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There are an estimated 100 billion neurons within the human brain. In general a minor variation in the number of neurons should not effect individuals too much, however when there is a more significant loss, such as brain injury or in some forms of dementia cognitive abilities do decline. So in this sense yes the number of neurons does relate to ...


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A mechanical stimulus can act on a tissue with elastic and viscoelastic properties in two ways [1, 2]: distort the cellular membrane which leads to opening of ion channels. create tension on the extracellular matrix or cytoskeleton, to which a ion channel is bound, thus leading to opening of the channel. Stretch-activated ion channels opening leads to ...


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I think that the advantages of using both hands with equal ease is quite evident whether it be sports, at your work or while you are doing your household chores. An obvious advantage is using both hands to write or draw with both at the same time. I would be focusing on the disadvantages that may be faced. 1) Ambidextrous people are more prone to ...


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Yes, but rarely. Other types of brain cells are much more likely to form tumors. Oligodendrocytes, astrocytes, and more generally glial cells all form tumors with some regularity. Nerve sheaths can also form benign growths. Nerves themselves can even manifest cancerous behavior, even though they are nearly always benign and very slow growing. ...


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In addition to what Spinoral has said, and in response to your comment above, I will add a bit more about the mechanisms. Essentially, in some form or another it's receptive fields all the way up. A brief outline of the anatomy: The cells from the spinal cord are pseudounipolar and have their cell bodies in the dorsal root ganglia in the spinal cord. The ...


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The accuracy of sensation is actually quite variable depending on the region of our body. Highly innervated areas such as our fingers have a higher degree of accuracy than sparsely innervated areas such as our legs. There is a simple experiment you can do to illustrate this. Close your eyes and then get a friend to lightly and slowly run their finger from ...


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I am not sure I fully understand your question, it's a little unclear. But if I understand the question correctly it is how to we coordinate movement on both sides of the body? Well this can occur because we have connections between both hemispheres of the brain. The major connection is called the corpus collosum, this is a white matter tract that allows ...


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It would be better to say that they go into an inactive, low metabolic state. This low metabolic state is often driven by the temperature in the air itself; ectothermic butterflies require outside heat-energy to become active. Basically they use this time to digest their food and produce sperm/eggs. (reference). At night, or during inclement weather, most ...


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What is the mechanism of antiperistalsis that occurs during vomiting? Emetic agents in the bloodstream stimulate chemoreceptors in area postrema and nucleus tractus solitarius [1]. Nucleus tractus solitarius is connected to motor neurons in ventral medulla and hypothalamus [1]. Esophageal and gastric peristalsis is inhibited. Small bowel peristalsis ...


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Torticollis can occur for several reasons, one of which is a side effect of certain drugs. Rather than highlight one specific drug it is perhaps better to talk about the mechanism of action by which this occurs. Torticollis in a drug induced form is classed as an extrapyramidial side effect. Classically results from some medications which have ...



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