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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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Does human skeletal muscle fascia grow new additional collagen in response to increases in skeletal muscle size?

For example, if a human skeletal muscle is growing repeatedly due to periodic weightlifting, does the fascia eventually respond to the increasing volume by growing more quantities of collagen or other ...
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0answers
167 views

What is the lifespan of a human skeletal muscle cell (such as in the biceps)?

I have read that most human skeletal muscles (such as those in the biceps) cannot multiply after development (except for exceptional situations of severe damage that involve satellite cells) and that ...
3
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0answers
301 views

Why do hair on head not get pilo-erected?

Whenever we have "goosebumps", there is a momentary piloerection, due to which hair on our elbows and legs get "erected" and "stand" almost perpendicular to the surface of our skin. But why do our "...
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0answers
334 views

Does the humeroradial joint move medially/laterally?

The humeroradial joint is a ball-and-socket joint that, if unrestricted, would allow for movement around all possible axes. However (as succinctly stated from Wikipedia): the annular ligament, by ...
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1answer
76 views

Is there a map of the individual motor axons in the limbs?

As of right now, I can only find a map of nerve fibers, but not necessarily the individual neuron axons. For example, here's a map of the nerves in the arm and hand. http://www.innerbody.com/anatomy/...
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73 views

Changes in spongy urethra during tumescence

How does the columnar cells of spongy urethra expand during tumescence(erection of penis)? If we assume that the urethra has the length, long enough to sustain tumescence without expansion of cells, ...
13
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2answers
4k views

Using anatomical terms for human organs and parts of plants

I know how to apply anatomical directional terms (e.g., dorsal/ventral, anterior/posterior, etc.) for animals as a whole (bipeds and quadrupeds). Recently, I've been studying plant physiology, and I ...
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0answers
68 views

What makes delayed onset muscle soreness stop occurring?

If someone lifts weights or takes a long jog after not doing it for a while, they can experience delayed onset muscle soreness (DOMS). However, when they return to the same exercise days afterwards, ...
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0answers
62 views

Thyroid transplanted to the abdomen

This question was posed in our endocrinology class, however I have no idea how to answer it: The thyroid gland of a 5-year old boy is transplanted from its normal position in the neck to the ...
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2answers
701 views

Why metacarpus is considered hand proper?

This textbook states The hand (or manus) consists of the following parts: (a) wrist or carpus, (b) hand proper (or metacarpus), and (c) digits (thumb and fingers). How could I justify why are ...
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0answers
179 views

How can skeletal muscles in the human body be modeled as levers? [closed]

From what I understand, human arms can be thought of as third class levers, so that the distance from your elbow to the place where the muscle attaches is effectively the distance to the fulcrum, so ...
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1answer
53k views

Dorsal vs Posterior and Ventral vs Anterior

From prior reading, I thought that Dorsal is the same as Posterior and Ventral is the same as Anterior. However, when I checked in google images for these anatomical terms for a horse (just to ...
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1answer
82 views

If a fully functional lab grown pancreas can exist, can it be used as a cure for type 2 diabetes?

Is it approximately equivalent to say that if a fully functional lab grown pancreas exists, then a way to cure Type 2 diabetes could soon exist? Recently I've already checked out that only the ...
5
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2answers
3k views

What is the purpose of the incus?

The three bones in the middle ear -- the malleus, the incus, and the stapes-- play a role in transmitting sound waves to the inner ear (the cochlea). I understand that the malleus is the bone closest ...
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2answers
514 views

Can the human chin have developed to protect against combat strangles?

Has the mechanical explanation of headlock defense ever been discussed by scientists to explain the chin(protuberantia mentalis)? A mechanical advantage that prevents death and being beaten up by ...
2
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1answer
456 views

Why hand washing causes skin to dry?

This seems counter intuitive: dry hands mean low humidity, so why when humidity is increased, by washing hands, they become even more dry, eventually? In particular, why such hand dryness is usually ...
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1answer
1k views

Common site for atherosclerosis

My book( textbook of anatomy abdomen and lower limb 2nd edition - by vishram Singh pg.no:286) says: Acute arterial occlusion: It is mostly caused by embolism or thrombosis. It usually occurs in the ...
3
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1answer
654 views

What are some characteristics of venules and arterioles?

I know that the vascular system of the human body is organized in the two, "ever branching", structures of the veins and the arteries. These two structures stem from their connections to the heart and ...
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1answer
75 views

Is it possible to completely puncture a human hand and have no blood come out?

Illusionist David Blaine sometimes performs a trick where he takes a very long and thin ice pick, insterts it in his hand, and comes out the other side (the palm). However, there is no blood present. ...
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2answers
11k views

What's inside the males body in the space where females have the ovaries and the uterus?

The male penis and scrotum are external extremities, whereas the female sex organs are placed "inside" the body. So as females have the bladder, rectum, other stuff just like males. Does this mean ...
1
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1answer
13k views

Why do we have the tibia and fibula (a 2nd bone) in the lower leg?

Does fibula participate in rotational movement of ankle or not (just like the radius in forearm)? If not, what is the purpose of that bone?
2
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0answers
132 views

Left Ventricle vs. Right Ventricle size in different Animals [closed]

Why are the right ventricles in chicken hearts significantly smaller than the left ventricles, whereas in cows the two ventricles are of roughly equal size.
2
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1answer
5k views

Surgical vs anatomical neck

What is the significance of differentiating anatomical neck and surgical neck of a bone? What could be criterias for differentiation? I found an article here that says fractures to surgical neck ...
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0answers
42 views

On Deformation of the body due to dipole orientation in the cells [closed]

Our bodies are made up of billions of atoms and molecules, and each cell has many molecules with dipoles that are initially random and orient themselves in one specific direction when an electric ...
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1answer
260 views

Why does the term “epicondyle” often refer to either of the two at the elbow end of the humerus?

