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2_16 - Chapter 17 A large cyclic structure built on four...

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2/16/2010 1 Chapter 17 A large cyclic structure built on four pyrrole rings, called a porphyrin, is important in the chemistry of living organisms. Porphyrins form metal ion complexes in which a metal is located in the middle of the large ring structure. Porphyrin Heme
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2/16/2010 2 A neurotransmitter is a chemical substance that is released at the end of a nerve, travels across the synaptic gap between the nerve and another nerve, and then bonds to a receptor site on the other nerve, triggering a nerve impulse. Neurotransmitter The most important neurotransmitters in the human body are acetylcholine, and the amines dopamine, serotinin, and norepinephrine. Dopamine: Found in brain and its deficiency may cause Parkinson disease Serotonin: Involved in sleep, sensory perception in mental illness Norepinepherine: Helps maintain muscle tone in blood vessels Dopamine Serotonin Norepinepherine
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2/16/2010 3 Epinephrine: Important in central nervous system stimulant
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