what is the standard level of gaba present in the human brain?
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The level measured in normal human brain (removed within 2 hours of death) is approximately 1.3 µmol/cm3.  The half-life of GABA in a brain that has gone through traumatic oxygen deprivation, followed by loss of ionic control, is unknown, making it difficult to estimate what the level of GABA is in a functioning brain (this is true of all the neurotransmitters).
793555
It's about the average weight of a human brain.
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ANything over about 15 mg/dL is considered hyperglycemic- Under about 4 or 5 would be considered hypoglycemic, though that would be an exceedingly rare condition in the absence of exogenous insulin.  Our laboratory does work on diabetes and uses mice as models- in general, 15 mg/dl is hyperglycemic, but mildly-quite easily diabetic mice can reach glucose levels of over 30.  Normal levels are 7-12.
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http://www.webmd.com/hw/brain_nervous_system/nord640.asp\n\nWEB MD is a great site.
1017609
We have personal choice but this is usually governed by our Limbic System, which is a complex system of nerve pathways and networks in the brain that is involved in the expression of instinct and mood in activities of the endocrine and motor systems of the body. Among the brain regions involved are the Amygdala, Hippocampal formation, and the Hypothalamus.
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brain and detected by our ears.
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Different level of mental states.
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Normal fasting level for blood sugar has been considered to be between 70 and 100.\n\nNormal, around 125 by 2 hours after a meal.\n\nSome sources have said they believe nerve damage begins to occur at a blood sugar level of 135 or more.  So I don't take 160 as being "good" -- not two hours after a meal.
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The model that humans only use 10% of their brain was a myth developed about 30 years ago and completely discredited.  The misunderstanding is due to the fact that most of the brain is not involved in conscious processing or abstract reasoning.  But's still busy, involved with sensory processing, motor control, language etc.  (and these tasks are a lot harder than we ever thought.....)
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There are twenty standard amino acids:\nhttp://www.chemie.fu-berlin.de/chemistry/bio/amino-acids_en.html\nBut there are also two other non-standard amino acids:\nhttp://en.wikipedia.org/wiki/Amino_acid
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The cerebrospinal fluid (CSF) is located within the ventricles, spinal canal, and subarachnoid spaces. The principle source of CSF are the choroid plexi of the lateral, third and fourth ventricles (Figure 6), and the volume varies between 10-20% of brain weight (Bradbury, 1979). The volume of CSF in humans is 140-150 ml, only 30-40 ml actually in the ventricular system, with a production rate of 21 ml/hr. The turnover rate of total CSF is species dependent and varies between approximately 1 hr for rat and 5 hr for human (Davson and Segal, 1996). The majority of the CSF is in the subarachnoid space, where the arachnoid membranes bridge the sulci of the brain, in the basal cisterns and around the spinal cord. CSF moves within the ventricles and subarachnoid spaces under the influence of hydrostatic pressure generated by it production. CSF cushions the brain, regulates brain extracellular fluid, allows for distribution of neuroactive substances, and is the "sink" that collects the waste products produced by the brain.\n\nConcentration of most molecules is greater in the brain than in the CSF, creating a physiological gradient between the two compartments. The continuous flow of CSF through the ventricular system and out over the surface of the brain provides a "sink" that reduces the steady-state concentration of a molecule penetrating into the brain and CSF (Davson et al., 1961). This "sink" effect is greater the slower a molecule moves, which makes it particularly important for lipid-insoluble molecules of large molecular radius (Davson and Segal, 1996). Few drugs gain entry into the brain via CSF uptake due to the bulk flow movement. However, azidothymidine (AZT) enters the brain through rapid distribution into the CSF and subsequent transport at the CSF-barrier via a thymidine transporter (i.e. pyrimidine nucleoside carrier) (Wu et al., 1992), such a transport is not present at the BBB (Cornford and Oldendorf, 1975).
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that wasn't really a question . . . \n\nBut I'll take a stab at it. IQ is normalized periodically around a mean between 100 and 110 and a standard deviation of about 15 (in the USA) and 24 (in Europe).
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they are known as neurotransmitters \nan example in acetylcholine
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There are lots of neurochemicals, and the ones you're interested in are called neurotransmitters...\n\nMajor ones are: gamma amino bytyric acid; serotonin; norepinephrine; dopamine.  Also involved are countless polypeptides (often only a few aminoacids long, sometimes dozens) like melanin, the endorphins, the enkephalins, the endocannabinoids and others...\n\nWe're still unravelling the signalling systems and such of the brain, and the more we learn, the more complex it gets.\n\nThe big thing you have to realize is that the most recent data indicates that it is highly probably that the brain's chemistry is what is called (mathematically) deterministic chaos.  What that means is that any single small step is totally describable, and its immediate outcome is totally predictable, but when you expand to dozens or hundreds of steps, across large areas of involvement, it gets 'way out of hand, and the error of the estimate becomes larger than the estimate.  How environmental influences affect this is really tough to analyze, given the massive complexity and the incompleteness of our data.\n\nYour question, I fear, makes a whalloping lot more sense than my ANSWER, but, well, it's the best answer I've got...
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what is the normal size of a brain in cubic inchs.
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The study of the nervous systems of organisms. Man included
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sure we're getting closer but we're probably 0.000000000000000000001% there. \n\nsome nice reading on the subject is Rodolfo Llinas' book, 'The I of the vortex'. it's a standard text in neurobiology and psychiatry over here but it's simple enough for anyone to read and understand it.