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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16 views

The relation between muscle stiffness and physiological tetanus

Is there any relation between these two concepts (1) : Tetanic contractions in skeletal muscles (2) : Muscle stiffness If there is , I would hope if you provide a reference which includes any ...
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Can Future Shock Really Kill? [closed]

A trope I keep running into while researching various things like Artificial Intelligence is the concept of "Future Shock." Essentially, a person from the sufficiently distant past (or a ...
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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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Can the brain alter how our genes expressed? [closed]

I have been wondering something , in theory , if there was a way to infulence the brain / subconsious mind to alter genes, expression , would it be able to? There is a biologist, bruce litpon that ...
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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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Auditory distance perception

How do humans detect the distance of sound? For example if my phone is ringing in the other room how do I know that it's in the other room and not beside me? I am planning on developing a software to ...
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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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34 views

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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What is the relation between “classes” (stem cell, proliferative and differentiating) and the types (Ad, Ap, B) of the spermatogonium?

Describing the question in the title further, The section, Systems Toxicologic Pathology, Dianne M. Creasy, Robert E. Chapin, in Haschek and Rousseaux's Handbook of Toxicologic Pathology (Third ...
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When is it viable to remove old graves?

Societal considerations aside, when all the remaining relatives of a particular gravesite have all disappeared or forgotten about a certain grave, is it viable/hygienic to remove or repurpose old ...
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What fraction of human cells gets infected during a viral infection?

As I understand, if a cell gets infected during a viral infection then it eventually dies. If an individual does not die of an infection, the percentage of cells that gets infected in the course of ...
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Do pinhole glasses help reduce eye strain?

I've noticed that I can read about 10x longer at screens and books without my eyes tiring using the "pinhole trick" - where you curl your fingers and look through the hole (great explanation here ...
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Why does insertion of transmembrane domains occur in the rough ER?

To elaborate on that question, why in the secretory pathway does the insertion of transmembrane domains into the membrane occur in the rough ER as the protein is translated and threaded across the ER ...
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Is it possible to lose more than gain more fluids by sweating due to drinking very hot water?

It's an extremely hot day today (about 40 degrees celsius) and I made myself a hot cup of tea, when I drank it I sweated profusely and wondered if it's possible I lost more fluids by sweating than I ...
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Do L cone cells have a secondary peak?

I found some pictures on the internet suggesting that L cone cells (an in some M type too) have a secondary peak in the blue part of the spectrum. Is that so? Why would that be? (As if there is not ...
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What are different stages of living in abnormal pressure?

On the top of the Earth's highest mountains the pressure is too low for a human to breathe without oxygen mask. This is because the partial pressure of oxygen becomes so low that breath can't fill ...
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Why do viruses cause different symptoms?

If the sole purpose of a virus is to hijack the nucleus of a cell to replicate, why do we have different symptoms for different viruses? I can think of the following comming into play: immune ...
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How it will taste if one puts two substances on tongue simultaneously?

If we put two substances having different taste on tongue simultaneously how it will taste? Does specific part of tongue is sensitive to specific taste?
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Is it possible to make synthetic olfactory receptors?

Are there any electronic engineering technologies that allow people to make synthetic olfactory receptor that generate electrical impulses when exposed to certain proteins or molecules? If not, what ...
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Does the brain absorb heme and non-heme iron differently?

I know that for the brain to absorb iron, the iron must first pass through the blood brain barrier. Is this absorption different for heme and nonheme iron?
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How does lactic acid cause muscle twitching?

It is well-known that lactic acid buildup (often caused by workouts) causes muscle twitching. Does anyone know HOW lactic acid achieves that effect?
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What is the cause of a protuberant belly in kwashiorkor?

Kwashiorkor is a PEM characterised usually by a pot belly. Of course, the obvious question, why is there a pot belly in the case of a malnutrition? I had been searching the cause of this for a while ...
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Unlike humans, why do plants not have something blood-like to transport $O_2$ throughout their body?

Since plants have a large number of stomata at different parts of their body, they can get $O_2$ at almost every part of the plant and so, they don't need to transport it throughout the whole body ...
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If heparin is an anticoagulant, how is its effect nullified upon exposure to air?

First of all, does heparin always remain in circulation? Or is it specifically released by the mast cells and basophils upon activation? Adding to that, if it always stays in circulation, why is its ...
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What is the lowest pressure differential for which an air embolism as been observed?

Scuba divers can suffer air embolism if they ascent too quickly. If I understand correctly one of the involved factor is the difference between deepest water pressure the divers was in and the lowest ...
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Does non-alcoholic beer have a hydrating or dehydrating effect on humans?

It is my understanding that alcoholic beer, and alcohol in general, has a dehydrating effect on humans. Does non-alcoholic beer have a hydrating or dehydrating effect on humans?
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Aging: Only humans have grey hair?

I am not sure if I ever saw a monkey or a bird age and lose hair pigment as it grows. It maybe due to my lack of information. But it appears to be a general presumption that only humans age and lose ...
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Is this trial that reversed aging in humans worth taking seriously?

In September 2019 Fahy et al. published results from the TRIIM (Thymus Regeneration, Immunorestoration, and Insulin Mitigation) trial. Their stated goals were to investigate whether they could restore ...
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Why do scientists perform most of biological experiments done on rats prior to humans? [closed]

Why do scientists perform most of biological experiments done on rats prior to humans? Scientist gave a third ear to this rat Source Here is the another source claiming Researchers wants ...
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Does a tubular sodium reabsorption cause a stimulation of β2-adrenergic receptors?

I read the study "The Role of Aldosterone in Obesity-Related Hypertension" and there is one thing I didn't understand. They write: "According to norepinephrine-induced tubular sodium reabsorption, ...
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Which results in greater energy expenditure: consecutive actions, or non-consecutive actions?

Is there a difference in energy expenditure when performing the same set of movements consecutively vs non-consecutively? Example: You jump in-place 1 time, stand motionless for 1 minute, and then ...

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