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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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neural genes expressed in nasopharyngeal specimens

Is it possible in a nasopharyngeal specimen genes of neural system to be expressed? For example, genes about neural differentiation?
marilu's user avatar
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0 votes
1 answer
948 views

What is the significance of running an uncut plasmid on electrophoresis gel?

What is the significance of running an uncut plasmid on electrophoresis gel? In this case we are talking about inserting a gene into plasmid, which then goes under PCR and then electrophoresis.
Bari's user avatar
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4 votes
1 answer
204 views

What stops myosin during muscle relaxation?

I understand that when the muscle is relaxed tropomyosin blocks myosin binding sites on actin filaments thereby preventing muscle contraction. What I am concerned with however, is whether myosin ...
Positron12's user avatar
1 vote
0 answers
827 views

What property of water explains how sweating helps the runner continue running?

My question I have to answer is: A runner picks up pace on a warm day and starts sweating profusely. What property of water explains how sweating helps the runner continue running? The following are ...
Renée's user avatar
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0 answers
39 views

Has the human capacity to heal from burns evolved due to actual burns throughout human history?

I just burned myself while cooking, and it occurs to me that although this has happened countless times, my skin always heals itself rather well after burns. In this post I make various assumptions/...
Fiksdal's user avatar
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15 votes
1 answer
3k views

Why do diseases in the tap water of developing countries affect people from developed countries more?

My siblings and I went abroad to a country that doesn't have drinkable tap water, but we did not know this at the time as the people who lived there used to drink it all the time with no issues. One ...
James's user avatar
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-1 votes
1 answer
81 views

Why is the food we consume right from birth not immunogenic to elicit an immune response? [closed]

Excluding the hypersensitive reactions which are individual specific, how is food we consume considered safe by the immune system?
Sucharita Chatterjee's user avatar
2 votes
0 answers
62 views

What is the function of human Trypsin Inhibitor if trypsin is secreted in the inactive form of Trypsinogen? [closed]

I was reading about pancreatic digestive enzymes in a Textbook of Medical Physiology and I came across Trypsin Inhibitor. The text stated that: It is important that the proteolytic enzymes of the ...
Mrinal Gautam's user avatar
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1 answer
91 views

Can we apply NGS (next generation sequencing) on DNA extracted from formalin fixed paraffin embedded tissues (FFPE)?

I'm working on the microbiome and I can only use tissues which are fixed with formalin and embedded in paraffin. Is it possible to apply NGS (next generation sequencing) on FFPE (formalin fixed ...
Noor Elhouda's user avatar
0 votes
3 answers
283 views

If due to some reasons a small portion of our neurons die, how does our body remake them?

There are various reasons such as intake of neurotoxins, and possibly traumatic injuries, that can cause neurons to die. After several hundreds, or thousands of our neurons die, how does our body ...
Fghj's user avatar
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0 votes
1 answer
63 views

Can a human survive without ACE2?

I guess not, but it was discovered in 2000 so I don't know if we know enough about it. Are there people without ACE2 (angiotensin converting enzyme 2)? It seems mice can survive, but that's not a ...
jinawee's user avatar
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2 votes
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Does The Sympathetic Nervous System Increase or Decrease Urination?

According to my book: Sympathetic nervous system stimulation, leads to the release of Norepinephrine(Noradrenaline), priming the body for the "Fight or Flight" response. It is also stated ...
Positron12's user avatar
2 votes
1 answer
1k views

Why does exhaled air still contain oxygen?

If the partial pressure of oxygen in the atmosphere is 159 mmHg and that inside human alveoli is 104 mmHg, and if these values are fixed or don't change very much, then why does exhaled air have ...
Arun Bhardwaj's user avatar
0 votes
1 answer
701 views

What is the difference between a myofibril and a myoblast? (In skeletal muscle)

I read that a muscle fibre (myofiber) is formed when myoblasts fuse. https://teaching.ncl.ac.uk/bms/wiki/index.php/Skeletal_muscle#:~:text=The%20multinucleate%20feature%20is%20established%20in%...
Jane's user avatar
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2 votes
1 answer
118 views

What is the difference between a dermatome and a sensory neurone?

I read that a dermatome is an area of skin supplied by a single spinal nerve but that this is sensory information? Why do spinal nerves supply the skin? I thought it was the other way round- sensory ...
Jane's user avatar
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4 votes
1 answer
174 views

Do adult mammalian cochlear inner hair cells regenerate?

The consensus seems to be no, but I see conflicting evidence. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5361427/ Supernumerary human hair cells—signs of regeneration or impaired development? A ...
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1 vote
0 answers
30 views

What is the process of aging exactly? [closed]

Getting old Hello community, I have been thinking about age, and I thought that aging is the reverse of how a biological system is able to fix itself over time. Actually, some species actually are ...
0x0584's user avatar
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4 votes
1 answer
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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,...
user73910's user avatar
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1 vote
0 answers
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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 ...
Priyanuj Bora's user avatar
0 votes
2 answers
94 views

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 ...
Dani's user avatar
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1 vote
1 answer
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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-...
EverQuestioning2010's user avatar
-1 votes
1 answer
51 views

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 ...
sirzento's user avatar
  • 101
-3 votes
1 answer
149 views

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?
Kashmiri's user avatar
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-1 votes
1 answer
117 views

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 ...
user19840's user avatar
3 votes
1 answer
428 views

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 ...
Bipasha's user avatar
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0 votes
0 answers
126 views

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 ...
Paichu's user avatar
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2 votes
0 answers
33 views

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 ...
Colin Collins's user avatar
-1 votes
1 answer
93 views

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 ...
Probably's user avatar
  • 2,438
2 votes
0 answers
173 views

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 ...
Meerkat's user avatar
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1 vote
1 answer
172 views

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 ...
ANA negative's user avatar
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0 answers
59 views

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 ...
Ally's user avatar
  • 329
2 votes
2 answers
1k views

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, ...
hb20007's user avatar
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1 vote
1 answer
150 views

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 ...
BCLC's user avatar
  • 85
2 votes
1 answer
305 views

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 ...
mye's user avatar
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-3 votes
2 answers
104 views

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 ...
Almas's user avatar
  • 105
3 votes
2 answers
1k views

Can the axial length of the human eye decrease?

I understand that the axial length of the eyeball grows until you are around 20 years of age, which is why hypermetropia decreases with age but myopia doesn't. My question is: can the axial length of ...
James's user avatar
  • 578
0 votes
0 answers
36 views

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/...
Kis Elemental's user avatar
-1 votes
1 answer
278 views

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 ...
Kishan's user avatar
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0 votes
0 answers
28 views

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. ...
Captain Trojan's user avatar
0 votes
0 answers
17 views

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
Octavylon's user avatar
0 votes
1 answer
187 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 ...
liv beckley's user avatar
7 votes
1 answer
358 views

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 ...
Epiousios's user avatar
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2 votes
0 answers
56 views

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 ...
Jose Brox's user avatar
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1 vote
1 answer
29 views

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 ...
Robiul Hoque's user avatar
0 votes
0 answers
32 views

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 ...
Jay Dee's user avatar
0 votes
0 answers
443 views

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 ...
anrieff's user avatar
  • 101
1 vote
2 answers
103 views

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 ...
adlibber's user avatar
  • 285
0 votes
1 answer
174 views

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 ...
user avatar
-1 votes
1 answer
244 views

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?
Pratham Hullamballi's user avatar
0 votes
1 answer
214 views

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? ...
user11937382's user avatar

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