226 Answered Questions for the topic human biology

03/19/19

What's the maximum and minimum temperature a human can survive?
This is a question that has been in my mind since I was a kid. I'm not a doctor, nor even a biology student, just a curious person. What is the minimum and maximum temperature a human body can... more
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Human Biology Physiology Pharmacology

03/19/19

Are there any situations in which phenylephrine is preferred to pseudoephedrine?
In the mid 2000s in the US, due to issues of drug enforcement, pseudoephedrine containing medications were brought behind the pharmacy counter and in most cases require ID, and phenylephrine was... more
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Human Biology Biology Hydration

03/19/19

Why is cold water more refreshing than warm water?
Obviously, the temperature of water does not affect its chemical composition. At least not in the ranges we are likely to drink it in. Yet it is clearly far more pleasant and refreshing to drink... more
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Human Biology Biology Pharmacology

03/18/19

How does laughing gas (N₂O) work?
Laughing gas (N2O), well, makes people laugh. How does just a gas make us do that, there has to be some hormones at work...So, I wanted to know how this works? What is the mechanism?
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Human Biology Biology Homeostasis

03/18/19

If body temperature is 37°C (98.6°F), why are most people more comfortable at around 21°C (70°F)?
It may be different for other people, but for me, anything above 32°C (90°F) is very uncomfortable, and my body is inclined to seek cooler temperatures. But I would think that at 32°C, the body... more
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03/18/19

What causes a 'stuffy' or 'runny' nose when you have a cold?
When humans get the common cold, a common symptom is a stuffy or runny nose. Is that the body's immune response or is that the virus's doing?
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Human Biology Biology Cell Biology Surgery

03/18/19

How much of the jejunum is bypassed during gastric bypass?
There is both long and short limb gastric bypass surgeries (along with several other variations on intestinal bypass procedures). How much of the jejunum is bypassed with a long-limb and short-limb... more
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Human Biology Pharmacology

03/18/19

How does laughing gas (N₂O) work?
Laughing gas, well, makes people laugh. How does just a gas make us do that, there has to be some hormones at work...So, I wanted to know how this works? What is the mechanism?
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Expert Answers •1

03/18/19

Why can hair grow without limit while eyebrow cannot?
I cut my eyebrow and it grows until reach a certain length. Hair can grow without limit.Why can hair grow without limit while eyebrow cannot?
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Human Biology Biology Neuroscience

03/18/19

How do the brain and nerves create electrical pulses?
The information between the brain and peripheral nerves is sent via electrical pulses or signals, How then does a non-metallic human cell manage to conduct an electrical signal?
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Human Biology Biology Memory Neuroscience

03/17/19

How and where, in the human brain, are memories stored?
Background: I am a computer programmer who is fascinated by artificial intelligence and artificial neural networks, and I am becoming more curious about how biological neural networks work. Context... more
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Human Biology Biology Cancer Hematology

03/17/19

Can a cancerous cell from outside cause cancer in a healthy person?
If a cancerous cell enters the body of a healthy person from someone else's blood or something, will that healthy person get cancer? In human beings.
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Human Biology Biology Reproduction

03/17/19

Cells of umbilical cord - mom's or son's?
Let's say we have a mother giving a birth to a son. In a very clear manner the cells of these two individuals are very different, of course. Yet there is an umbilical cord connecting them. Then... more
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Human Biology Biology

03/16/19

What is the healing process of mouth wounds?
When we have an external wound, blood generally tends to clot there, forming a layer of solid scab.Yesterday, while brushing my teeth, I somehow hurt my gums and it got all bloody. However, it did... more
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03/16/19

What is the evolutionary reason behind the fragility of teeth?
Almost all organs in the human body have a rather large threshold within which the organ or tissue is capable of repairing itself using materials supplied by the body, whether it's made from... more
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03/16/19

İrreversible dopamine antagonist vs. Dopamine agonist?
Can a dopamine agonist reverse the effects of an irreversible dopamine antagonist?
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Human Biology Biology Neuroscience

03/15/19

How does the brain's energy consumption depend on mental activity?
What is the impact of mental activity on the energy consumption of the human brain?I am most interested in intellectually demanding tasks (e.g., chess matches, solving a puzzle, taking a difficult... more
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03/15/19

What is the mechanism behind "acquired" alcohol tolerance?
I can understand natural variation in alcohol dehydrogenase (ADH) in a population leading to variation in rate of inebriation (after controlling for other variables -- e.g., mass, food consumption,... more
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Human Biology Biology Genetics Dna

03/15/19

Knockout and knockdown of gene?
Out of curiosity, I got this question whether knocking out (deletion) of a gene on one side and knocking down (RNAi) of the same gene on the other side will affect the cell in a similar manner or... more
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Human Biology Biology Genetics Microbiology

03/15/19

Are all functions of a human cell known?
Please bear with me as I'm intruding into your world from a computer science background. In programming, once you have created a program, you know all functions of that program. Thus, 100%... more
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Human Biology Biochemistry Physiology

03/15/19

What is the mechanism behind "acquired" alcohol tolerance?
I can understand natural variation in alcohol dehydrogenase (ADH) in a population leading to variation in rate of inebriation (after controlling for other variables -- e.g., mass, food consumption,... more
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Expert Answers •2
Human Biology

02/18/19

an alternate mass form of an element is called an
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05/16/18

If the radius of a blood vessel is 1/4 of a millimeter what is the resistance offered by this vessel?
If the radius of a blood vessel is 1/4 of a millimeter what is the resistance offered by this vessel? Suppose the vessel relaxes to 1/3 of a mm. what is the new level of resistance?
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05/16/18

Partial pressure of oxygen in blood in alveolar capillaries leaving the lungs would be.....
Partial pressure of oxygen in blood in alveolar capillaries leaving the lungs would be________ mm of Hg.10) Partial pressure of carbon dioxide in tissue is greater than ________ mm of Hg.11)... more
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05/16/18

with an atmosphere at pressure of 700mmHg. It turns out that 70% of this atmosphere....
Elon Musk’s Martian Expedition discovers a huge underground chamber with an atmosphere at pressure of 700mmHg. It turns out that 70% of this atmosphere is nitrogen, 25% is carbon dioxide and the... more
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