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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1answer
135 views

Would urination continue after death?

If someone was urinating, and they were to hypothetically suddenly "fall dead" (the brain is unconscious and all muscles / organs are unfunctional), would they continue urinating or would it stop?
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0answers
36 views

What happens to the mold spores we inhale?

What happens to the mold spores we inhale? I'm guessing when we exhale, many of them are expelled back out to the environment. But given that disease can be caused by mold exposure, I'm also ...
2
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1answer
79 views

What are the highest and lowest amplitude values in ECG for humans?

I'm currently trying to parse the records captured from an ECG device and display them on a mobile application. I am wondering what the highest and lowest possible amplitude values for ECGs are in ...
2
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1answer
71 views

When you take a very cold or hot bath how is that influencing your breath?

It looks like when you take a cold shower or bath your veins get smaller and when you take hot shower your veins get wider. But is that right and do you need to breath more in both cases because you ...
5
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1answer
208 views

What is the function of the polar bodies produced during oogenesis?

Why are polar bodies produced during oogenesis in human females? I read that polar bodies are produced during meiosis so that the oogonium (or gamete mother cell) can be converted into a haploid ...
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0answers
24 views

Does the source of caffeine affect the biological impact?

I've recently decided to give up my morning coffee in lieu of a caffeine pill. Both are around 200mg (my Tim Horton's XL 4x4 was 240 mg of caffeine) of caffeine. We were talking about the various ...
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2answers
53 views

How does the mechanism which controls blood pressure in the brain work? [closed]

I've heard that the blood pressure in the brain is organised by a special mechanism. What is that and how does it work?
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0answers
15 views

Is the efferent arteriole a pathway for filtrate through the nephron ?

I am studying the urinary system. I have to identify what part of the nephron is not a pathway for filtrate. I believed the collecting duct is not a pathway for filtrate because once the filtrate ...
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0answers
10 views

how to see prefrontal cortex works normally by a test?

Is there a test to see if the Prefrontal cortex of someone works normally? especially a simple test like a questionnaire that you give the individuals to fill out and based on their answer you obtain ...
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1answer
82 views

What causes swelling after impact?

Why does the head swell after getting hit by something hard? What is the liquid that forms after impact?
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2answers
81 views

Crossing over and exon shuffling?

Campbell Biology 10e, in discussing the functions of introns, writes: The presence of introns in a gene may facilitate the evolution of new and potentially beneficial proteins as a result of a ...
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0answers
22 views

Did the number of rods changed from ancient time?

Correct me if I am wrong, but I know that rods work under limited light conditions only. But now we are in a world that always have lights everywhere unlike ancient time when humans had to deal with ...
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1answer
36 views

Difference between the spinal cord and vertebrae column [closed]

What is the difference between the spinal cord and the vertebrae column, they both run through from the head to the abdomen. Does any one have any idea.
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0answers
14 views

What is the difference between chloride shift and Bohr shift?

Does anyone know the difference between chloride shift and Bohr shift? Is it that Bohr shift happens in respiring tissues when CO2 concentration is low, and that Chloride shift happens in the blood ...
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2answers
835 views

How long do viruses, such as Zika, stay in the body?

Can a virus stay in your body (after recovery) in a concentration that is sufficient to infect someone? Is it known how long the Zika virus persists in the body?
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0answers
51 views

Model for Oxygen diffusion into tissue? [closed]

Currently I have an idea and want to research it's feasibility. I want to know how oxygen or any other particle could diffuse into the body through small holes in the skin. is it possible to ...
1
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1answer
37 views

The impossibility of making a human in a lab [closed]

Am I right if I say that the only place where the right conditions exist for developing a human being is the womb, so that people will never be able to make a human being in a lab? In order to develop ...
3
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0answers
32 views

In the life-cycle of the HIV virus, how does the created DNA enter the nuclear membrane?

I am in a high school biology class, so I cannot truly attest to how accurate the information I am given is, but as far as I know only RNA and very small molecules can enter the nuclear membrane ...
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0answers
63 views

When and why did humans start disliking the way we naturally smell? [closed]

Like many animals, humans produce a myriad of scents from sweating, bacteria, possibly pheromones, etc. Many of these scents are used throughout the animal kingdom for mate choice, recognition of ...
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1answer
44 views

What is a catalytic domain?

I have to answer a few questions from an article I'm reading, and I am just really confused on defining "catalytic domain." I have to relate it to the antibiotic Teixobactin. Is catalytic domain the ...
2
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1answer
49 views

Do the antibodies in a patient suffering from Hashimoto's, attack the thyroid hormones or the thyroid gland (or both?)?

If oral thyroid hormone supplement is administered, is the attack stopped or does it just create an excess of thyroid hormones so that even after a lot of it is destroyed by the antibodies, there is ...
2
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0answers
39 views

Why are eye defects so common? [duplicate]

The title says it all, what makes eye defects so common in the world? Whereas defects of any other body part is quite uncommon, I searched online and one of the articles said that 6 out of 10 people ...
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1answer
92 views

Short dated spontaneous ringing in ear [closed]

What causes very high pitched sound in one's ear?
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2answers
142 views

Growth factors vs. mitogens

According to Campbell Biology, A growth factor is a protein released by certain cells that stimulates other cells to divide. and according to Wikipedia, A mitogen is a chemical substance ...
2
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1answer
29 views

Advantage of GCPRs over RTKs or other receptor protein kinases

My book lists two important differences between GCPRs and receptor protein kinases: GCPRs do not directly activate a signal transduction pathway. It only does so indirectly, via a G protein. On the ...
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0answers
66 views

Can one eye affect the other eye's low-light adaption?

