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Nervous System
n/a
20
Biology
Undergraduate 1
10/18/2010

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Term
Sensory Functions
Definition
Receive Stimulation from receptors that detect internal and external changes.
Term
Neuron
Definition
Includes a cell body dendrites, and an axon.(Functional Unit).
Term
At Threshold
Definition
Sodium ions move in depolarizing the membrane.
Term
Potassium Ions
Definition
Diffuse outward, repolarizing the membrane.
Term
Myelinated Axons
Definition
All the impulses conducted on an axon are of the same strength. conduct impulses more rapidly.
Term
A Neuron
Definition
Is facilitated when it receives subthreshold stimuli and becomes more excitable.
Term
Refelxes
Definition
Are automatic, subconscious responses to changes.
Term
Meninges
Definition
Protective membrane.
Term
Bone and Meninges
Definition
Surround the brain and spinal cord.
Term
Spinal Cord
Definition
Has thirty-one segements that gives rise to a pair of spinal nerves. (31 pairs of spinal nerves originate from the spinal cord).
Term
The Cerebrum
Definition
Consists of 2 cerbral hemispheres connected by the corpus callosum.
Term
One Cerebral Hemisphere
Definition
Usually dominates for certain intellectual functions.
Term
The Choroid Plexuses
Definition
In the wall of the ventricles secrete cerebrospinal fluid.
Term
The Diencephalon
Definition
Contains the thalamus, hypothalamus, which maintains homeostasis.
Term
The Limbic System
Definition
Produces emotins and modifies behavior.
Term
The Brainstem
Definition
Consists of the midbrain, pons, and medulla oblongata.
Term
The Reticular Formation
Definition
Filters incoming sensory impulses, wakefulness when significant impulses arrive.
Term
Cerebellum
Definition
Coordination of skeletal muscel movement and the maintenance of equilibrium.
Term
The Autonomic Nervous System
Definition
Functions woithout concious effort. It regulates the visceral activities that maintain homeostasis.
Term
The Sympathetic Divison
Definition
Responds to stressful and emergency conditions.
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