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
40 views

Did the Britons 100 years ago have different intestinal flora and fauna?

Note: this is not a question about history, but about human digestive system over time :) I know a lot of colleagues who traveled for business trips to India. All of them caught terrible diarrhea ...
1
vote
1answer
27 views

Evolutionary support for parenting book “The happiest baby on the block”

The book by Dr Harvey Karp (MD) The Happiest Baby on the Block proposes that the duration of human gestation has evolved as a tradeoff between cranial size and development of the infant. He ...
4
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2answers
803 views

Do biological facts determine when a human fetus is considered alive and human? [on hold]

I often hear or read this statement: "It's not a human, it's a fetus." In other words, some think a fetus is non-human until a certain point. And another similar statement: "The fetus isn't ...
2
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0answers
38 views

force required to do damage to child's leg/feet in collision [on hold]

I'm currently working on a toy robot for a student project. Part of this robot is the fact that it will be moving around quite fast. As such hitting the child can and most likely will happen. As such ...
3
votes
2answers
49 views

Is it possible to calculate the energy required to speak a word?

I was discussing with a colleague whether speaking would require more energy than communicating via instant message (GTalk, etc..). If this is possible, then I'm particularly interested in whether ...
2
votes
1answer
19 views

Difference between sequential and conformational epitope

Is the difference only in its structure? Like conformational epitope has 3D structure while sequential has a linear structure?(I have not studied biology since last 8 years and now I am going through ...
4
votes
2answers
63 views

What is MHC haplotype?

What is MHC haplotype? I did check out the wiki article, but did not understand. (I have not studied biology since last 8 years and now I am going through it because I need it for my research. So if ...
0
votes
0answers
25 views

Educational Materials (Graded) for Human Biology and Chemistry [on hold]

I was wondering if anyone could recommend educational materials and resources (such as text books) that covers human biology and chemistry together, preferably with beginning, intermediated and ...
2
votes
1answer
23 views

Kinesiology Tape Benefits

Recently, kinesiology tape has become popular, especially in CrossFit. I have also noted its' use in the NFL, and I want to say Tennis as well. What beneficial effects does this tape offer our bodies ...
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0answers
23 views

Should I be worried if I sweat too much? [closed]

I have been facing this since I was young, when I played the piano, my palms would become sweaty. Lately I've been noticing my hands have been sweatier than ever, and even the soles of my feet. This ...
4
votes
1answer
47 views

Oxidation means inflamation?

All right, I was reading article on nutrition, that focussed on content analysis of pastry-like food product for kids. I have to say that I am not sure this article would pass the imaginary smell ...
3
votes
1answer
159 views

Why do I breathe out of BOTH nostrils?

After reading the question why do I only breathe out of one nostril I realized that breathing out of both isn't common. I have always breathed out of both, and when I get a stuffy nose, or a runny ...
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0answers
18 views

Highest Pressure Human Body Can Survive In?

One design for underwater human inhabited environments is to have equal pressure between the surrounding water and the submerged habitat, thus allowing a section of the floor to be open to the water ...
1
vote
1answer
46 views

What is the use of shampoo; is it for the hair or for the scalp?

Apologies for the confusing question; I did not know how to better ask it. I was doing a search on wikipedia when I found this statement. Wikipedia's entry on hair states; "The hair that is ...
109
votes
4answers
11k views

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 ...
11
votes
2answers
4k views

Why doesn't water enter my body through my anus or genitals when swimming?

So when we swim, we can make water not enter through our nose and mouth, simply by holding our breath. However, the mouth and the nose aren't the only cavities. What about the anus and the genitals? ...
8
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2answers
1k views

What would happen if one eats silica gel?

What happens if one actually does go about eating the beads in those "do-not-eat" packets?
6
votes
1answer
810 views

Chest muscle and female breast size

Do female chest size have anything to do with muscle? I know many female athlete and their average breast size is much bigger than normal female that does not tend to play sports. Do this have any ...
0
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0answers
11 views

Stress-responding enhancer?

I wonder if anyone knows a well characterized human enhancer which has been shown increased activity (in e.g. reporter assays) under stressed conditions, such as DNA damage, hypoxia, ...
4
votes
1answer
47 views

How efficient is the human body at metabolizing food?

My friend and I were having a discussion over how "efficient" human digestion is. If a human ate a 1000 calorie hamburger, how many of those calories (how much energy) does the body process into ...
2
votes
1answer
108 views

Why do we absorb vitamins better from whole foods than from pills?

We can't rely on pills to provide us our nutrients because we don't absorb the nutrients from the pills as effectively. Presumably this is because pills are lacking components that are required for ...
3
votes
3answers
96 views

Why can't you just take a vitamin? Why you need a healthy diet on top of that?

From what I understand, your body needs certain amounts of vitamins and minerals to maintain health. Why can't we just take enough pills to obtain these vitamins and minerals?
1
vote
1answer
33 views

Do the eyes play any role in producing the visual experiences you have during dreaming?

Sometimes, you remember a vivid picture of a dream that you saw. What is the role of your eye in this experience? Please provide me with the answer that is as simple as possible since I am in Class ...
2
votes
1answer
96 views

Are retroviruses cytotoxic?

There are typically hundreds of retroviruses found in healthy human beings. Are retroviruses then cytotoxic? (In other words, are they able to kill or damage other cells).
0
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2answers
54 views

Why are human children more likely to get lice (nits) than adults?

By my own experience, lice seems to be prevalent in the hair of human children, but not in adults. My question is Why are human children more likely to get lice than adults? Assumptions: Can be ...
2
votes
2answers
39 views

What is a membrane potential?

