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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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What is the importance of histidine in the buffering action?

What is the importance of histidine in the buffering action in animals?
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Is there any evidence that Vitamin K-2 megadoses increase bicondylar, bizygomatic or bitemporal breadth in humans?

Can megadosing or supraphysiological dosing of Vitamin K2 (MK4; Menatetrenone) over prolonged periods of time cause an adult's bicondylar breadth, bizygomatic breadth or bitemporal breadth to grow ...
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Does the brain have a clock and can it be sped up?

Before i start, I'm an engineer and have very limited knowledge on biology and neuroscience. My question is, does the brain have a clock like a computer where it has a set processing speed? Clocks in ...
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do platelets cytoplasm contains DNA?

I'm a 12th-grade student and I have an entrance exam this year. I have a question in biology. I would appreciate you if you help me <3 as we thoroughly know platelets are multiple pieces of a big ...
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Why is there a layer of moist lining the inner walls of alveoli?

I'm taught that the walls of the alveoli are moist, so gaseous oxygen molecules can dissolve into this water. This then allows the dissolved oxygen (liquid state) to diffuse faster from the alveoli ...
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Does low gravity exposure to early stages of human fetus have potential to unloc unused genetic information from earlier stages of evolution?

The title seems quite self explanatory but let me elaborate. New mutations do take a very long time and many generations to occure in the genetic code. But our genetic code already holds all the ...
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Colour of our organs

Upon researching the organs of the body I have found that in every picture that I have seen the organs are of colour for example the kidneys are a light red colour. I understnad that our organs are ...
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What are the proportions of average human arms, legs and torso to each other that the population tends towards?

Normally when I draw or model something, I have a reference image. However, I want to draft a human-like creature for which there is no reference image, so I have to build it from scratch. For some ...
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Is male cosmetic surgery a viable mating strategy for choosy females?

Is a man in modern times "competing" with other men based on genetics for reproductive success? If so, would male cosmetic surgery of any degree be viable as a modern attempt at competing for female ...
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Why does sympathetic activity constrict pulmonary vessels?

I don't know understand why sympathetic stimulation constricts pulmonary vessels? I thought that the sympathetic nervous system activated the body for physical activity. Physical activity would need ...
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What does ubiquitination between 2 genes mean?

I have come across the Hedgehog signaling pathway. In this pathway, the genes Cul3 and ptc have an interaction of ubiquitination (The information is available from the KGML file). What does this ...
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Histology cheek swab

I recently did a cheek swab and I can recognize the cells the nucleus and cell membrane, but I noticed a section that had a cluster of nuclei resembling dots. I was wondering if it was just cells ...
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1answer
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Is the lac operon repressed in the presence of both glucose and lactose?

In the presence of both sugars (glucose and lactose) will there be repression of the lac operon completely? I know that more glucose means less cAMP --> less CAP --> less positive regulation, and ...
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Do fat people have more chances of developing nitrogen bends?

I was reading some text on deep sea physiology. I got to know that solubility of nitrogen in fat is five times that in water. The exact text from the book animal physiology adaptation and environment ...
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How can a child be blood type AB, if both of the parents are blood type A?

Basically, both of my parents are blood type A (both are confirmed and it's also certain both of them are my biological parents). I recently found out my blood type is AB. How is this possible? I ...
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What is the max amount of photons per second of the rods and cones in our eyes?

The title says it all. I just cannot find any information about this - I have tried for so long now. Therefore, I figured that I could reach out to some clever guys in this forum for help instead:) ...
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Why silver hair is starting to come in black [duplicate]

I am 68 years old and have been happily silver haired since my late 50s. What I'm noticing lately is that a lot of new hair that's coming in is either black or very dark brown (my original hair color.)...
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1answer
43 views

What are the effects of oxygen toxicity in human blood?

I was reading some text on deep sea Physiology, and for to know that diving to do could cause oxygen toxicity in the blood. This was the exact text from the book Textbook of Medical Physiology by ...
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How does common cold START?

When I searched for the causes of common cold, I found out that it's only cause is the spreading of virus and that it's a myth that you get cold when you get wet. If that is true then how does the ...
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1answer
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Can endemic diseases be acute?

Diseases can be classified as :endemic ,or pandemic,...etc. An endemic disease is an infectious disease which is generally or constantly found among people in a particular area. Disease conditions ...
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Do all commercial ionizers produce harmful ozone?

I'm not a scientist. I have read that negative ions have health benefits. I am interested in increasing the ratio of negative to positive ions in the air in my home. I see that ionizer machines exist ...
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1answer
35 views

We know that the hepatitis C virus can live on surfaces for at least six weeks. Maybe longer. The infectivity study ended after just six weeks; why?

Background A paper has found that the hepatitis C virus (HCV) can remain infective for at least six weeks on ordinary household surfaces. You can see the free full text, or a summary for busy ...
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A study found that the hepatitis C virus can live on surfaces for six weeks. Did they end the study before the seventh week began?

A study once found that the hepatitis C virus (HCV) can remain infective for six weeks on ordinary household surfaces. You can see the free full text, or a summary for busy clinicians. What happened ...
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1answer
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Why proximal muscle weakness is seen earlier than distal muscle weakness in Dermatomyositis?

It is said that in dermatomyositis(DM) , proximal muscle weakness is seen earlier than distal muscle weakness. It is also said that , DM is due to damage to small blood vessels contributing to muscle ...
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1answer
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Effects of horizontal vs. vertical motion on human body

I want to know if moving along a vertical plane in a circle differs in its effects on the human body from moving horizontally in a circle. Imagine a ferris wheel with a diameter of 50 metres. If a ...
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1answer
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Height prediction based on genetics

My height, as predicted by my genetics, is 156 cm whereas my actual height is 172 cm. What could be the reasons for this substantial discrepancy? Does it just mean I had very good nutrition as a child?...
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When the present state of knowledge concerning central noradrenergic transmission was established?

Some time ago I began to search for descriptions of the mechanisms responsible for the regulation of noradrenergic transmission in the central nervous system of man and to my great surprise the most ...
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1answer
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Osmotic Pressure Clarification

My textbook states that the higher concentration of solutes, the greater the osmotic pressure will be and the greater the pull of water in will be. However, osmotic pressure is defined "as the ...
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1answer
37 views

When muscles contract is the process similar to how non-newtonian fluids react?

I'm trying to understand how muscles contraction/tension works but getting loss in on the cellular level. From my understanding, when muscle tissue need to contract, the cells are flooded with calcium?...
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1answer
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What type of movement is “spontaneous movement” if it isnt reflex movement and it isnt purposive movement?

According to Spontaneous and induced fetal activity Spontaneous motor activity of the foetus depends significantly ot the foetal age; during the period between the 12th and 16th week it was ...
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1answer
19 views

can magnesium bicarbonate be absorbed in the mouth?

Can Magnesium Bicarbonate be absorbed in the mouth?" Magnesium Bicarbonate occurs naturally in some mineral waters.
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1answer
48 views

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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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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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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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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1answer
49 views

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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1answer
37 views

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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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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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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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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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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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
50 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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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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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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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 ...