What is Human body: Definition and 132 Discussions

The human body is the structure of a human being. It is composed of many different types of cells that together create tissues and subsequently organ systems. They ensure homeostasis and the viability of the human body.
It comprises a head, neck, trunk (which includes the thorax and abdomen), arms and hands, legs and feet.
The study of the human body involves anatomy, physiology, histology and embryology. The body varies anatomically in known ways. Physiology focuses on the systems and organs of the human body and their functions. Many systems and mechanisms interact in order to maintain homeostasis, with safe levels of substances such as sugar and oxygen in the blood.
The body is studied by health professionals, physiologists, anatomists, and by artists to assist them in their work.

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  1. Keith

    Question about space travel and the human body

    Hello I have a question that's been bothering me for a while now and I figured I'd post it here to see if anyone could put my mind at ease. (Sorry if I accidentally posted this in the wrong place) Given that people can only withstand a certain amount of force on their bodies (about 5 Gs)...
  2. davgonz90

    Can The Human Body Be Expressed Mathematically?

    I have a question: can the human body be expressed mathematically? If so, how would you even go about starting to map out the algorithmic structure of something that's living (which would include molecular function, cellular function, etc. etc.)?
  3. Q

    Capacitance between human body and ground

    Why does a voltage tester (that looks like a screwdriver) turn on even when you are "heavily" insulated from the ground e.g. sitting on a wooden chair. Is it the result of capacitance between the human body and the ground? (i.e. the body and the ground act as conductors, whereas the insulated...
  4. fluidistic

    Using calories of food (as a human body), several questions

    Hello, I would like to understand what exactly is meant by "calories" when we read for example that a chocolate bar has 300 kcal. I understand what is a (kilo)calorie. What I do not know is whether the written values are the raw values in calories or if they are the values our body can...
  5. A

    Questions about entropy, normal force, and the human body

    Greetings folks, I'm new to this forum and to physics in general so apologies if I come off like a greenhorn or if I am posting these questions in the wrong place. I have an Arts background and have never really "gotten" science, but my interest in post-Enlightenment philosophy has led me to a...
  6. K

    What would happen to a human body exposed to space without a spacesuit?

    I always wonder about our human body in space without any suits. I don't know exactly what happens but i want to know which has been a interesting question to me right from my past. What will happen when a human body is exposed to space without any space suits?
  7. Superposed_Cat

    Percentage water human body 90? 70? 53?

    Hi, every time I hear any website/TV program/person mention the percentage water composition of the human body it varies tremendously. 90,80,85,70,53. What is it? any help appreciated. Thanks
  8. B

    Why Do Some People Conduct Electricity and Others Don't?

    I wasn't sure whether to post this question in biology or physics. I'm stumped on a couple experiments. Here are the basic experiments. I have people wash their hands and dry them off and then hold onto the probes of a volt meter. To my surprise some people give a reading as high as...
  9. M

    Which elements of the human body are found elsewhere?

    Carbon (18%) Hydrogen (10%) Nitrogen (3%) Calcium (1.5%) Phosphorus (1.0%) Potassium (0.35%) Sulfur (0.25%) Sodium (0.15%) Magnesium (0.05%) Copper, Zinc, Selenium, Molybdenum, Fluorine, Chlorine, Iodine, Manganese, Cobalt, Iron (0.70%) Lithium, Strontium, Aluminum, Silicon, Lead...
  10. J

    Maxwell 3D - DC analysis on Human Body

    Hi, I am using a Human body model which I built for some simulation studies. I was trying to pass DC current through the Human body and though my Project completed the simulation successfully I got the below warning message. Can anyone please help me interpret it? The error log is as...
  11. E

    Are there multiple pressures within the human body?

    I recently learned about the pressure of the atmosphere against the human body. It just so happens that this force is in equilibrium with the human body, so we do not feel any pressure. Although if we fly an airplane, we do. This got me to thinking, what of the blood in our veins? Does...
  12. I

    Electric current in the human body

    You mostly hear about electrons as being the vehicle of an electric current because we think of wires and metal. However, if an electric current traveled through the human body, it would be in the form of ions, right? But what happens at the interface between body and wire? I am guessing that...
  13. S

    Resonant frequency of a human body

    Does anyone know why the resonant frequency of a grounded human is smaller when ungrounded?
  14. C

    Problem involving the human body and rate of heat transfer

    Homework Statement If you lie on the ground at night with no cover, you get cold rather quickly. Much of this is due to energy loss by radiation. At night in a dry climate, the temperature of the sky can drop to -40°C. If you are lying on the ground with thin clothing that provides little...
  15. M

    The Physics Behind a Bullet Hitting The Human Body

    Ok so I'm trying to show how a bullet in real life will not actually make a person fly backwards like it does in movies. I have some idea of how to go about this but need help. So far... I know it's a perfectly inelastic collision since the bullet sticks into the person so would I have to use...
  16. J

    G-Forces in Space and the Human Body

    Having an infuriating time trying to explain physics to co works. The debate is as follows: to get to Pluto in a quick time, say less than a year, you would have to travel extremely fast. If it were possible to reach such a speed via rockets/ion drive the human body would be crushed under the...
  17. C

    How does gravity affect the human body in different positions?

