Date post: | 20-Dec-2015 |
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The Brain
• Controls all functions of the body
• The purpose is to protect the brain’s environment
• The brain selects its own environment from the general water environment of the body, the blood
• The brain collects information and adjusts the body
Neurotransmitters
• Many different neurotransmitters
• Some depolarize, make the inside/outside less different (facilitate passing on signals)
• Some hyperpolarize, make the inside/outside more different (inhibit passing on signals)
• Some go both ways (depending on the receiving cell)
In general each nerve cell both receives signals from many other nerve cells and sends signals to many other nerve cells