This previous question addresses how long eyes need to adapt to darkness and reach full contrast. My question is how does one eye affect the "transition" and/or efficacy of this "night vision" of the ...
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1answer
37 views

What is the best way to block cigarette smoke from the body? [closed]

Would it be better to hold your breath after smelling the presence of it or quickly inhale and exhale to get rid of it in your system(body)? EDIT: Changed from carbon monoxide to cigarette smoke.
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3answers
7k views

Can the dead be brought back to life by viruses?

Zombies have been a part of popular culture for decades. The living dead rising up to take over the world is a terrifying concept, worthy of Hollywood blockbusters and television hits. Some of those ...
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1answer
99 views

Which literature/study/myth spurred the idea that urine is sterile?

There is a seemingly unfounded mantra that a person's urine is sterile who is not suffering from a UTI. So far I have found convincing evidence to the contrary; urine is not sterile. This poster ...
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0answers
14 views

What fills the spaces between non-fused sacral vertebrae?

What is in between the sacral vertebrae before they are fused? I have looked and found no specific descriptions. If it is simply cartilage, what type of cartilage?
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0answers
40 views

Does medication make the body dependent? [closed]

First of, I know of course that certain medication can cause an addiction if incorrectly used. But as far as I understand it, drugs prone to cause addiction have some agent in it, that makes them ...
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0answers
26 views

Are there fundamental differences between the adaptive immune systems of higher primates and other mammals?

I recently attended a Leukemia and Lymphoma Society lecture in which one of the lecturers indicated that there are fundamental differences between the adaptive immune systems of higher primates and ...
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1answer
43 views

What is 'noise'?

In both my psychology, biology and neuroscience classes, professors are constantly talking about 'noise'. For instance, our perception is limited due to 'sensory noise' in our neurons. I am utterly ...
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1answer
75 views

Does evolution thinks? [closed]

I understand evolution as survival of the fittest rule , where its the nature and surroundings that shapes the life by extinction of species which are not fit to survive the nature at that period. To ...
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2answers
65 views

Skull size of Homo naledi

I want to 3D print the skull of the newly discovered Homo naledi. The printing data can be found here: http://morphosource.org/index.php/Detail/MediaDetail/Show/media_id/7300 Where can I find the ...
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2answers
196 views

At any given moment, how much energy is stored in the human body as ATP?

At any given moment, approximately how much energy is stored in the human body as ATP in the ADP-P-bond? This of course depends on what type of cell it is and the activity of the individual in ...
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0answers
30 views

Why is exocrinous pancreatic cancer so lethal when compared to others?

I know it seems far fetched, but I would really like to understand why an interference with the regulation of production of pancreatic exocrine products (and which are they) is so lethal. I know that ...
5
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1answer
250 views

What is the maximum altitude where humans can survive?

What is the highest altitude that a human can survive without being pressurized? Let's assume that oxygen and heat/insulation are not the limiting factors? Why I asked.
5
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1answer
29 views

Constant or variable number of chiasmata during recombination?

During recombination, is the number of chiasmata consistent for each gamete and are the chiasmata regions consistent within a single organism?
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1answer
137 views

Do human somatic cells have 46 chromosomes all the time?

As far as I know, a human somatic cell has the cell cycle: Interphase and Replication (mitosis). In interphase the cell has 2 growth phases (G1 + G2) and a synthesis one (S phase being in between G1 ...
4
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1answer
134 views

Why do we sleep?

While we do know that the human body is regulated by a circadian clock that keeps humans on a sleep/wake cycle, we don’t really know why. Sleep is the time when our bodies repair tissues and perform ...
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0answers
17 views

Ions in different cell compartments

I would like to understand the distribution of metal ion concentrations (such as Mg2+) in the different cell compartments. I tried very hard but still couldn't find such information. Could anyone ...
4
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1answer
218 views

Could a trans-female person ever become pregnant?

I was told that a transgender person, which I will define as anyone assigned male or female at birth that identifies opposite to that assignment, could never become pregnant conceptually, due to the ...
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1answer
54 views

Are there testosterone receptors in female mammary tissue?

Does female mammary tissue have receptors for testosterone hormones? Do male hormones influence female mammary glands, as female hormones influenced the male mammary tissue, such as in gynecomastia? ...
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0answers
72 views

Is hypoxia/anoxia the ultimate cause of death?

I know there are different causes of death for humans like heart disease, cancer, stroke, injury and so on, but i was thinking if in every case in the last instance death is due to hypoxia/anoxia. ...
0
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1answer
110 views

Why do we have two eyes? [duplicate]

Humans, animals and birds all have two eyes. Why? In addition to why two instead of one, why aren't there more than two?
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0answers
22 views

is there a difference in meaning between the terms “bone architecture” and “bone structure”?

I'm wondering whether "bone architecture" and "bone structure" mean the same thing, or whether they refer to two different concepts. In this article - ...
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1answer
76 views

Is eradication of the Common Cold possible?

This is a thought experiment, but everywhere I've read seems to say that colds ALWAYS come from someone else. There's no mention of a cold arising in someone without it coming from another infected ...
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0answers
38 views

Life after decapitation? [duplicate]

I saw a video where an ant lost its head and was still walking for some time. If this is possible for an arthropod, what keeps it from working with a vertebrate? (Humans, especially)
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1answer
58 views

Genotype of children conceived after stem cell transplant?

If you have sickle cell disease and have a succesful stem cell or bone marrow transplant, your blood type changes to AA. But what about your future children? Do your sperm or egg cells continue to ...