I know this may be silly, but I am confused to what a membrane potential actually is. I understand that at resting membrane potential is -70- -80 mV. But what does that exactly mean and how does this ...
2
votes
2answers
516 views

What happens if a person has the right side of the body totally removed (including the brain)? [closed]

I guess humans could live without just the right lobe of the liver or the right brain. Could a person without the whole right side of body survive? The left brain controls the right side of the ...
17
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2answers
2k views

Why was disease transfer to the Americas one-way?

It is well known that the European colonists brought many infectious diseases to the Americas, and that these had a deadly effect on the native populations, because they had no immunity to them. Were ...
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0answers
37 views

How to stop or slow down the process of growth of hairs? [closed]

Is it possible to slow down or stop hair growth? If yes, then how is it achieved?
1
vote
1answer
20 views

What triggers the release of gonadotrophin-releasing hormone with the onset of puberty?

I am interested to know the process of development of puberty. During puberty, when boys/girls reache 12-14 (puberty) years of their age, their hypothalamus releases gonadotropin releasing hormone ...
3
votes
1answer
83 views

Is there a difference between drinking water straight from the tap compared to leaving it to sit?

An idle question - if a glass if filled from the tap and consumed immediately, it contains some dissolved oxygen from the physical process of moving through the pipes & tap. If left out ...
1
vote
1answer
33 views

Gastro-intestinal physiology reference

I am a physicist but I have always wanted to understand how my digestion takes place in as much detail as possible. I have no idea about books or reference on the subject of Gastro-intestinal and ...
5
votes
4answers
117 views

Why do fat people tire quickly?

Fat people have a large amount of calories (energy) stored, but I have noticed all time when they do physical activities they get tired fast in comparison to fit people - why does this happen?
6
votes
1answer
55 views

Why ml scale blood retrieval is required to run a blood test?

Substances found in blood are present at microscopic scale and tend to be invisible to the unaided eye. Why is a whole vial of blood (at ml scale) is required to assess the presence and concentration ...
2
votes
1answer
81 views

How much time does it take a human body to replace all of its atoms?

Mikel Vsauce (Vsauce youtube channel) said in his video that it takes about 5 years for the body replace all of its atoms, while in asapscience youtube channel they are claiming that it takes 10 ...
1
vote
1answer
63 views

Do human anal glands have any function?

Anal glands in all kinds of animals play a range of diverse functions - providing fat for preening feathers or waterproofing fur, generating distinct scent, even repelling predators. None of the ...
15
votes
2answers
4k views

Why isn't vomit corrosive?

Vomit comes from gastric acid, right? And in gastric acid there is HCl and HCl is corrosive (strong), how come when I vomit, it doesn't destroy things that it (as the vomit) hits (such as floor, ...
2
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0answers
42 views

Human body control? [closed]

What can we consciously control in our bodies besides our muscles and brain (thought, memory, etc.)? Is the notion Bio Feedback related to this matter? EDIT: I mean I can move my muscles at will but ...
5
votes
3answers
111 views

What is the point of having evolved two nostrils?

How would having two nostrils be advantageous to your sense of smell or your ability to breath? I already hypothesized that either one of the nostrils could act as a back up for when another gets ...
4
votes
1answer
120 views

Difference between intervertebral and vertebral foramina

In the human spine, what is the difference between intervertebral and vertebral foramina? Is it just a matter of perspective and do they refer to the same thing or are they different?
5
votes
1answer
193 views

Evolution of umbilical cord and reason of its elongation

To answer a question myself, recently I've read that Years and years ago, a long umbilical cord enabled a woman to grasp her baby after birth and run away from predators" Update: $Question:$ ...
3
votes
1answer
98 views

The smell from eating asparagus

I am wondering about one thing. I have read different accounts of this (prior to reading it on Wikipedia), so I am wondering. Here are the two versions I have read: asparagus leads in a certain ...
3
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2answers
160 views

Standard Process Identification of New Disease outbreak Causing Pathogen

Is the any standard procedure or protocol followed for the identification of cause of new disease outbreak(or new pathogen)? Is it different for different countries?
6
votes
1answer
310 views

Do identical twins have the same fingerprint?

When there is every thing same from their genes to their phenotype so then why they don't have same fingerprints?
1
vote
1answer
29 views

Why are high levels of epinephrine and low levels of cortisol signs of stress?

According to my psychology textbook (Psychological Science: Modeling Scientific Literacy), high levels of epinephrine and low levels of cortisol are signs of stress. However, earlier in the textbook ...
1
vote
0answers
32 views

Is there a difference between endorphins that are released while physical activity and sex/masturbation?

I observerd myself and I can identify two different types of "happines". First - called by me - After Pleasure : Occurs AFTER (and last long) long activity that require from me engagement focus and ...
2
votes
1answer
164 views

Why do humans seem so much more prone to disease than animals? [closed]

It seems like when we observe animals in the wild, the occurrence of noticeable disease in adult individuals is much lower than in humans. Why? There are a number of reasons that this could happen, ...
3
votes
2answers
274 views

Why doesn't the human skin grow back exactly how it was before being damaged?

Very simple: Why (and how) is regenerated skin different from original ? As we know we lose skin cells that becomes the dust in out homes and it always grows back to full thickness right ? So when I ...
3
votes
1answer
52 views

Is there revolution in humans since the first homo sapiens sapiens

In a thinking mood, I was wondering if the human species has changed since they have first become homo sapiens sapiens. I asked myself this question because I was thinking about how we will evolve ...
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0answers
44 views

Can two women have a daughter? [duplicate]

In vitro fertilization is a pretty routine procedure in which a female egg is fertilized by sperm outside the body. Recently apparently there has also been something similar in which the genetic ...