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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Does exercising increase the rate at which UV rays are absorbed and cause affects?

Does exercising while in sunlight affect the rate at which the human body absorbs and reacts to UV rays? As sunburn is the secretion of fluids, increased dilation of blood vessels and inflammation of ...
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1answer
101 views

Is intelligence (or mental ability) genetically transferred (inherited characteristic) from the parent to the offspring or is it an acquired trait?

The question is simple- whether our mental ability i.e. ability to acquire and store knowledge and comprehend and analyse the stored bits, an inherited trait (i.e. genetically transmitted from the ...
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65 views

Are lines (wrinkles) on the human forehead skin related to science of (often worried) thinking?

It is the common observation that when we tend to think about anything, most often, we tend to make the conformation of raising the skin of forehead; from my observation this is the most common ...
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1answer
43 views

Why does mud therapy work by some pain related diseases?

Apparently, some users here agree there is no ion exchange through the skin. Mud therapy has some therapeutic effect for pain related diseases. As an anecdotal example, I experienced pain relief by ...
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1answer
45 views

How can rapid growth cancer get nutrients in vivo?

When I was little, before I get into biological studying, I read a news talking about cancer would be totally cured after decades. I still remember that researchers had a theory to claim if they could ...
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3answers
4k views

How could humans have interbred with Neanderthals if we're a different species?

To be clear, I'm not doubting that homo sapiens and homo neanderthalensis did interbreed: of that much I'm convinced. Within the past few years I've seen an upcropping of pop-sci articles discussing ...
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2answers
220 views

What makes diffculty to make a human bio-tooth compare to a mouse's? [closed]

Some time ago I read a news article that said a bio-engineered tooth based on a mouse's would be available around 2015. There was some research about it at King's College in the UK, and many other ...
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49 views

Rampant low Vitamin D

Why have people inadequate vitamin D status? Is it just (the lack of) sun exposure, or is it related to hormone and thyroid function?
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1answer
28 views

ATP to disassembly of nucleotide ratio

DNA Helicase, the enzyme that is responsible for tearing apart the strands before DNA replication, requires ATP to rip apart nucleotides. I have asked this question to several professors and they ...
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1answer
59 views

Are progenies factually half-clones of the parents?

Given that a "clone" (if anything, in the context of human cloning) is taken to be, as far as I have understood, a specimen possessing the same genome as his "father/mother", aren't all "non-cloned" ...
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1answer
68 views

Is it possible for a person to eat so many carrots that one turns orange?

I once read that Jerry Rubin (a famous 1960s activist) ate so many carrots that he turned orange. (This was in the East Bay Express, around twenty years ago.) I assumed it could be true, though he ...
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2answers
634 views

Is it possible to stop yourself from going into shock?

https://en.wikipedia.org/wiki/Shock_(circulatory) I was helping someone move a refrigerator down steps and it slipped while I was holding a sharp corner and it sliced my finger and there was ...
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1answer
302 views

Why don't we have two hearts? [duplicate]

The human body is amazing. But there seems to be some evolutionary changes that appear to not make sense regarding redundancy. While not necessarily the primary reason for their existence, the human ...
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1answer
594 views

How heavy are all foreign microorganisms in and on the human body?

I define "foreign microorganism" as a microorganism which is not produced by the human body (not antibodies or leukocytes) including bacteria, viruses, fungi, biofilm aggregates or small lifeforms ...
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2answers
68 views

Can we change one's genome into the genome of somebody else

If I (grown-up individual and not just an egg after fertilization) wanted your exact genome, would we be able with today's technology to change my genome into yours?
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Growth of Yeast in Different pH Mediums

Will yeast grow better in acidic, basic or neutral mediums? Why? Will the medium affect the growth of yeast? (Yeast cell membrane is semi-permeable).
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21 views

Electrically facilitated active transport across a membrane

I'm trying to go back to school to do a PhD in control theory, specifically concerned with control of glucose. The glucose system can be controlled using two chemicals: insulin and glucagon. I was ...
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1answer
23 views

Corneal transplant and HLA matching

Is HLA matching/ blood grouping required for corneal transplants ? I think,it shouldn't be, because cornea is avascular. I tried searching on the net but most of the references are old and ...
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1answer
103 views

Does dairy negatively affect the voice for singing?

