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Something I found: Jeffrey S. Dover,Clinical Associate Professor of Medicine at Yale University,said the exact reason for fingernails and toenails growth factor defference is still unclear. However, the growth rate of fingernails is indeed nearly 3 times to toenails'. Dover said that when the nails grow old, their growth rate may be slightly slower, but ...


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This doesn't really answer the question and I only post it at the asker's request. NASA has measured the dimensions of the back in 40 year old American males and 40 year old Japanese females in the year 2000 at 1G. Of course gravity matters to NASA… From figure 3.3.1.3-1 (American male). All data in centimetres: 921 Waist back 5th percentile: 43.7 ...


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Yes, as long as the person is able to blow air and 'shape' it using their tongue+lips, a person can whistle; even if it means this person lacks the ability to create the vibrational patterns necessary to talk.


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Short answer Given your comments you are referring to the cause of fainting after being triggered by certain stressors. The reason is a sudden drop in blood pressure due to parasympathetic nervous system activation (vagus nerve activity). This leads to reduced blood flow to your brain, which results in a brief loss of consciousness (Mayo Clinic). Background ...


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It seems that speech can be recovered after total glossectomy, although it's not a short or an easy process. Here's one case: a case study, reporting the evaluation and evolution findings of the speech-language pathology rehabilitation of the swallowing and speech functions of a 58-year-old man submitted to total glossectomy in June 2009. After ...


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You can whisper without a larynx. "Patients who have undergone partial or full laryngectomy are typically unable to speak anything more than hoarse whispers, without the aid of prostheses or specialized speaking techniques." (source) So the remainder of the vocal tract is capable of enough modulation to present typical human speech in many languages. I ...


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Speech is generated by generating a frequency spectrum with the vocal folds, and then filtering it with the upper vocal tract. Whistling is done by blowing air over shaped tongue and lips. So, give someone a laryngectomy. They still retain the upper vocal tract (and so can still whistle), but they cannot generate the source vibrations to speak. Do it as ...


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Short answer(s) Someone with a damaged larynx may still speak with the use of a speech aid (electronic larynx). The ability to understand speech does not necessarily mean one can speak normally. There are neurological disorders where folks can understand speech, but have difficulty producing it. Background A full removal of the larynx (laryngectomy) ...


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The muscle spindle normally stretches/contracts in concert with the muscle fibres in order to maintain detection of changes in length. This image should demonstrate it clearly: When the muscle spindle is stretched and excited it sends impulses to the spinal cord more rapidly (increased frequency). The sensory neurons synapse with alpha motor neurons ...


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Sounds such as certain phonemes are made merely with the use of air flow and movement of the lips or tongue, without the need for action of the vocal chords. Think of 'f', 's', 't', k in the English language. These are called unvoiced phonemes in phoniatrics (see the phonemic chart). Also, clicking sounds and whistling can be made without use of the vocal ...


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Citing your source would help to answer. In order to test an elastic modulus, you need to apply some non-zero strain. If the strain is infinitesimal, then compression and stretch modulus will be equal. But if it is finite, then there can be a difference due to the structure of the material. In bone, I believe porosity will provide most of the dissymetry ...


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Anatomical terms must be able to fit a wide variety of organisms, from insects to fish, dogs, horses, chimpanzees to humans. That's why the terms are sometimes confusing to people who are thinking only of bipedal humans. In anatomy, the dorsum is the upper side of animals that typically run fly, swim or crawl in a horizontal position. In vertebrates the ...


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Dors/dorsum in Latin simply means "back", and it is rather normal and reasonable to use the equivalent term in English with regard to the extremities (hands and feet), see "back of my hand". It is medical convention to refer to the non-gripping surfaces of the feet and hands, as well as the upper (towards the brain) surface of the tongue as "dorsal". My ...


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The lines on the hand are known as flexion creases, and they exist because in their absence, the skin will stretch outwards when the palm is closed due to the decreased surface area of the closed palm, causing problems with gripping. Developmental disorders such as Down Syndrome often cause there to be only one palm line, known as the simian crease, as ...


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Interesting question. Here what I think (I am not an expert in congenital analgesia so take it with a grain of salt). The pain provoked by an high temperature is mainly transmitted via the receptor TRPV1 (a Ca2+-channel nocireceptor) while cold sensation is driven by TRPM8 and possibly, for noxious cold, via TRPA1 (two similar types of Ca2+-channels). Those ...



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