226 Answered Questions for the topic human biology
06/27/19
Can parts of a human brain be asleep independently of each other, or vary in the times required for them to fall asleep?
I know that some birds and marine animals can continue complicated activity (swimming, flying?) while one hemisphere of their brain is asleep.I'm interested if human brain has some parts of it that...
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Why does mint oil feel cold on the skin?
When putting (japanese) mintoil on the skin it produces a cool feeling. You can experience this, when adding it to your bath or using a spray with mint oil on your skin. The cool feeling occures...
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06/21/19
What do sphingolipids do in humans?
I want to know the significance of sphingolipids in human. I have learnt that sphingomyelin is the most significant type of sphingolipid in human. Also that the sphingomyelin serves as a structural...
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Human Biology Biology
06/21/19
What is the armpit hair for?
Modern human beings, especially women, cut their armpit hair. It seems to me the armpit hair is trivial/useless. Shortly speaking, what is the armpit hair for?
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Superhuman eyesight?
My ten year old son was reading car number plates that were too fast, too far away and at the wrong angle for any of us to read or even believe that it was possible for him to read. We thought he...
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06/20/19
What kinds of cells does human saliva contain?
I have heard that our saliva contains cells. What cell types can be found in human saliva?
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Height and natural selection in humans?
I watched the documentary "Evolve" recently and in the segment on "size" Scott V. Edwards, Harvard evolutionary biologist mentioned the idea that humans might evolve to be 7' tall in 'hundreds of...
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06/19/19
Is it correct that the body only responds to the most painful stimulus?
*I'm rather ashamed to say that this question is partly based on an episode of House.*I have previously heard that, if there are multiple simultaneous painful stimuli, the mind will only feel the...
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Can/Have cancer cells be/been used in stem cell culture lines?
Since Cancer cells have unlimited growth potential, can they be induced towards totipotency and pluripotency? If so, can cancer cells be used in stem cell culture because of similar properties of...
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Why do Humans not produce Vitamin C like other mammals?
Why do most mammals produce their own Vitamin C? Why do Humans not?
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06/18/19
Can general soap kill bacteria?
I have read that general soap can kill bacteria by opening holes in the bacterial membrane.http://questions.sci-toys.com/node/90However, I found some articles as well saying that it...
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06/18/19
Will humans and animals be harmed by frequencies outside their hearing range? ?
The human ear (for example) is sensitive to frequencies from 20Hz to 20kHz. Any sound beyond that limit would not be heard by us naturally. 1. Will it harm us (effect our ability to hear) when we...
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Supercomputer Vs Human Brain?
With supercomputers doing calculation in petaflops ($10^{15}$ Calculations per Second), have we crossed the speed of Human Brain?
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06/17/19
Why do we have five fingers?
Humans (and other humanoid mammals) have five fingers in each hand. Curious to know, why five? Wouldn't more fingers be more useful? Is there any evidence that it used to be different and natural...
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06/17/19
What do ants do with human finger nails?
There is place in my house where I cut my nails. Here, there is an ant hole where an ant colony is seen.Whenever I cut my nails from here, they take my nails inside their hole. I was wondering what...
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06/16/19
Why do people have antibodies against other blood types?
The ABO blood type divides each blood type according to whether they have the "A" and "B" antigen(s) (AB has both, O has none). People also have antibodies against the antigens they don't have (AB...
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06/15/19
Why does the ring finger not move independently?
Why is it that we need to move little finger in order to move ring finger with it? For example, put your palm on a table and fold your middle finger inside. You won't be able to move your ring...
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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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Why don't teeth glow?
Hydroxyapatite is the main component of tooth enamel. It contains phosphorus in the form of phosphates, pyrophosphates etc. that are found to exhibit the the property of phosphorescence. But why...
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Can humans eat grass?
Can a human eat grass and digest it? Could it be possible to use it as food just like other plants such as wheat or beans?
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06/08/19
How did the cardiovascular system evolve?
How has evolution created our blood, lungs and the heart?We can't exist without blood, which transports the oxygen to all areas of our body. However, the blood needs a lung, which gives it the...
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Human evolution: Where *exactly* did the first human come from, whose parents were not?
Layman here. So I have never really quite understood this facet of human evolution, (or any other for that matter), in that, I understand the evolutionary process, but I get lost on the 'border'...
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06/05/19
How much time does it take for the naive T Cell to get activated?
Suppose a naive T cell comes in contact with an APC. How much time does it take for the T Cell to get activated and within how much time does the T cell move away from the APC due to...
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