Why does the term "epicondyle" often refer to either of the two at the elbow end of the humerus? Example: I understand that epicondyle means near a condyle, but there are several condyles in the ...
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2answers
673 views

Could a man be proved positive for a pregnancy test?

From the question: Could a man be proved positive for a pregnancy test?. I don't mean if a man could be pregnant but if he runs a pregnancy test, it is possible for it to come out positive?
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1answer
3k views

What is the rest state for eyelids - Open or Closed?

If one were to not apply any efforts on the eyelid muscles, will they remain open or closed? In movies when we see a person die, either case could happen - their eyelids could be open or closed when ...
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1answer
632 views

Determining bicep tendon insertion point

I was unable to find a source that could provide a measurement for the distance between the insertion of the distal end of the bicep tendon and the head of the radius. Does anyone know a source that ...
4
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1answer
2k views

8 abdominal muscles but 10 pack

Simple question, how is it possible that there are people who appear to have 10 pack abdominal muscles while the human body has only eight?
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0answers
421 views

confusion regarding degrees of flexion and a goniometer

I have read https://en.wikipedia.org/wiki/Anatomical_terms_of_motion#Flexion_and_extension "Flexion ... decreases the angle...Extension is the opposite of flexion, describing a straightening ...
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0answers
35 views

Are the human placenta chorionic villi and villous tree the synonyms?

Are the human placental chorionic villi and the villous tree the synonyms? Or, if not, can I say that these tissues would have practically the same gene expression profile in an RNA microarray ...
1
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1answer
468 views

Does the anterior primary ramus of T6 innvervate the Rectus abdominis?

Anatomy and Human Movement Structure and Function writes in the section about Rectus abdominis: Nerve supply By the anterior primary rami of the lower six or seven thoracic nerves (T6/7 to T12)....
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4answers
33k views

What makes humans omnivores, and not herbivores?

Some vegans claim that humans are herbivores, not omnivores, and that we are not physiologically designed to eat meat (see here: http://www.peta.org/living/food/natural-human-diet/). "According to ...
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0answers
45 views

How deep does a 0.5mm radius drill need to drill before it start to hurt the brain assuming the drill bit will be pull off without wiggle?

How deep does a 0.5mm radius drill into the brain need to drill before it start to hurt the brain permanently assuming the drill bit will be pull off without wiggle? I am assessing how fragile of a ...
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1answer
57 views

How correlated are the lengths of tendons in different part of a human body?

How correlated are the lengths of tendons in different part of a human body? E.g., if the we consider two humans, A, and B. Human A has a patellar tendon of length 2 cm, and human B has a patellar ...
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0answers
253 views

Anatomical Angle Made by the Fingers of an Extended Palm

Does the angle made by the fingers (excluding the thumb) of an extended palm (as shown in the figure below) have a name (such as the Lovibond or Cobb angle, for instance) ? I have already checked ...
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2answers
751 views

How does air pass through when we breathe through the mouth?

When you sleep with your mouth open, does air pass through the nasal cavities? If not, how will you describe the air that enters the mouth?
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1answer
314 views

What technique biologists use in order to determine the function of organs? [closed]

How the biologists were able to determine the functions of body organs? Using a specific example organ for an answer would be ideal.
2
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1answer
109 views

How far does your center of mass move from stance to stance?

When the human body is perfectly centered, the center of mass is on the centerline around the belly button. However, the human body is not always in this rigid posture. We have many postures that we ...
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1answer
4k views

Amount of blunt force to kill a person [closed]

In short, if I were to whack someone over the head, what factors play a role in whether the victim survives? Force? Pressure? Location? Something else?
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5answers
8k views

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 ...
3
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1answer
677 views

How are some people able to continue growing after reaching maturity?

This is technically a cross-post of a question posted last year concerning gigantism and how certain people are able to grow far past expectations after it's assumed they've reached maturity. How are ...
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1answer
92 views

Accommodation mechanism. [closed]

Can anyone explain how contraction of the ciliary muscles causes relaxation of the zonules? Please explain it anatomically i.e. the attachments of ciliary muscles and its relation with the ...
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1answer
13k views

Do male humans have a mons pubis?

Wikipedia writes: In human anatomy, and in mammals in general, the mons pubis (also known simply as the mons, and known specifically in females as the mons Venus or mons veneris), is a rounded mass ...
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0answers
1k views

Do any non-human species have packed abs?

The classic "six-pack abs" in humans is due to tendons stretched across the abdominal muscles and low body fat. Do any other animals have a similar arrangement of tendons that could result in visible "...
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0answers
217 views

Would a transparent iris serve its purpose?

The function of the iris is to regulate the aperture of the pupil. How does the iris obstruct light? Is it due to the pigment present in it? Or is it just due to the sheer presence of it? I am doing ...
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3answers
4k views

Why are the human knees and elbows bent in an opposite direction

I can assume that the hands used to be the same as legs. And they got weaken, and changed direction when human started to walk on two? Also why do the hand palms facing the body and not facing down ...
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1answer
1k views

Is it necessary to remove a bullet from the body? [closed]

So here is the proof: William Lawis Pace lived with bullet in his head for many years & even hit 100. However, both in real life and movies, we often see doctors struggling to remove bullets ...
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1answer
7k views

Can defibrillation be done with a car battery?

Can successful defibrillation be done with a car battery? Is it POSSIBLE for this to work? Let's say you are stuck on a very remote place and something happens to someone... Moreover, can you jump ...
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1answer
2k views

What actually happens to the human body during fasting/starvation? [closed]

I recently came across a UN study which advocated that controlled fasting can be beneficial for the the human body and I am fascinated by stories of wilderness survival against the odds. It piqued ...