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chpt 8 nervous system
anatomy and physilogy
30
Anatomy
Not Applicable
09/24/2012

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Term
TWO COMMUNICATION SYSTEMS
Definition
1. Nervous System- transmits messages by nerve impulses, which travel very fast.

2. Endocrine System-Transmits messages by chemicals.
Term
ORGANS OF NERVOUS SYSTEM
Definition
1.Brain
2.Spinal Cord
3. Nerves throughout body
4.Specialized sense organs
5.Tiny sense organs in skin
Term
TWO PRINCIPAL DIVISIONS OF NERVOUS SYSTEM
Definition
1.Central Nervous System- Consist of brain and spinal cord

2.Peripheral Nervous System
Term
TWO TYPES OF CYCLES FOUND IN NERVOUS SYSTEM
Definition
1.Neurons- Consists of three parts; Cell body, Axon, Dendrites.

2.Neuroglia- Connective tissue cells
Term
THREE TYPES OF NEURONS
Definition
1.Sensory
2.Motor
3.Interneurons
Term
THREE TYPES OF NEUROGLIA
Definition
1.Astrocytes
2.Microglia
3.Oligodendrocytes or oligodendroglia
Term
THREE MAIN COMPONENTS OF SYNAPSE
Definition
1.Synaptic bulb-bulge on end of presynaptic
2.Synaptic Cleft-space between 2 neurons
3.Plasma Membrane-protein receptors neurotransmitters bind to impulse intiation
Term
FOUR MAJOR DIVISIONS OF BRAIN
Definition
1. Brain Stem
2. Diencephalon
3. Cerebellum
4. Cerebrum
Term
CNS
Definition
Central Nervous System
Term
FUNCTIONS OF NERVOUS SYSTEM
Definition
1. Receiving sensory input
2. integrating information
3. Controlling muscles and glands
4. Maintaining homeostasis
5. Serving as the center of mental activity
Term
PNS
Definition
Peripheral Nervous System
Term
NEURONS
Definition
Receive stimuli and conduct action potentials
Term
NEURGLIA
Definition
Support cells of the nervous system
Term
GRAY MATTER
Definition
Forms the cortex and nuclei in the brain and ganglia in the PNS
Term
WHITE MATTER
Definition
Forms nerve tracts in the CNS and nerves in the PNS
Term
SYNAPSE
Definition
Is a point of contact between two neuron or between a neuron and another cell
Term
SPINAL NERVES
Definition
Communicate between the spinal cord and the body
Term
ASCENDING(AFFERENT)
Definition
Carry nerve imoulse UP
Term
DESCENDING(EFFERENT)
Definition
Carry nerve impulse DOWN
Term
Definition
CRANIAL 12 PAIRS
Term
Definition
SPINAL 31 PAIRS
Term
PARASYMPATHIC
Definition
normal everyday actions
Term
SYMPATHIC
Definition
control emotions; fears, anxiety
Term
Definition
somatic nervous system is voluntary and under conscious control
Term
Definition
autonomic nerves system is involuntary
Term
PARTS OF NEURON
Definition
1. cell body- main part of cell
2. axon- transmit impulses away from cell
3. dandrite- transmit impulse to cell
Term
MUSCLE TYPES
Definition
1.Smooth-nonstraited or involuntary
2.Cardiac-composed of heart
3.Skeletal-voluntary or straited
Term
PRIMARY FUNCTIONS OF MUSCULAR SYSTEMS
Definition
1.Movement
2.Posture
3.Heat Production
Term
ATROPHY
Definition
when muscles are not used they shrink in size and become less useful
Term
HYPERTROPHY
Definition
Increase in muscle size
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