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Questions tagged [human-anatomy]

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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Many black people I've met have bigger lips than white people, why? [duplicate]

I noticed that many black-ish people I've met have bigger lips than the white-ish people I've met. However, not all black-ish people have big lips. Is there any explanations in terms of natural ...
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2answers
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Why do I have two kinds of pubic hair? [closed]

I feel silly even asking this question, but there's a quirk of my anatomy that I find interesting, and I can find nothing about it online. I am looking for information on whether this quirk is ...
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1answer
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Are releasing-hormones and release-inhibiting hormones from the hypothalamus ever present in the blood?

Our teacher said that these two hormones are normally never present in the blood stream, and to be carfeul of it if it comes as a question. I'm not conviced to be honest, is this true?
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Are asian eyes better at sun protection?

Today I have visited a very popular tourist place in Tokyo. It was a very sunny weather and there were HUGE crowds of Japanese tourists and I was one of very few Europeans. I have noticed a surprising ...
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What secretes the pericardial fluid that protects the heart from the contraction's friction?

As you guys know, the membrane that protect the heart is the pericardium, which consists of 1) The serous pericardium, which is divided into visceral pericardium and parietal pericardium, secretes ...
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Understanding hyper- vs hypokalemia

After searching the web for a while, I found that: Hypokalemia results in a prolonged Q-T wave interval Hyperkalemia results in a peaked T wave and a wide QRS complex Now, I'm trying to understand ...
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How far into the periphery does the dura mater extend and how does it terminate?

The dura mater surrounds the central nervous system, but it does not surround peripheral nerves. Where does the dura mater "stop" and how is the CSF kept from leaking out in the periphery? Where is ...
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1answer
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Anatomy of joints of human hand

Q) A girl slipped and is falling. She puts out her arms to prevent falling. Which joints are most affected by her fall? Fibrous and Synovial joints. Cartilagenous and Synovial joints. Fibrous and ...
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1answer
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Using formulas to explain why contraction of blood vessels leads to increased blood pressure

I know, I know this is probably a question too simple to be asked on a forum like biology stack exchange. Problem is, I looked many places and can't seem to find a more mathematical approach to ...
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103 views

Are all of our hormones synthesized in the same gland that they are secreted from?

For example, growth hormone is secreted from the anterior pituitary; is it also synthesized there?
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112 views

Why hasn't evolution gotten rid of the appendix yet?

A figure I have recently stumbled upon suggests that about 7% of the world population will, or have, had appendicitis in their lifetime. Cutting out the appendix was impossible until very recently. ...
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Are there examples of sexual selection effecting traits in both sexes equally?

I've had an ongoing interest in the evolution of human furlessness and this appears to be a notable example of attributing a trait that effects both sexes to sexual selection. Darwin suggested it was ...
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1answer
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What is the difference between how motor function is controlled in cerebrum vs frontal lobe?

At least according to wikipedia, the frontal lobe houses the primary motor cortex, but in a different article about the cerebellum, it says the cerebellum controls motor function. So, do both parts ...
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How can I verify my true genetic relationship with my close relatives with simple physical traits?

Question I don't know if it is ethical to ask a question like that, but I would like to know every simple physical trait that I can observe on me, my parents and my siblings which are regulated by a ...
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1answer
50 views

Is there human Anatomy software that provides great detail?

Is there Anatomy software that is exact representation of human body, like let's say virtual reality tour inside human body from head to foot, detailing all organs even small, covering all systems, ...
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56 views

Are there wounds which never completely heal?

I have a cut on a knuckle which occasionally opens (usually during winter), to disappear after some time (it is usually fine during the summer). This is going on for years now and yes, I will show ...
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Ingestion of cellulose digesting prokaryotes? [duplicate]

If humans digest cellulose digesting prokaryotes, can we start digesting cellulose like cows?
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1answer
501 views

HOW is the Gallbladder attached to the liver

The gallbladder’s function is to store bile from the liver which is delivered through the cystic (bile) duct. The cystic artery is also connected to the gallbladder to deliver blood. (Correct me if ...
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1answer
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Why can't we move our toes and some fingers separately? [duplicate]

In our feet, other than the large toe, the other toes cannot be moved separately. If we try to move them, then all the four toes move together. We cannot move each toe by itself. Same thing occurs in ...
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Why do we have only one elbow per arm and one knee per leg, not multiple elbows or knees? [closed]

I was surfing on the internet for a long time, but I couldn't find the answer to my question: Why do we have only one elbow per arm and one knee per leg, not multiple elbows or multiple knees per limb?...
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1answer
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Do women tend to have longer legs and shorter torsos than men?

I've always heard that women tend to have a greater leg length to torso length ration than men, and I think that my anecdotal observations of pedestrians of both sexes tend to confirm that. However, ...
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1answer
66 views

Why is the head/neck of the femur at that 120-150 degree angle?

I'm just wondering why the femur is such that there is that head and neck sticking out of the top at an angle, why it isn't just straight up into the hips?
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1answer
467 views

Humans have tails? [duplicate]

Today in biology class, my teacher said that all chordates have all the necessary traits, at least during the embryo stage, and we humans are chordates. So, one of these necessary traits was that they ...
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1answer
480 views

What is the “male gender rudiment” that women allegedly have?

In The Man without Qualities Robert Musil wrote (my emphasis): "But the nature," he thought, "gives the man nipples and the woman a male gender rudiment. We cannot conclude from this, however, ...
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Human spine: Is the coccyx really fused?

