An overabundance of the neurotransmitter norepinephrine is most likely to be associated with manic episode.
Dopamine is a feel good neurotransmitter.
Dopamine
Well, caffeine (like most pyschoactive drugs) exerts its effect on us by altering the activity of some of our neurotransmitters. Neurotransmitters are the nervous system's way of conveying messages between neurons, and also to muscle tissue. Some neurotransmitters that caffeine is known to increase the activity of are norepinephrine, dopamine, and serotonin. The increase in norepinphrine is likely what causes the heart rate to increase, however each of these neurotransmitters has some stimulatory effects. Norepinephrine, however, is a powerfully stimulating neurotransmitter; it is associated with the 'fight or flight' response, which of course includes an increased heart rate. Caffeine can also cause ectopics (extra beats) in the heart if you have too much
The exact mechanism in unknown and likely to remain so for the foreseeable future.
Potassium deficiency more likely, but yes.
Tornadoes are most likely to be associated with a cold front.
Most likely Dopamine which in excess accumulated in the brain cause schizophrenia.
Dementia of the Alzheimer's Type is not caused by any one particular neurotransmitter. In fact, the causes are multifactorial, ranging from genetic (with changes often found on chrosome #1, chromosome #21, and others) to environmental (various proposed toxins) to psychosocial (with some individual not showing symptoms despite significant changes to brain parenchyma, and others showing significant symptoms in spite of minimal evidence of structural changes to the brain). At any rate, the more one reads, solves puzzles, and otherwise engages in cognitive activities, the less likely they are to show symptoms of this disease. So it's "use it or lost it", as they say!
a God or hero
monophyletic
a god or hero :]
Not usually. Gout is more likely to be associated with the hands and feet.