This tag is for questions about the general anatomical features of human beings as opposed to the anatomy of non-human animals.

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-8
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0answers
36 views

Why do we have buttocks at the back and not in the front? [on hold]

We have buttocks at the back and not in the front. Why? edit: I mean, why is gluteus maximus bigger than inner hip flexor?
2
votes
1answer
24 views

What is the distance between the sciatic nerve and the colon at the closest point?

Is it possible that a full colon impinges on the sciatic nerve? Is there anything that physically separates the sciatic nerve from the colon?
6
votes
2answers
2k views

Why does the sweat of children not smell like adults?

My kids sweat plenty in this hot heat, but they don't smell afterward. I on the other hand need all kinds of deodorant. Why doesn't kid sweat smell?
14
votes
2answers
3k views

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. Will it harm us (effect our ability to hear) when we hear ...
3
votes
2answers
379 views

Why has our nose evolved with the nostrils facing down?

For most animals, the whole bottom of their face sticks out and they have a snout with a mouth and nose at the end. But humans have a flat face and just a nose that sticks out. We used to have the ...
2
votes
0answers
20 views

Hypoglossal nerve location

I kind of know where the hypoglossal nerve is located when I look at the diagram but I'd like to know how far is the nerve from the skin and where is the closest area to the skin before and right ...
23
votes
2answers
17k views

How does cerebrospinal fluid circulate in the central nervous system?

Cerebrospinal fluid (CSF) is produced in the choroid plexus of the lateral ventricles and in the 4th ventricle of the brain. CSF then circulates through the ventricles of the brain and the ...
0
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1answer
48 views
3
votes
1answer
67 views

What causes the line patterns in the palm of the hand?

The line patterns on the hand are unique to each individual, but what causes these lines and re they advantageous in anyway?
0
votes
1answer
22 views

Does the term “upper extremity” include hands?

I see on http://en.wikipedia.org/wiki/Upper_limb that the term "upper extremity" seem to include hands. However, in many hospitals, there is a "Hand & Upper Extremity Service", which would tend to ...
3
votes
1answer
19 views

Does the palate truly house the sense of taste?

Source: Your “palate” is the roof of your mouth, and by extension, your sense of taste. I was reading Etymonline's entry for palatable {adj.}, which cites and derives from palate {noun}: ... ...
0
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0answers
52 views

Does ale give less of a hangover than a lager?

I got into an argument surrounding beer type and hangover. Apparently there is a opinion that ales give you less hangover than lagers do (considering same alcohol content consumed). My understanding ...
4
votes
1answer
2k 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?
7
votes
3answers
12k views

Why do toenails grow much slower than fingernails?

As the title suggests, I've noticed that my fingernail grow much faster than my toenails. For instance, I usually trim my fingernails every two week or so, but for toenails the number would be about 6 ...
1
vote
0answers
56 views

How can I see that the human hand has 27 degrees of freedom?

I have counted the degrees of freedom in my hand over and over and I keep getting the number 19. Suppose each finger has 3 degrees of freedom. Then 5 * 3 = 15. The wrist can rotate around or back and ...
12
votes
1answer
179 views

Average dimensions of the human back (anthropometry)

I am wondering if anyone can point me to (a scientific source that provides) the estimates of the dimensions (length x width) of the human back? I am specifically interested in the dimensions ...
4
votes
1answer
65 views

How pain can stimulate the vagus nerve

I'm trying to find out why a prompt, severe, short pain is causing a stimulation of the vagus nerve. What could the physiological explanation be? Is that because the pain is triggering the ...
5
votes
2answers
226 views

Can someone who cannot talk still whistle?

Can someone who has a damaged larynx, which does not allow them to talk, still create a tune when they whistle? I know that the larynx is what allows a person to manipulate their pitch and volume, ...
8
votes
4answers
878 views

Is there any way a human could whistle and be unable to speak?

Is there any situation anatomically, where a human could understand the speech of others perfectly, without any capabilities of speech themselves, but would retain the ability to whistle with a tune? ...
2
votes
1answer
178 views

When contracting a muscle will the muscle spindle stretch or contract?

When you contract your muscle, will your muscle spindle stretch or contract? And why? I was always under the impression that it was contracting your muscle spindle, but now I am not sure.
5
votes
1answer
39 views

Stretching and compressing bones

The Young's modulus of elasticity when a bone is stretched is : 16×109 and when it is compressed, it is 9×109 N/m2. That means, change in length will be more if you compress a bone as compared to ...
6
votes
2answers
308 views

Why is the opposite of plantar flexion called “dorsiflexion”?

Why is the action of flexing the foot so that the toes move anteriorly/superiorly (i.e. in the direction opposite that which they move during plantar flexion) described as "dorsiflexion"? In the same ...
6
votes
1answer
82 views

Do people that don't feel pain shiver in the cold?

There are a few diseases that cause an insensitivity to pain. This question asks about the relationship between the cold and pain, which got me thinking: Is shivering a response driven by the ...
1
vote
0answers
26 views

how food moves in horizontal coils of small intestines [duplicate]

This is a very very basic question, and I am looking at it more from point of view of physics. The small intestine is a highly coiled structure, which means it has horizontal coils as well. I can ...
0
votes
1answer
35 views

How does the Pectoralis Major work when doing a bench press?

Disclaimer, I'm not a biology undergrad and I only know the basics about muscle movement. I know that doing a bench press works the chest, and specifically the Pectoralis Major because, well, I feel ...
3
votes
2answers
72 views

What does it mean to have different “metabolism”?