Prologue: This post is about the adult (say, a 20 year old) human skeleton; I'm not particularly interested in infant skeletons. The human spine has is composed of cervical, thoracic, lumbar, sacral ...
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1answer
57 views

What happens to the language processing brain part if no language is ever learned?

Language is processed in the human brain in multiple regions. Some of them seem to be used exclusively or mainly for language processing, other regions are distributed overlapping with other functions....
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Can you tell if a corpse was male or female by only examining its skull?

There are articles that says women have more rounded corner faces than men, than women noses are usually shorter, etc. But are those (and other features) tendencies or deterministic features that ...
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Ipsilateral vs contralateral side of body

I know that the dorsal columns carry ipsilateral information. Is this fact relative to the dorsal column in question? If I want to talk about the right dorsal column, then the right side of the body ...
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0answers
520 views

Strongest bone in body

AS internet tells is it is thigh bone which is strongest, but why, it carry only upper part of body, does not heel or any foot bones should be strongest in body as they carry full body weight ?
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1answer
550 views

Are centrioles really absent in human neurons?

A booklet (issued by my school) claims, Centrioles, formerly believed to be absent in neurons, have been described in neurons and may be associated with the production and maintenance of neuro(...
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1answer
207 views

How does kissing burst a person's ear drum?

A young Chinese woman was left partially deaf following a passionate kiss from her boyfriend. .. The kiss reduced pressure in the mouth, pulled the eardrum out and caused the breakdown of the ear. ...
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0answers
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Are there nerve endings on or inside the corpus cavernosum/spongiosum? [duplicate]

The penile skin has many nerve endings, but what about the inner structure of the penis? There are two dorsal nerves on either cavernosum. But it is unknown whether these nerves provide sensitivity ...
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Muscle involved in carrying load on head

I have seen people carrying heavy load on their head especially in 3rd world countries, does carrying on head any benefit or harm, which muscle get strengthen in doing it?
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1answer
635 views

What is the function of the Hyoepiglottic ligament?

The hyoepiglottic ligament (ligamentum hyoepiglotticum) is an elastic band that connects the epiglottis to the hyoid bone. Although I can find information about the clinical significance of this ...
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Alpha-gamma co-activation

I am having trouble visualizing/grasping the necessity of alpha-gamma co-activation. My understanding is the following: When an external load causes stretching of the sensory muscle spindles, the 1a ...
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0answers
27 views

Can you confirm the function of adipose tissue in the skin

Is it only to insulate and protect Organs. I wrote this (obviously in more detail) but my lecturer said that I need to write about the function in the skin, isn’t this it though. I’ve tried to do some ...
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1answer
150 views

Are there certain symmetric-pair muscles that are slightly bigger and NOT due to handedness?

Ok, hear me out, I was just thinking about an article in Nature I read in the past titled "Scrotal asymmetry in man and in ancient sculpture"$^{\dagger}$ and more recently an entire medical textbook ...
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What causes the blue color seen in baboons?

Based off of this question from Worldbuilding SE. In that question, I talked about how the scrotum and buttocks of various animals have a blue color because of thick deposits of collagen in those ...
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2answers
300 views

Why does the amount of adipose tissue contribute the most to the total body water amount in humans?

I don't quite get this concept. An obese individual will have a greater fat content in their body, and thus will have 45% water in their bodies (for example), versus a slim person that will have 75% ...
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1answer
92 views

Is the cranial nerve blood supply encapsulated by the blood brain barrier?

I understand the origin of cranial nerves are within the blood brain barrier. I'm assuming as they extend distally there's a point at which their vasculature is not encapsulated by the blood brain ...
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2answers
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Terminology for parts of the leg

Going out on a limb here (pun intended)...I'm writing a paper in which I need to refer to various sections of the human leg from upper thigh to knee to calf and ankle. However, "calf" covers a fairly ...
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What is the difference between the otolith membrane and the endolymph?

The human vestibular system contains otoliths to sense acceleration in the vertical and horizontal plane. I cannot find what the difference is between the otolith membrane and the endolymph? Can ...
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Is there any evolutionary significance of downward facing nostrils in human beings?

The nostrils in apes and monkeys are almost at the front, but in humans nostrils (external nares) face downwards. Also a lot of non-primate mammals like goats have nostrils at the front. Is it the ...
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1answer
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Where in the digestive tract are melatonin pills dissolved? Same question for gelatin capsules

I want to do a blind controlled experiment on myself to learn whether melatonin pills have any effects on me. I bought some empty gelatin capsules. I am going to fill some of them with rice and put ...
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2answers
219 views

Use of progesterone in preventing ovulation?

I have heard that progesterone in contraceptive pills or interuterine devices have been known to prevent ovulation. How is this possible since the LH and FSH are only affected by oestrogen not ...
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Is it possible for a man to survive around 20 bullets? [closed]

A man was shown being able to survive after around 20 bullets shot him in a movie. The bullet cover was fairly random, but anyway, is there any possible way for a person to survive 20 bullet shots? I'...
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Is the shape of the skull important for brain size?

I do not know biology, but I notice that human skull have a particular form that is like a upward spike and other skulls which are only oval. upward spike: oval: I know that in the example images ...
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108 views

What are the most efficient heat exchange sites on the human body?

Where on the body would be the best place to achieve the greatest cooling effect with a "cooling undergarment"? Concentrated over the kidneys, groin, inside the wrists, back of the neck?
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DNA Dead skin cells

If the stratum corneum is anucleated, dead cells - how is it that we are able to get DNA from buccal cheek swabs? Are we grabbing more than just the stratum corneum with the swab (eg. the underlying ...