Chapter 8 The Brain in control of it all
Evolution of the Brain
The Primitive Brain Still Resides in the Human Brain
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
Information Blood: hormones
The Nerve Cell
Transmitting A Signal
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)
Signaling
Nerve Cell
In general each nerve cell receives signals from many other nerve cells and sends signals to many other nerve cells
Spinal cord
Reflexes
Autonomic Nervous system Parasympathetic Sympathetic
Medulla Autonomic nervous system, breathing etc
Hypothalmus and pituitary gland
Pituitary Gland Portal vein Hypothalamus
Balance: Negative Feedback
Limbic System
Reticular Activating System
The basic core of the brain
Cerebellum: motor guidance Cerebellum
Cerebral Cortex
Localized Functions
Two Brains
Drugs Information or disinformation Alter balance Tollerance Dependance