226 Answered Questions for the topic human biology

06/05/19

Why do Kupffer cells not attack malarial sporozoites?
During malaria, why don't Kupffer cells (hepatic macrophages) attack the _Plasmodium_ sporozoites and stop schizogony, thus saving us from the disease?
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Human Biology Biochemistry Metabolism

06/04/19

What is the molecular basis of hangovers?
Well, most of us have experienced the wonderful feeling of the dreaded hangover. How does it work exactly? I imagine it has something to do with dehydration but what are the underlying... more
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06/04/19

What is our skin made up of?
Again, it is a basic question. What is our skin made up of? is it made up of many cells arranged in a systematic way or is it just like any layer say of a book?? what is the difference? where is... more
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05/27/19

How do the pharmacodynamics of the NSAIDs differ and are there "resistant" COX phenotypes?
I know that the non-steroidal anti-inflammatory drugs (e.g., aspirin, ibuprofen, naproxen) affect the enzymes cyclooxygenase (types I and II).Is there any difference in the degree to which these... more
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Human Biology Biochemistry Physiology Skin

05/24/19

How is sebum secretion regulated?
The principle of homeostasis in biology says that living organisms try to maintain some sort of equilibrium. Doing that requires the use of feedback mechanisms to regulate things like temperature,... more
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05/24/19

How do bile salts affect lipase activity?
**BACKGROUND**: It is well known that bile salts are needed for emulsification of fats. It is then said that this increases the surface area for activity of pancreatic lipase, implying that bile... more
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05/24/19

Why do the humans become sleepy after meals?
I don't know about all the mankind, but I know enough people, who becomes sleepy after their meals. Also, I'm not sure, what kind of food do they consume, but I personally get sleepy almost from... more
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Human Biology Biology Human Physiology Hair

05/24/19

Why does hair grow after trimming but remains at a constant length after a while?
Some hair especially body hair regrows after trimming but stops growing after a while. What is the mechanism behind control of hair growth and how is the length limit determined?
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Human Biology Biology Human Anatomy Nose

05/24/19

Why do I only breathe out of one nostril?
I was just sitting with my hand next to my nose and I realized that air was only coming out of the right nostril. Why is that? I would think I would use both, it seems much more efficient. Have I... more
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05/23/19

What is the speed of blood?
The speed of blood may vary from one place to another and may be quite low in the tiniest vessels compared to the biggest one. What is the speed of blood while exiting a normal human heart?
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05/23/19

Is monogamy a human innate behaviour?
As the question states, got curious and I was wondering if monogamy is an innate human behaviour or is it because of how we built society (religion, traditions, etc.)? Let's say we go back in time,... more
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Human Biology Pharmacology

05/23/19

By what mechanism does Risperidone swell breast tissue?
There has been much talk of the anti-psychotic drug Rispeirdone causing un-natural breast tissue growth as well as galactorhea (milk production). Especially in young men and boys.What is the... more
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Human Biology History Genetics Chromosome

05/22/19

How was the Huntington's disease gene's location found?
I read in the book "Why we get sick." by Nesse and Williams that:> Steady detective work and fabulous luck have enabled geneticists to> pinpoint the Huntington's gene on the short arm of... more
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Human Biology Pharmacology

05/22/19

Why Does Salt Water Help Sore Throats?
I am having some trouble understanding how salt water, a simple solution, could so effectively remove the pains of a sore throat. I do believe that the answer is closely related to hypo/hyper-tonic... more
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05/20/19

Do spinal cord reflexes (such as the knee-jerk reflex) continue to function under general anaesthesia?
The knee-jerk reflex is an example of a stretch reflex. Stretch reflexes are monosynaptic reflexes happening in the spinal cord without involvement of the brain.Does it mean that this reflex will... more
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Human Biology Genetics Enzymes

05/20/19

Can an adult without genetic lactase persistence still develop a tolerance for dairy foods?
While investigating the rise of adult lactose tolerance, I came across the news that China has been encouraging its citizens to drink more milk, even though most of the Asian population lacks the... more
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05/15/19

Blood draw from the elderly or those with tiny veins?
A lot of people have very small veins making it next to impossible to draw blood. Would a nitroglycerin tablet (or some other vasodilator) before drawing blood help to enlarge veins?
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05/14/19

Why do people say that trans fatty acids are bad for your health?
I've heard from several sources that trans FAs are bad for you and their consumption will lead to cardiac problems, and that they are indigestible.But I also learned from biochemistry that they... more
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05/12/19

Why does hair turn grey or white, and why does it happen later for some?
The question is pretty simple: what is happening molecularly when hair turns grey or white? I would imagine that it is due to the lack of a particular compound. I'm also interested in why some... more
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05/10/19

What is the purpose of gluconeogenesis?
The gluconeogenesis pathway seems quite pointless to me. I don't understand why an organism would want to spend energy to create a molecule that can then be metabolized again for less energy? The... more
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05/10/19

Effects of exercise on the brain?
I am well aware of the phenomenon of neurogenesis induced by exercise, as well as the dopamine release that results from exercise. I am really interested in neuropsychology and the effects of... more
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Human Biology Biology Genetics Enzymes

05/10/19

Can an adult without genetic lactase persistence still develop a tolerance for dairy foods?
While investigating the rise of adult lactose tolerance, I came across the news that China has been encouraging its citizens to drink more milk, even though most of the Asian population lacks the... more
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Expert Answers •1

05/10/19

During starvation, does the human body do anything to prioritize which organs receive nutrients?
When food is scarce, the body slows its metabolic rate to conserve energy. Are there any other systems or processes that prioritize which organs receive nutrients?
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Human Biology Biology Genetics Hematology

05/09/19

Origin, or source, of rhesus negative in human blood?
This is my first post here, so please be gentle. I recently learned that I have Rh- blood (I'm A-), and was idly looking into blood types on Wikipedia. I was surprised to find that relatively few... more
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Human Biology Genetics Hiv Virology

05/09/19

Are homozygous carriers of the CCR5-Δ32 allele fully immune to all known strains of HIV?
Or is there documented evidence of even one homozygous carrier contracting HIV and staying infected?
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