    Homework Statement i measured myself before going to sleep and after waking up over several nights and found out I'm ~1.5cm taller in the morning then at night. I know this question is related to human biology, but I'm equally (if not more so) interested in the physics behind the problem i.e...
  18. M

    All bones in human body are equal in strength.

    Why does many sites always said the femur is the strongest and heaviest bone in the human body? I know the femur is the longest bone, but is it really that the femur is the strongest and heaviest bone in human body? This is a link where it is said that human femur and humerus are nearly equal in...
  19. T

    Is the electric field in the human body zero?

    According to Gauss, a closed conducting body will distribute the charge to the surface. Since the human body is a conductor does that mean the electric field in our body is zero? :cool:
  20. B

    Surviving Space: The Impact of Hemoglobin Levels on Human Body in a Vacuum

    Would someone with a disorder that results in the inability to carry the total of 4 hemoglobin per RBC survive longer in space without a suit (even if just a fraction of a second) than someone with 100% hemoglobin carrying potential due to their decreased O2 level?
  21. Q

    (21-23) thermodynamics problem. Finding efficiency for the human body

    Homework Statement While running up stairs at a (vertical) rate of 0.30 m/s, a man of 70 kg generates waste heat at a rate of 1300 J/s. What efficiency for the human body can you deduce from this? Homework Equations efficiency of heat...
  22. C

    The potential effects of Potassium chlorate on the human body.

    The potential effects of "Potassium chlorate" on the human body. To the many distinguished members of the chemistry field, I am a U.S. Army EOD (explosive ordnance disposal) Tech who returned from Afghanistan about 3 months ago. During my deployment I was forced to manually enter an IED...
  23. Loren Booda

    Medical Has infrasound been used to image the human body?

    Is it possible to scan humans with ultra low frequencies to study medically one's physique?
  24. F

    Which would do more damage to a human body, and which would you choose?

    Let's say you are given a choice of being hit by one of two objects, both going at 50 miles Per hour ( about 80 Km per hour). One is a ten pound (3.5 kg) traffic cone made of rubber. The other is a standard baseball which weighs at around 5oz, which is less than half a pound or about a fifth of...
  25. M

    What are the steps for analyzing static loads on the human body?

    Hii guys :smile: here something tricky, have a go on this one... I am required to model the human body so that I can analyse the static loads, (comparing the pilates position and the abdominal sit-up position) (pictures...
  26. M

    Which Exercise Requires More Abdominal Effort: Pilates or Sit-Ups?

    This question requires you to model the human body so that you can analyse the static loads, (comparing the pilates position and the abdominal sit-up position, figure above) Using the body mass ‘M’ of 94 kg and a body height ‘h’ of 1.73 metres, establish which exercise requires the most effort...
  27. D

    Human body grounding a charged object

    In a very good book, Chabay and Sherwood explain that when an initially uncharged person touches a negatively charged metal object, free electrons from the metal neutralize some Na+ ions in the salty layer on the person's skin. The person then becomes negatively charged and the neutral Na atoms...
  28. 5

    Leverage & Human Body: Exploring Advantages of Shorter Arms

    Hi guys/gals, I had a couple random questions on leverage and the human body. I am an active individual that enjoys lifting weights and working out. At the gym today, I got to thinking about the "mechanical advantages" that certain body types have doing particular lifts. First question...
  29. V

    Algebraic Thermodynamics - Power absorbed and emitted by human body

    Homework Statement Problem 1 The emissivity of the human skin is 97.0 percent. Use 35.0 °C for the skin temperature and approximate the human body by a rectangular block with a height of 1.97 m, a width of 41.0 cm and a length of 34.5 cm. a) Calculate the power emitted by the human body...
  30. V

    Human body and static electricity

    Scenario: If a human body is fully charged with positive electrons (protons/lack of electrons) and comes in contact with a pool of positive electrons such as a charged plate, the charge stays the same in the human body and the plate. Now if the human comes in contact with a source of negative...
  31. R

    Human Body Resonant Frequencies

    Since the old topic is locked, I had to post a new one about this (old topic here: https://www.physicsforums.com/archive/index.php/t-231156.html" ) People were talking about resonant frequencies for body parts and/or the entire body and someone was looking for a chart, not sure if this is...
  32. C

    Atoms contained in a human body

    Given two people of different complexion, one short and chubby and the other one tall and thin, but same weight (180 lbs each): a> Do they have the same number of atoms in their bodies b> If not, will the percent difference be significant? c>Is there a way to know an estimate of this...
  33. S

    Medical What voltage is normal for a human body?

