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Nervous System
TEST
70
Anatomy
12th Grade
11/09/2010

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Cards

Term
Nervous Tissue is composed of? (2)
Definition
Nerve Cells (AKA neurons) and Neurogila
Term
Neurons react to their ______?
Definition
Environment
Term
Dendrites?
Definition
Receive Input
Term
Axons ______ information away form the cell?
Definition
carry
Term
Nerve impulse?
Definition
Bioelectric Signals
Term
Information is carried from neuron to neuron across the ______?
Definition
Synapse (Space between neurons) by neurotransmitters
Term
Central nervous system consists of? (2)
Definition
Brain and Spinal Cord
Term
Peripheral nervous system is composed of? (3)
Definition
Cranial, Spinal, and Nerve
Term
Three functions of Nervous System?
Definition
Sensory, Integrative, motor
Term
Peripheral nervous system has _____ and _____ branches?
Definition
Somatic, Autonomic
Term
Somatic?
Definition
Sensing and conscious activities
Term
Autonomic?
Definition
Controls unconscious activities
Term
Cell body contains? (3)
Definition
granular cytoplasm, organelles, and microtubules
Term
Neurofibrils?
Definition
support fibers in the cell body
Term
Chromatophilic substance is in?
Definition
Cytoplasm
Term
Dendrites?
Definition
branched receptive structures
Term
Axons?
Definition
have braches, collaterals
Term
Axons end in the ______ _____ at the terminal?
Definition
Synaptic Knob
Term
Axons are separated from another receptive surface by the?
Definition
Synaptic Cleft
Term
Scwann Cells?
Definition
Neuroglial cells that produce the myelin sheath, a lipid-rich covering of the axon
Term
Neurilemma?
Definition
surrounds the myelin sheath and contains the nucleus of the schwann cells
Term
Nodes of the ranvier?
Definition
gaps in the myelin sheath
Term
Fibers WITH myelin sheaths?
Definition
myelinated nerve fibers (white matter)
Term
Fibers WITHOUT myelin?
Definition
unmyelinated nerve fibers (gray matter)
Term
Neuron classification
Definition
Based on stuctural differences
Term
Sends nerve impulse in _____ direction?
Definition
one
Term
Bipolar neurons?
Definition
Two process from the cell body (Dendrite & axon)
Term
Dendrite and Axon are found is what sense organs?(3)
Definition
eyes, nose, ears
Term
Unipolar neurons?
Definition
one process from the cell body that functions as an axon
Term
Unipolar neurons are found in?
Definition
clusters (gentian) outside the brain and spinal cord
Term
Multipolar neurons?
Definition
man processes extend from the cell body, one axon and many dendrites
Term
Multipolar Neurons are found?
Definition
in the brain and spinal cord
Term
Sensory (afferent) neurons?
Definition
carry impulses from the body to brain or spinal cord
Term
Intereurons (association neurons)?
Definition
lie within brain and spinal cord, they form links with other neurons
Term
Motor (efferent) neurons?
Definition
Carry nerve impulses out of the brain or spinal cord to effectors, muscles or glands
Term
Neuroglia are ____ cells?
Definition
helper
Term
Peripheral nervous system?
Definition
Schwann cells
Term
Astrocytes?
Definition
star-shaped cells regulate environment around neurons and aid in healing brain injury
Term
Oligodendrocytes?
Definition
Form myelin in the brain and spinal cord
Term
Microglia?
Definition
support neurons and phagocytize bacteria and cell debris
Term
Ependyma?
Definition
regulate the composition of cerebrospinal fluid
Term
Mature neurons do NOT _____ so neurons are not replaced in response to injury?
Definition
Divide
Term
Damaged axons in _________ nervous system may regenerate?
Definition
peripheral
Term
Schwann cells regenerate the _______ sheath?
Definition
myelin
Term
The cell membrane is _______?
Definition
polarized
Term
Polarized?
Definition
the inside is negatively charged with respect to the outside
Term
Polarization is due to _________ distillation ?
Definition
Ion
Term
k+
Definition
the major intracellular cation
Term
Na+
Definition
The major extracellular cation
Term
Resting nerve cell?
Definition
is one that is not being stimulated to send a nerve impulse (has resting potential)
Term
The nerve impulse is the ______ ______?
Definition
action potential
Term
Hyperpolarized?
Definition
membrane potential becomes more negative than resting (Action potential less likely to occur?
Term
Depolarized?
Definition
the membrane potential becomes less negative (possibly triggers an action potential)
Term
Local potentials are ______?
Definition
graded
Term
the amount of change in potential is proportional to the _______ of the stimulation?
Definition
intensity
Term
Threshold potential?
Definition
level of stimulation is great enough to generate an action potential
Term
Summation?
Definition
add stimuli to reach threshold
Term
Voltage-gated _____ channels open in trigger zone?
Definition
Na+
Term
Na+ diffuses _____, depolarizing the membrane?
Definition
inward
Term
Volatage-gated K+ channels oped, K+ diffuses ______?
Definition
outward
Term
Refractory Period?
Definition
short time following a nerve impulse that a threshold stimulus will not trigger another impulse
Term
If a nerve fiber responds, it responds _______?
Definition
completely
Term
Unmyelinated fibers conducts an impulse over its _______ system?
Definition
entire
Term
Myelinated fibers involve action potentials occurring at the ____ __ _____?
Definition
nodes of ranvier, This is saltatory conduction, this speeds conduction
Term
______ fivers conduct faster?
Definition
Thicker
Term
Nervous system produces at least ____ different neurotransmitters?
Definition
30
Term
list examples of neurotransmitters? (4)
Definition
acetylocholine, monoamines, amino acids, peptides
Term
Neuronal pools?
Definition
groups of neurons that work together
Term
Convergence?
Definition
a single neuron receives impulses from two or more fibers that originate from different parts of neurons system, allow collection and processing information
Term
Divergence?
Definition
an impulse from one neuron stimulates two or more fibers, this may amplify a response, due to axon branching
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