pseudo-science abyss. Yet, the hidden rule to only seek to prove how similar humans are seems to me as a way to ...
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1answer
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Do all animal cells have lysosomes?

I know that white blood cells have lysosomes but what about other body cells? I mean, any other cell such as cells in the respiratory system.
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2answers
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How do we know that mild forms of rabies are nonexistent?

Wikipedia's rabies article says: "Death usually occurs 2 to 10 days after first symptoms. Survival is almost unknown once symptoms have presented, even with the administration of proper and intensive ...
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Why do dogs get cysts at a young age (couple years), but humans rarely and at a much much older age?

Now, there is an assumption on my question. That my observation is correct and people aren't running around hiding their cysts and/or getting them treated--that people DO get cysts much less often ...
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1answer
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Will our biological bodies be changed after we’ve occupied and settled Mars? [closed]

I had this question in mind for very long time, and I could not find a clear answer on the Internet, so I was hoping that you might know the answer. If we will bring life to planet Mars and a few ...
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1answer
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Why doesn't our immune system react to infused antibodies produced in a horse?

Calmette tried injecting horses with snake venom and then taking out the serum which has produced antibodies against the venom and injecting in the snake-bitten human. Shouldn't our immune system ...
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1answer
102 views

Is it possible for a fire to start inside of a live human body? [closed]

Over the years, I've read about spontaneous combustion in the news, but now I am wondering if it's possible.
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1answer
38 views

Is it possible to grow brain tissue in vitro? Can we make a super-brain this way? [closed]

I wonder whether such experiments were conducted? Is it possible to create a "biological super-computer" this way?
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1answer
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How does vasodilation slow blood flow?

During inflammation, cytokines and histamine cause vasodilation to increase blood flow to the inflamed area. However, it is also said that vasodilation slows blood flow which facilitates the adhesion ...
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2answers
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Does eating beans of a mother cause flatulence on babies?

Is it true that if you eat beans it could cause flatulence on babies (when breastfeeding them)? I can't find any research or scientific facts about that topic. I thought the body of the mother would ...
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0answers
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What does the concept of information mean in biology? [closed]

We use a lot of borrowed analogies from other sciences; linguistics, computational sciences but what do we really mean, mean with information in living systems?
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1answer
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Are modern gene-editing techniques capable of creating genetically-superior versions of humans? [closed]

Can we alter the DNA in, say, a small-framed, low muscle mass male to those of elite bodybuilders? Can we alter the DNA sequence that stops balding and hair loss? How about the genes responsible for ...
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How are we able to selectively inflate our cheeks?

First an observation - I noticed that I can not inflate my cheeks with my mouth open. This means that inflating cheeks is not a muscle property and that only pressure of air from lungs trapped inside ...
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1answer
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Why is free ribose not reduced to deoxyribose rather than the reduction occuring on ribonucleotides

I cannot understand why deoxyribonucleotides are not synthesized directly from deoxyribose, but ribonucleotides have to be synthesized first, and only then can deoxyribonucleotides be synthesized.
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1answer
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How do you write genotypic and phenotypic ratios?

If two homozygous recessive parents are crossed, I know that all of the offspring will be homozygous recessive as well. Would you write the genotypic ratio as 0:0:4 then and the phenotypic as 0:4? (...
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Why green light is good for our health? [closed]

I have a knowledge that when you woke up and see green light it increases your sight power. How it does so?
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3answers
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Can a cancerous cell from outside cause cancer in a healthy person?

If a cancerous cell enters the body of a healthy person from someone else's blood or something, will that healthy person get cancer? In human beings.
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1answer
34 views

Can some colours be processed faster/more accurately than others?

Is the human visual / motor system able to track, and move in response to, objects of certain colours more quickly and reliably than for others? By more reliably, I mean with greater accuracy in ...
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1answer
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why finger of hands and feet become wrinkled due to to water? [duplicate]

Mostly due to bathing or washing clothes our finger become wrinkled what was the reason behind it??
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Rod and cone photoreceptors are neurons?

i mean the photoreceptors have axon and dendrite and body cell or it is not neuron any more . can we say outer segment of photoreceptor cell is dendrite ? of course these have body cells but i am ...
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0answers
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Why do I feel nauseous at the sight of blood, despite not being afraid of it?

Every time I ask google this question, all it spits at me is info on blood phobias ^-^; basically, I've always been hugely interested in morbid stuff, but I noticed that I always feel sick when ...
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1answer
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Does the deletion of Chromosome 20 cause immunity against prion disease?

I was reading recently about prion disease and it caught my attention that a normal prion protein is coded n chromosome 20, therefore, in order for an infectious prion protein to attack, there must be ...
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How “unique” human vagina is?

Regading penis Dixson showed that it is not really unique and complex. This argument (and there were some others) was used against the idea of human polygynandry. But what about vaginal shape? I know ...
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1answer
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Why doesn't it feel suffocating when taking a shower? [closed]

When one walks into a bathroom where someone is (or just finished) taking a shower it is hard to breathe, because it's filled with steam, yet the person taking a shower can breathe just fine despite ...
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difference between animal and plant durring organogenesis

i would like to ask about organogenesis of animals and the relationship with plant as we depends on it. me i do not understand why we are totally different with the plant but all of our body made ...
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What is 'brainfreeze' and what are its cautions and how to leaa down its risks?

How we will exactly ellaborate the concept of brainfreeze in accordance to brain functions, how is it caused and how we can less its risks?
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2answers
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quadrupedalism in human [closed]

Recently I saw a BBC documentary on a family from a remote village in turkey where one couple has 18 children and out of which 5 are walking on four legs. These children are 28-34 yr old & have ...
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3answers
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Why is the mechanism of inheritance for this disease autosomal dominant?

An unrelated couple has a daughter and a son with the same rare condition. Neither parent has any obvious signs of the condition, but the father's mother (paternal grandmother) and her brother have ...
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1answer
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Red neurons - Acute neuronal injury

“Red neurons” are evident by about 12 to 24 hours after an irreversible hypoxic/ ischemic insult. The morphologic features consist of shrinkage of the cell body, pyknosis of the nucleus, disappearance ...
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2answers
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Tissue fluid water potential

just a quick question. Is the tissue fluid the same water potential as the cells it surrounds? I am a bit confused because if it was lower it would cause water to leave the cell and if it was higher ...
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0answers
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Water loss through the skin

I just have a quick question. Do humans lose water through the skin because of the water potential difference between the inside of the cell and the outside of the cell? Shouldn't water leave the cell ...
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1answer
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Blood pressure in the blood vessels

Why do the capillaries have a lower blood pressure than the arteries even though the capillaries lumen is much narrower. Wouldn't the narrowness of the blood vessel increase the pressure? Also the ...
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1answer
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White blood cells after dealing with an infection

I just have a quick question. If there was an infection of a tissue within the body, white blood cells would leave the capillaries around the tissue and enter the tissues to help cure the infection. ...
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1answer
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Red Blood Cell Size Vs White Blood Cell Size

I have just found out that white blood cells are larger than red blood cells and now I'm confused due to something I learnt in class. Basically, I was taught that there were spaces between the ...
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1answer
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Blood Vessels (Artery Vs Arterioles)

I just have a quick question regarding what my textbook says. I have tried searching online but I have failed to find an answer. Basically, my textbook states that arterioles are smaller in diameter ...
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1answer
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Do you have nerves on the outside of your skull? [closed]

I have a spot on my skull that feels like a nerve or blood vessel. I know that there are many to the brain, however, it is the only one I have ever felt. So do we have nerves or blood vessels on the ...