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44 Cards in this Set

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What are the functions (3) of the Nervous system?
Detect changes and feel sensations, Initiate responses to changes, and Organize and store information.
The centeral nervous system (CNS) consists of the ______ and ______.
brain and spinal
The peripheral nervous system (PNS) consist of the _____ and _____ nerves.
cranial and spinal
The autonomic nervous system (ANS) is part of the _____ nervous system division.
CNS or PNS
peripheral
PNS
The term that means nerve cell is ____________.
neuron
Name the 3 major parts of a neuron.
cell body
axon
dendrites
Neuron cell body contains the ________, cell bodies are in the ____ or in the trunk and are protected by bone.
nucleus

CNS
_____ carries impulses away from the cell body.
Axon
________ contains the nucleus of the neuron.
Cell body
_______ carries impulses toward the cell body.
dendrites
The space between the axon of one neuron and the dendrites of the cell body of the next neuron is called the __________.
snapse
In the PNS, the myelin sheath is made by cells called ______.
schwann cells
In the CNS, the myelin sheath is made by cells called ___________.
oligodendrocytes
The function of the myelin sheath is to provide _________ ________ for neurons.
electrical insultation
In the PNS, the neurolemma is formed by which parts of the Schwann cells?
nuclei and cytoplasm
The neurolemma permits ___________ of damaged axons or dendrites in the PNS.
regeneration
A _________ carries the impulse across a _____ and is then destroyed by a ________ ____________.
neurotransmitter
synapse

chemical inactivator
Name the inactivator for the neurotransmitter actylcholine.
cholinesterase
_____________- also called Efferent neurons.
Motor neurons
________________- also called Afferent neurons.
Sensory neurons
_____________ are neurons found entirely within the CNS.
Interneurons
__________ are made of both sensory and motor neruons.
Mixed nerve
__________ - is a group of functionally related neurons within the CNS.
Nerve tract
_________ carries impulses from receptors to the CNS.
Sensory neurons
__________ carries impulses from the CNS to effectors.
Motor neurons
___________ - neuron membrane has a (+) charge outside and a (-) charge inside.
Polarization
_____________ - entry of Na (sodium) ions and reversal of charges on either side of the membrane.
Depolarization
When a neuron is not carring an impulse, its cell membrane has a ___ charge outside and a ___ charge inside. The ions that are more abundant inside the cell are ____ ions.
positive

negative
Sodium (Na)
____________ is brought about by a stimulus, which makes the neuron membrane very permeable to ___ ions, which rush ___ the cell. As a result, the membrane now has a ____ charge outside and a ___ charge inside.
Depolarization
sodium (Na)
into
negative
positive
Immediatley following depolarization, the neuron membrane becomes very permeable to ____ ions, which rush _____ the cell. This is called ____________.
As a result, the membrane now has a ____ chargfe outside and ____ charge inside. The Na and K ions are returned to their proper sites by the ______ & ____ pumps.
potassium (K)
out of
repolarization
positive
negative
sodium and potassium pumps
What are the two functions of the spinal cord?
transmit impulses to and from the brain.
And integrates the spinal cord reflexes.
The spinal cord is protected from mechanical injury by the ______, (bones)extends from the _______ ______ to the disc between the ___ & ___ ____________.
vertebrae

foramen magnum
1 & 2nd lumbar vertebrae
The cell bodies of motor neurons and interneurons are located in the ___________.
gray matter
The cell bodies of sensory neurons are located in the _______ ______ __________.
dorsal root ganglion
The dorsal root may also be called the ________ root because it is made of _____ neurons.
sensory

sensory
The ventral root may also be called the ____ root because it is made of ______ neurons.
motor

motor
The ascending and descending tracts of the spinal cord are located in the ____ _____.
white matter
Ascending tracts may be called ______ tracts because they carry impulses ____ the brain.
sensory

toward
Descending tracts may also be called _____ tracts because they carry impulses _______ the brain.
motor

away from
Cerebrospinal fluid is found within the _____ ______.
central canal
trunk______ cervical pairs to head, ____, shoulder, arm and _________. _____ thoracic pairs to _______. ___ lumbar pairs and ___ sacral pairs to ____, pelvic cavity and ____. ___ very small coccygeal pair.
8 neck, diaphragm
12 trunk
5
5 hip , leg
1
A reflex is an ____________ response to a ______________.
involuntary

stimulus
A reflex arc is the _________ nerve impulses _______ during a reflex.
pathway

travel
proper sequence of a reflex arc; (1) ______ (2) _____ ____ (3)CNS, with one or more synapses (4) ____ ______ (5) effector which responds.
(1) receptors
(2)sensory neurons
(4)motor neurons