PHYSICS OF THE HUMAN BODY PDF
Physics of the Human Body comprehensively addresses the physical and Pages PDF · Fluid Pressure, Fluid Flow in the Body, and Motion in Fluids. 2 Statics of the Body. Review of Forces, Torques, and Equilibrium. Statics: Motion in One Plane and Levers. Statics in the Body. In a similar vein, a text about physics and the human body could cover. “physics of the body, by the body, and for the body,” but perhaps that would be too broad.
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PDF | On Jan 1, , Manuel Vogel and others published Physics of the Human Body, by Richard P. McCall. Request PDF on ResearchGate | On Mar 1, , Jiri Janata and others published Physics of the Human Body. physics of the human body pdf herman pdf - Google Search.
All it seems to do is occasionally get infected and cause appendicitis. Yet recently it has been discovered that the appendix is very useful to the bacteria that help your digestive system function.
They use it to get respite from the strain of the frenzied activity of the gut, somewhere to breed and help keep the gut's bacterial inhabitants topped up. So treat your appendix with respect.
These vary in size from simple pairs of atoms, like an oxygen molecule, to complex organic structures. But the biggest molecule in nature resides in your body. A normal human cell has 23 pairs of chromosomes in its nucleus, each a single, very long, molecule of DNA. We aren't sure quite why we lost our protective fur.
It has been suggested that it may have been to help early humans sweat more easily, or to make life harder for parasites such as lice and ticks, or even because our ancestors were partly aquatic.
But perhaps the most attractive idea is that early humans needed to co-operate more when they moved out of the trees into the savanna. When animals are bred for co-operation, as we once did with wolves to produce dogs, they become more like their infants. In a fascinating year experiment starting in the s, Russian foxes were bred for docility.
Over the period, adult foxes become more and more like large cubs, spending more time playing, and developing drooping ears, floppy tails and patterned coats.
Humans similarly have some characteristics of infantile apes — large heads, small mouths and, significantly here, finer body hair. They occur when tiny muscles around the base of each hair tense, pulling the hair more erect. With a decent covering of fur, this would fluff up the coat, getting more air into it, making it a better insulator. But with a human's thin body hair, it just makes our skin look strange.
Physics of the Human Body
Similarly we get the bristling feeling of our hair standing on end when we are scared or experience an emotive memory. Many mammals fluff up their fur when threatened, to look bigger and so more dangerous. Humans used to have a similar defensive fluffing up of their body hairs, but once again, the effect is now ruined.
We still feel the sensation of hairs standing on end, but gain no visual bulk. But it's mostly fiction.
There would be some discomfort as the air inside the body expanded, but nothing like the exploding body parts Hollywood loves. Although liquids do boil in a vacuum, your blood is kept under pressure by your circulatory system and would be just fine. And although space is very cold, you would not lose heat particularly quickly. As Thermos flasks demonstrate, a vacuum is a great insulator.
In practice, the thing that will kill you in space is simply the lack of air. In a test subject's suit sprang a leak in a Nasa vacuum chamber.
The victim, who survived, remained conscious for around 14 seconds.
The exact survival limit isn't known, but would probably be one to two minutes. The nucleus that makes up the vast bulk of the matter in an atom is so much smaller than the whole structure that it is comparable to the size of a fly in a cathedral.
Neutron stars are made up of matter that has undergone exactly this kind of compression. In a single cubic centimetre of neutron star material there are around m tons of matter. An entire neutron star, heavier than our sun, occupies a sphere that is roughly the size across of the Isle of Wight.
The closer they get, the more repulsion there is between the electrical charges on their component parts. It's like trying to bring two intensely powerful magnets together, north pole to north pole. This even applies when objects appear to be in contact.
When you sit on a chair, you don't touch it. You float a tiny distance above, suspended by the repulsion between atoms. This electromagnetic force is vastly stronger than the force of gravity — around a billion billion billion billion times stronger. You can demonstrate the relative strength by holding a fridge magnet near a fridge and letting go.
The electromagnetic force from the tiny magnet overwhelms the gravitational attraction of the whole Earth.
Hydrogen, the most common element in the universe and a major feature of your body, was produced in the big bang Heavier atoms such as carbon and oxygen were forged in stars between 7bn and 12bn years ago, and blasted across space when the stars exploded.
Some of these explosions were so powerful that they also produced the elements heavier than iron, which stars can't construct. This means that the components of your body are truly ancient: you are stardust.
If you ask most people to draw a picture of one of the atoms in their bodies, they will produce something like a miniature solar system, with a nucleus as the sun and electrons whizzing round like planets. This was, indeed, an early model of the atom, but it was realised that such atoms would collapse in an instant. This is because electrons have an electrical charge and accelerating a charged particle, which is necessary to keep it in orbit, would make it give off energy in the form of light, leaving the electron spiralling into the nucleus.
In reality, electrons are confined to specific orbits, as if they ran on rails.
They can't exist anywhere between these orbits but have to make a "quantum leap" from one to another. What's more, as quantum particles, electrons exist as a collection of probabilities rather than at specific locations, so a better picture is to show the electrons as a set of fuzzy shells around the nucleus.
But the presence of the iron is a coincidence.
Physical Aspects of Organs and Imaging
The red colour arises because the iron is bound in a ring of atoms in haemoglobin called porphyrin and it's the shape of this structure that produces the colour. Just how red your haemoglobin is depends on whether there is oxygen bound to it. When there is oxygen present, it changes the shape of the porphyrin, giving the red blood cells a more vivid shade. Your DNA includes the genes from at least eight retroviruses. These are a kind of virus that makes use of the cell's mechanisms for coding DNA to take over a cell.
At some point in human history, these genes became incorporated into human DNA. There are problems at the end of each chapter; solutions to selected problems are also provided.
Mr. Wright's Online Classroom Resources
This text is geared to undergraduates interested in physics, medical applications of physics, quantitative physiology, medicine, and biomedical engineering. Skip to main content Skip to table of contents.
Physics of the Human Body. Terminology, the Standard Human, and Scaling.
Pages Statics of the Body. Mechanical Properties of the Body. Energy, Heat, Work, and Power of the Body. Cardiovascular System. Lungs and Breathing. Sound, Speech, and Hearing.Both iatrogenic and decompression-induced gas bubbles are considered.
Search Close. Students who find some of the words receive points based on the percentage they find. Herman 1 1. We aren't sure quite why we lost our protective fur.
General note: Textbook Keyword s: Our brains don't produce an image the way a video camera works.
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