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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22 views

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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Would a human who received a fecal transplant from a horse donor be able to digest hay? [duplicate]

If a human received a fecal transplant from a horse donor (or other hindgut fermenting monogastric herbivore) would they be able to digest hay (or other cellulose rich plant life)?
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Why is it considered weird to talk while inhaling?

I have tried to do many types of research on this but there's no clear or reliable sources. When ever I ask if someone can do it it is only a few words; and then when I start to hold an entire ...
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Is a “Nerve” a cell or a tissue? [closed]

Nervous tissue includes Neurons and Glial cells. Neurons have soma and other projections (neurites) namely Axon and Dendrites. Axon or dendrites of a nerve cell covered with endoneurium is called ...
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Preterm pregnancy and “putting it back in”

It is possible for men to give birth. Why is it impossible for a preterm or not yet viable fetus to be re inserted?
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Does anybody have an references to share or idea onhow the tumor behaviour changes as it grows from oligometastasis to polymetastasis?

I have looked at the literature and mostly scientist discuss about how a metastatic lesion is formed. But what I am interested to learn is how does a new metastatic lesion develop when there is ...
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Why do we have to move in the cold for higher chance of survival?

To survive in the cold temperatures, a person should move as much as possible so that they do not freeze to death. But constantly moving also leads to the body becoming more and more exhausted. Why ...
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Looking to understand the difference between (Fibroblast Growth Factor) FGF-2 and FGF-5

Non-biologist nor medically trained person here, but still nonetheless interested in the functioning of the human body, and more specifically, hair growth cycles. I've read in several sources that FGF-...
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Can you eat more calories than the body can store?

I believe I have read that if the body takes in too many certain nutrients/vitamins, the body simply excretes them. How does this behave with calories? If I have a daily consumption of exactly 2,000 ...
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Why do humans need pillow to sleep better? [closed]

As far as I know, no animal sleeps with a pillow/support under their heads. Why then do we need to keep a pillow?
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Is it true that recanalisation of the vas deferens, if any, tends to happen soon after a vasectomy (less than 1 year), and if so, why?

https://doi.org/10.1016/s0140-6736(00)02436-3 "How reliable is a vasectomy? Long-term follow-up of vasectomised men": Most episodes of recanalisation are believed to happen soon after ...
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Mammary gland development and lactation

I was reading on mammary gland development, and I found this (1): As a girl approaches her teen years, the first visible signs of breast development begin. When the ovaries start to produce and ...
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Is there an animal venom to which humans are naturally resistant?

Some species, no matter how poisonous or venomous, have natural predators that can withstand the poison/venom. Does human also have something similar? This question came to me after I spent an hour ...
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Constitutive Dark Skin vs Facultative Tanned Skin

Most can easily spot the difference between a tanned and dark person. But from my research, the only difference is in the size and concentration of melanin (Jablonski). But this continues to increase ...
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Staphylococcus (antibacterial soaps and Traditional Lathering soaps)

I have been working on a biology research assignment regarding the claim: Antibacterial soaps are superior to traditional lathering soaps in minimizing the transmission of disease I have made a ...
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Functions of the layers that make up Bruch's Membrane

I have a question regarding Bruch's Membrane. Within Bruch's Membrane there are the following layers: Outer Basal Lamina Outer Collagenous Zone Elastic Zone Inner Collagenous Zone Inner Basal Lamina ...
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EM field in living organisms and tissue resonance frequency

I have two questions which I can't find enough information about, and I would be very grateful if someone could give me a lid to the answer: As far as I know, if we accelerate charged particle it ...
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What kind of people are more likely to catch COVID-19?

It is well known that people of old age or with respiratory problems are more vulnerable by the effects of COVID-19. However, I wasn't able to find information on any similar trends on catching the ...
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Why is thoracic breathing dominant in women while abdominal breathing is dominant in men?

In human males, lateral movement of thorax constitutes 25% of breathing while abdominal movement accounts for 75% of breathing. It is exactly the opposite in the case of women. I got this piece of ...
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1answer
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Partial pressures of different gas in human blood and how they are calculated?

In Respiratory Physiology, we use the $P_x{O_2}$ and $P_x{CO_2}$ in blood at different regions of the peripheral circulation. From my Chemistry knowledge I know that $P_x$ of a gas in a solution is ...
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Na+ / K+ ATPase: How does it restore resting membrane potential? [duplicate]

Could not find any sources talking about this (in a clear manner). If the Na+ / K+ ATPase pumps 3 Na+ out for every 2 K+ it pumps in, thus making the cell more negative, why is the Na+ / K+ ATPase ...
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What are the physiological effects of retinal exposure to 380–400nm light?

There are two categories of sunglasses: UV380 sunglasses block all light with wavelength 380nm or lower, while UV400 sunglasses block all light with wavelength 400nm or lower. This made me wonder, ...
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1answer
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Monozygotic vs Dizygotic heteropaternal superfecundation

Update: I had a wrong assumption. After triple checking, I now see that how ordinary monozygotic twins arise is 1 sperm and 1 ovum and then later the zygote splits up. (1.1. and that that phil and ...
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1answer
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is there a limit to how much humans can taste?

kind of a weird question, sorry, but i was wondering--is there a threshold at which our taste buds become overwhelmed? if i, say, put some supersweet compound in my mouth, would there be a point at ...
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Can we develop a virus which is amicable for us but deadly for SARS-CoV-2 and HIV?

I am not biologist and do not have special education in it etc. It is know that in the wild, some species have their deadly enemies. What I am suggesting is can we humans find/create virus that is ...
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1answer
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Can the human eye axial length decrease?

