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majority of brain cells (anywhere from 50-90% in brain tissue sample)

Glia cells

meeting point between two neurons where messages are shared
- Most volume of cell is not synapses (points of contact are small fraction of total cell.


Occurs when not all cells are firing at the same time


Neves that send impulse towards the nervous system from the body's muscles and skin. Messages are "incoming."


Nerves that send impulses away from the nervous system to the muscles. Messages are "outgoing."


Somatic nervous system-- voluntary or involuntary


Autonomic nervous system-- voluntary or involuntary


Division that tries to make organs as efficient as possible

Sympathetic Division

Division that tries to store as much energy as possible

Parasympathetic Division

Sympathetic and Sympathetic CAN or CANNOT both work completely at same time.

Cannot- seesaw

Nerve cells are derived from similar cells that go onto form our ________.


All nerve tissue not encased in bone (skull, spinal column) is part of the _________ Nervous System.


The _______ Nervous system consists of the nerves which directly connect to the skin, muscles, blood vessels, and organs of the body.


The __________ Nervous system sends messages to the muscles, and connective tissues attached to the skeleton and skin. Responsible for voluntary movements and sensations such as heat, cold, pressure, vibration, pain.


The __________ Nervous system is responsible outside of the things we can control such as internal organs and glands, smooth muscles, and blood vessels.


The two subdivisions of the Autonomic nervous system

Sympathetic and Parasympathetic

The __________nervous system, or the "fight or flight" system, causes increased blood flow, increased heart rate, increased blood and respiration rates,and reduction of blood flow to tissues on body surface gas tracet.


The nervous system known as the "rest and relaxation" nervous system... most active during digestion and resting.


The nervous system that causes a rise in blood from to gas tract and decreases heart rate, blood pressure, and respiration rates.


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