Singers and actors are warned not to consume dairy, primarily milk, before a performance. From personal experience, I know that this is a very valid warning. It is commonly assumed that this is due to ...
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2answers
143 views

Are oxygen and carbon dioxide simultaneously present in red blood cells during gas exchange?

From my understanding, the process that displaces the carbon dioxide and oxygen in our erythrocytes and lungs is diffusion. I've been taught that diffusion is the net movement of particles from a ...
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1answer
46 views

How many diseases can be linked to disruption in the microbiome of a human?

I was listing to the radio and heard recent research found a link between children and higher cases of asthma when certain bacteria are missing from the microbiome. How many other diseases can be ...
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1answer
2k views

Can females be recreated from male DNA?

A chromosomal male is XY and a chromosomal female is XX. Now imagine if, one day, this world has only males - is it possible to "recreate" a female by using two X chromosomes from two different males?
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2answers
219 views

Does melanin protect humans from gamma radiation?

It is known that radiotrophic fungi use melanin to make use of gamma radiation. It is also known that melanin protects human skin from UV radiation. Thus I wonder whether melanin protects humans from ...
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1answer
685 views

What is the point of a runny nose during a cold?

What is the biological purpose of having a runny nose during a cold? Note, this is a different question than "What causes a runny nose" and other similar questions. Those question are about the cause,...
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0answers
41 views

Birth control hormones in the water? Or not?

This prior question talks about natural estrogen (TL;DR: Months to years): How quickly do estrogens break down in the environment? Ref: http://dx.doi.org/10.1038/485441a A lot of media has said, "...
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2answers
1k views

What is the function of E-coli bacteria in our stomach?

So, I recently came up with this question. I googled it, but couldn't understand the proper functions of E-coli bacteria. A little definition would be wonderful.
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2answers
250 views

Are there nerves in the umbilical cord?

I have always imagined that cutting the umbilical cord after birth might be painful. But I have always been confused about who would feel the pain and why. It occurred to me that the mother or the ...
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1answer
119 views

Is there a genetic reason explaining the difference of the height of male and female?

The male and female height difference seems to be around 1.08 if all cultures are counted from these stats: https://en.wikipedia.org/wiki/Human_height Can this ratio, 27/25, be explained by genetics ...
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3answers
957 views

Do we consume dna, proteins of other organisms?

When we eat raw meat, e.g. chicken or fish, we are actually consuming the DNA, proteins etc. which are present in their cells. Wouldn't this affect our cell functions as this DNA might enter our ...
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3answers
719 views

What is the biological significance of finding palindromes in DNA sequence?

I found a function called palindromes in Matlab that finds palindromes from DNA sequence. Now what is the biological intention behind incorporating this function? What the biological significance of ...
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0answers
48 views

How does intron retention make the alternative transcript non-coding?

I faced with a non-coding transcript that specified as one the isoform of BIN1. It sounds that this isoform generated as a result of alternative splicing with a intron retained; am I right? However, ...
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3answers
623 views

Do spinal cord reflexes (such as the knee-jerk reflex) continue to function under general anaesthesia?

The knee-jerk reflex (patellar reflex) is an example of a stretch reflex (myotatic reflex). Stretch reflexes are monosynaptic reflexes happening in the spinal cord without involvement of the brain. ...
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1answer
81 views

Is blood pressure in the aorta and brachial artery the same or different?

Does the blood pressure at the root of aorta equal the blood pressure in the brachial artery? I've heard it does, but it doesn't quite seem to make sense as I'd think the blood pressure would be ...
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2answers
194 views

Does the human body convert water?