We hear talk of different body types, and that it is more difficult for certain people to lose weight than others. On the other hand, when my physician recommends that I lose weight, they say that it ...
7
votes
1answer
101 views

What creates the feeling of 'excess' blood pressure to an area of the body?

If I hang upside down, and feel blood rushing to my head, what structures are actually responsible for me "feeling" this excess flow of blood? Baroreceptors? Mechanoreceptors? Something else? ...
5
votes
2answers
73 views

Why are there no artificial wombs yet?

If the conditions within the womb are mimicked, and proper amniotic fluid with constantly recycling nutrients is maintained, is it not possible to obtain an artificial womb? Is there anything missing? ...
4
votes
1answer
94 views

How does aging affect fingerprint?

Do fingerprints change as we grow from child to adult? Most notably, what is the effect of the increase in surface area of palms and fingers on the finger print? Does the finger print simply increases ...
0
votes
2answers
4k views

Will I grow taller? How can i tell? [closed]

I'm 17 and I'm about 160 cm and my weight is 47 kg . I just want to know if I will still grow taller ?
3
votes
0answers
193 views

Why are fingerprints different even in identical twins? [duplicate]

Why are fingerprints different from person to person? It can't be genetics. Even identical twins has different sets of fingerprints. What is the deciding factor that form and shape our fingerprints?
2
votes
1answer
90 views

What happens to our umbilical cord internally as we age?

I was always curious as to if or how much of the internal structure or workings of the umbilical cord are still in existence as we age. What happens to it over time? The wikipedia article naval ...
0
votes
1answer
477 views

why male penis not considered as cartilage? [closed]

Penis don't have bone like ears & nose, then why why male penis not considered as cartilage? en.wikipedia.org/wiki/Cartilage
2
votes
1answer
39 views

Can an upper forearm amputee correctly control the Median and Ulnar nerves

I'm an engineer who is looking to build a robotic hand for people without their upper forearm(from center of forearm in direction of hand), controlled by the Thalmic Myo(an EMG sensor). I am first ...
1
vote
1answer
64 views

What specific sensory nerves act as receptors for “pins and needles” (neuropathy)?

According to this excellent answer, the difference between "pain" and "pins and needles" (neuropathy) is that different receptors (sensory nerves) trigger in reaction to different stimuli. Different ...
1
vote
1answer
49 views

How and where do nerves share pathways to the brain?

I am interested in understanding how pain receptors send signals to the somatosensory cortex (the part of the brain that registers various nerve signals such as pain, presure, temperatures, etc). ...
3
votes
1answer
128 views

How to maximize lung oxygen intake?

What method of breathing provides a sudden surge of oxygen into the lungs filling it as full as possible in volume and density. Deep breaths? Shallow breaths? Breaths taken while bent over? Deep ...
0
votes
1answer
33 views

Does the size or mass of a body affect the time it takes for rigor mortis to sets in?

Does the size or mass of a body affect the time it takes for rigor mortis to sets in? For example: compare a 300 pound man to 100 pound girl to 5 pound animal.
1
vote
1answer
118 views

How do you call that part of the muscle that connects directly to the bone?

When you open up a chicken leg or a clam and you remove the meat, there is this little part that is connected to the bone and is not easily scraped off. What is this part called and what mechanism ...
6
votes
1answer
1k views

Is it biologically possible for an adult's eye color to change?

Can it be that the adult eye can change color? Specifically my question is about a unilateral color change, such that the color of one eye remains constant, while the other changes color over time. ...
3
votes
2answers
76 views

Is it possible to move your arms above your head when handcuffed in the back?

This move was seen in Pitch Black and i wonder if it is possible at all. Say you are handcuffed to a pole, hands in the back, and the pôle is a little higher than your head. You just want to do a ...
0
votes
0answers
48 views

Why do we have butt hair? [duplicate]

Why do we have hair on our butts? From what I understand, hair is generally used for warmth, but it seems like our buttox would be one of the last places on our body that would need warmth. Moreover, ...
8
votes
1answer
495 views

Do the right-handed people tend to use the right side teeth of their jaw to chew food more often than the left-handed people?

And vice versa, do the left-handed people tend to use the left side teeth of their jaw to chew food more often than the right-handed people?Or the frequency of food chewing distribute fairly to both ...
4
votes
1answer
76 views

Miscarriage in early humans

Today, about 10 to 20 percent of known pregnancy end in miscarriage. Pregnancy is a biological process that has been very well studied by medicine. As a result, modern medicine helps a lot to prevent ...
3
votes
1answer
132 views
6
votes
1answer
955 views

Why don't we have hair on palms?

We have hair all over the body except palms. What is the biological reason behind this? Thanks
7
votes
3answers
3k views

Can any other animal choke on food?

I read somewhere (I think it was Bill Bryson's book on the origins of the English language) that of all animals, we are the only ones that can choke on food (having something to do with how our larynx ...
2
votes
1answer
58 views

Anatomy of nervous system's sensory pathways

When I touch my hand on a hot stove, I feel pain. I'm interested in knowing all the main "endpoints" (components/parts of the body) that are involved in relaying this pain signal. As I understand it ...
3
votes
1answer
86 views

Why do we have two of some organs, but not all?

We have two eyes, but we don't have two hearts. Why do humans have two of some organs, but not all?
-3
votes
1answer
214 views

Are transgenders born physically different from others?

Are all children born with only either male or female body parts (other than exceptions), or is there actually a natural third gender with the physical characteristics of both genders, e.g. the child ...