    Does anyone know what is normal voltage for a young, physically healthy human male? If you take a usual voltmeter and will ground the negative end how many millivolts do you suppose to read by touching dry human skin with the positive end? Is there suppose to be some difference between skin on...
  34. B

    Gallium spoons - how does the human body metabolize gallium?

    hi there, i came across this video https://www.youtube.com/watch?v=kIbYiO5BRYk http://www.youtube.com/watch?v=kIbYiO5BRYk, and before I buy the set I'd like to know how the human body metabolized gallium metal/ions. I've read quite extensively on gallium metal, but I can't find much info on how...
  35. F

    High-voltage low-amperage current through the human body

    I=V/R, so the amperage is determined by the voltage and the resistance of the human body, right? But yet it is possible to have a high voltage but low amperage current go through you, say you grabbing 2 electrodes which have the a high voltage between them. How come the amperage is low and...
  36. n.karthick

    Which organ of human body has longest life

    Hi, I am not biology student and I want to know this In our body, which organ can live for long time and how long it can live? also which is the organ with shortest life? Nowadays people talk about donating eyes, kidneys after their death. So I got this doubt, that whether these organs are...
  37. S

    Human body Physics 2020 question

    Homework Statement If a person breathes 10 liters per minute or air at 68 deg(F) and 50% relative humidity, how much water per day must the internal membranes supply to saturate the air at 98.6 Deg(F) (Assume all moisture is exhaled) If each gram of water extracts 580 calories as it is...
  38. S

    Effects of high and low pressure on the human body.

    Homework Statement I was asked by my lab teacher to investigate the effects on the human body of being exposed to very high and very low pressures, and while I have found some good sources of info it is not that easy to find good and quotable sources, I was wondering if anyone could offer some...
  39. K

    Combining nonlinear dynamics with the human body?

    Hi, I am a physics student who just finished his bachelor thesis in nonlinear dynamics. I am about to start the physics master programme at my home university (in Germany). Within a year, I will have to start writing my master thesis, so I'm trying to figure out in which domain I want to work...
  40. L

    What is the minimum pressure the human body can handle?

    ...assuming very slow adaptation is possible. How low can one go? And something else: if you're at very low pressure, water or blood would boil at RT (pressure is lower than the vapor pressure of water). Would this mean a relatively innocent cut wound would make you lose a lot of blood? The...
  41. K

    Equilibrium in the Human Body using Torque

    In the movie Terminator, Arnold Schwarzenegger lifts someone up by the neck and, with both arms fully extended and horizontal, holds the person off the ground. If the person being held weighs 650 N, is 60 cm from the shoulder joint, and Arnold has an anatomy analogous to that in the figure...
  42. S

    Equations for Human Body Movement: Can Anyone Help?

    please can anyone help me to figure out the equations of human body movement ( walk ) I am in need so badly .. Best Wishes
  43. D

    When and why did human body censorship begin?

    From the breasts to the genitals, when did humans want to start covering themselves (not for protection), and what made them ashamed of their body? No bible jokes please.
  44. C

    Medical Water content of the human body

    I was wondering how the total amount of water in a typical human varies by weight and sex. I saw a site claiming that the typical male/female water percentages by mass were 62% for men and 51% for women; fair enough, though I've seen higher figures. (I'm more concerned with the ratio between...
  45. J

    Kinetic Energy and the Power of Human Climbing

    How to calculate the height of a person climbs from the third stair up? i don'[y know how to calculate it. HELP! I have the mass=68kg, individual step height=0.16m, number of steps in flight=12 additional question: calculate the average power each person exerted while climbed the stairs...
  46. F

    Is it safe to use electricity on the human body for muscle reflex studies?

    Hello, I want to build a circuit that can put about 350 microA in my body(to study muscle reflexes etc.). Until now I've come to the conclusion that I need DC in order to get a definite direction of the current. Can anyone help me in figuring out what kind of AC/DC transformer and what output...
  47. B

    Cooling the human body with fans.

    Hi, I'm a cyclist who has just got some rollers, which allow me to ride inside without going anywhere - essential if I want to ride on harsh winter days. The problem is, without the cooling airflow normally experienced when out on the road, heat exhaustion makes long periods of indoor training...
  48. L

    What air pressure can the human body survive?

    How much air pressure could a human survive in?
  49. M

    Why does electrical current passing through the human body hurt?

    What's the electrical current messing up that's causing pain?
  50. R

    What is the Maximum Amount of Chemical Energy Stored in a Human Body?

    I only have a basic knowledge biology, but I've wondered about this before. From a "fully charged" adult male human to dying of lack of nourishment; in case of chemical energy from food, this is often said to be three weeks. If it takes that long for a human to lose energy, how much is...
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