I just read Andy Weir's "The Martian" (which was very good) and one line made me wonder: [...] a human body only borrows water. Is that true? Does all water "that goes in, go out"?
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83 views

Do all mammals have a Ventricular system?

I am familiar with the human Ventricular system that circulates Cerebrospinal fluid. This is needed among other reasons, to suspend the heavy human brain, and for injury protection. Do all mammals ...
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1answer
47 views

Genetics of epilepsy

Is epilepsy genetically inheritable? If yes, is it dominant?
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1answer
504 views

If a human is stranded with beer but no water, should they drink it? [duplicate]

TL;DR: At what percent (if any) will alcohol dehydrate you more/faster than drinking nothing? Let's contrive a situation for dramatic effect... A human goes out on a boat for a nice sail in the sea. ...
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1answer
190 views

Why do doctors still advise HIV+ couples to wear a condom during sex?

HIV infected people already have HIV, but why do doctors still advise condom use for HIV+ couples?
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How quickly can lasers of various wavelengths and powers impair human vision or cause pain in the eyes?

There is a discussion on HackerNews about how self-driving cars might be susceptible to confusion attacks using a cheap laser pointer and a RaspberryPi. Some people argue that human drivers, too, are ...
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2answers
96 views

It's right to say coding sequence is part of exon sequence?

Some basic ambiguities making me confused. I downloaded 5'UTR, CDS, 3'UTR, and exon sequences, separately from Biomart for a gene P4HA2 (Homo sapiens) and found some simple sequence repeat (SSR) on ...
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11 views

how is humidity related to amount of water we should drink [duplicate]

Is there any kind of relation between humidity and the amount of water we should drink. I know there is a relation between the temperature and the amount of water needed by the body. Do we need to ...
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1answer
67 views

What is difference between several mRNA RefSeq for one gene?

I'm looking for mRNA RefSeq sequences for a given gene in the UCSC genome browser by searching gene name "HLA-F" in human (scroll to Refseq genes section). There are several RefSeq mRNA for the gene, ...
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61 views

Can bigger persons generally resist g-forces better?

I've seen a claim that bigger persons generally resist g-forces worse than smaller in an undergraduate biology book. However this claim was supported by the argument that blood has to travel a longer ...
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42 views

Why do we pass out when we are under attack?

It is known that we might pass out, but not die, when we are under attack, e.g. got striken at the neck, blown by blunt object at the cerebellum etc. Wouldn't it be more "advantageous" to be conscious ...
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1answer
98 views

Why Do we close our eyes while sneezing?

Google says germs may fall on eyes from our sneeze but it happens all the time . Also it says it a part of contraction. What may happen if we sneezing wirh our eyes open ?
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23 views

Is it better to eat something that is more or less related to humans?

My question is, would it be better to eat something like a sea cucumber or would be it better to eat a chimpanzee? Maybe this isn't a dichotic answer. Is it better to eat something in between, like ...
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0answers
56 views

What options are there to consume water and can you survive on them alone?

I thought about this a while, i can think of several ways, but i am not sure if there are other options and if you can survive on them alone withou dying of dehydration (lets ignore other problems ...
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1answer
143 views

How is pain induced by blunt and sharp objects?

Normally, when something touch you, you won't feel pain. With a great force "touching" you, you will feel pain. However, if something that is spiky makes contact with you, you will feel pain. So, how ...
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122 views

Why I don't feel pain when I press the skin on my knee and elbow?

Does the muscle on our knee and elbow have some speciality ? Why are we unable to feel any sort of pain when I pinch it ? I also did it with my Mom and Dad and result was same .
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147 views

Is there a way to prevent an HIV infection after exposure to HIV infected Blood?

If a person is accidentally injected with blood from an HIV+ person, is there a treatment option that can keep the person from developing an HIV infection?