I just have a quick question regarding the axial length of the eyeball. I understand that the axial length of the eyeball grows up until your around 20 years of age which is why hypermetropia ...
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If calcium ions and cholesterols are found on the surface of the skin, would it be possible for Vitamin D to be synthesised on the skin?

Calcium ions are abundantly found in the extracellular space of the stratum corneum area, the top most layer of the skin (Skin Barrier and Calcium; https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5929942/...
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Why do doctors reccommend vegetable oils in high cholesterol and cardiovascular disease?

As there is high cholesterol in body why the patient need more fats and why the doctors are recommending it Transcribed: Vegetable oils are rich in polyunsaturated fatty acids (PUFA). The fatty acids ...
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Under which conditions is human energy consumption minimized?

Including but not limited to: body state consumed food composition state of the digestive tract diseases wounds sleep coma, etc.; death excluded environment state temperature light pressure, etc. ...
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closed circulatory system and blood supply to the heart endocardium

Human has closed circulatory system. in this type of circulation of blood, the vessels are not directly contacted with the cells and feed the cells by extracellular fluid. Now, how does the blood flow ...
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Why does exposure to a smell for some time reduce the electrical response of receptor neurons in the olfactory system?

In what way does exposure to a certain smell for some time causes them to loose sensitivity and have a lesser electrical response
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Can twins that develop in separate sacs but share the same placenta be identical?

I have two younger non identical twin sisters. When my mum was pregnant she was told they were both in different sacs when developing but shared the same placenta. We have done hours of research on ...
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Is faster breathing during exercise linearly more efficient?

Evolution's an amazing thing. It has this incredible ability to optimize variables, and often these optima can then be learned by people to gain insight into various biological phenomena. In exercise, ...
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Why is there no herd immunity against common cold coronaviruses?

In discussions of herd immunity against SARS-CoV-2 the underlying assumption usually appears to be that the virus basically stops spreading once a sufficient percentage of the population has overcome ...
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Exhalation in human breath, through mouth or nose: which is most usual?

Until now I believed that breath exhalation through the mouth is common for most human beings, and this fact is implicit in several technical contexts of which I can think (sports, music, medical ...
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question regarding indirect ELISA

what are the plausible reasons as to why the HRPO-conjugated donkey anti-human immunoglobulin and the chromogen/substrate were added from the right to the left of the microtiter plate?
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Can the basement membrane of blood capillaries expand?

I have been doing some rudimentary research into the basement membrane and found the it contains collagen fibers which are known for their elasticity. Does this mean that the basement membrane can ...
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SNP Genotyping Scanning technology

The silicon bead micro-array technology for SNP scanning is a marvellous example of human ingenuity. Is anyone aware of a non-technical history of its development accessible to the lay reader? As an ...
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Why are the sympathetic and parasympathetic axons different, in terms of presynaptic and postsynaptic length?

Does the parasympathetic system have a long presynaptic efferent axon because it takes a great distance to reach target organs from the brain stem or sacral region of the spine? Does the sympathetic ...
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Is there an antidote for caffeine, e.g. as a supplicant for caffeine-intolerant persons?

First, let me state I'm not talking about a medical emergency. No one is in a serious condition. My girlfriend is, we think, caffeine-intolerant. She loves the smell of coffee and the habit of coffee ...
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Why is there a distinction between an *allergic* and an *immune* response?

Our immune system has evolved to protect us against potentially dangerous non-self particles. I have difficulty in understanding why there is a distinction called an allergic response: what’s wrong ...
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Can the shoulder bones grow after the growth plates have fused?

Body builders have broad shoulders. If one start lifting weights after one's growth plates have fused, can one still increase the width of one's shoulders? If yes, does that mean shoulder bones can ...
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If Melatonin is anti-gonadal, why is it associated with early sexual maturity in congenitally blind girls?

If melatonin is anti-gonadal, that is, it delays sexual maturity, then shouldn’t it delay sexual maturity in congenitally blind girls rather than helping them attain sexual maturity at an early age?
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Does the human eye’s field of view shrink when focusing on far away objects?

It seems like the lenses of the eye is like a fisheye lens that flattens out to a normal lens when looking at far away objects. Does that also mean that the field of view gets narrowed down as well? ...
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When did humans or their ancestors gain the instinct to take shelter?

I was going to ask if seeking shelter in a constructure dwelling or natural formation was instinctive to modern humans or if it is a learned sociatal behaviour. By shelter I mean seek routine ...
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How does the energy we get from food transform into mechanical motion at the cellular level?

I am curious how, when we consume food which is broken down into glucose, powers the movement of the associated proteins in the muscle for example? Is the thermal energy converted to kinetic energy ...
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Why is cognitive maturity related to organism lifespan in larger animals and mammals?

I am not a student of biology, so I should provide some context to me asking this rudimentary question. While doing a graduate-level course on Reinforcement Learning, the instructors focused on how we ...
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Why does hypocalcaemia cause increased muscle contraction?

Calcium is needed for muscle contraction, so how does hypocalcaemia cause increased sustained contraction?
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Why are the retina layers arranged the way they are? [duplicate]

The retina layers are arranged in such a way that light has to pass through several layers before hitting the photosensitive cells. Won't this be much better if the photosensitive cells made up the ...
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What is the meaning of the word “Ligandable” in “ligandable proteome”?

I see "ligandable proteome", "ligandable proteins" and "ligandable targets" an awful lot. But really I don't know what exactly the word "ligandable" means? Is that it means, for example, "ligandable ...

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