Chapter 9 Review Flashcards
Astrocytes provide a protection of the brain called ______
Blood-brain barrier
At a synapse, the neuron that is sending the action potential is ______
Presynaptic
This lines the cavities of the brain in the CNS
Ependymal
Produces the myelin in the CNS
Oligo dendrocytes
Supports neurons in the ganglia
Satellite
Star shaped and supports neurons in the CNS
Astrocytes
Smallest size of the neuroglia
Microglia
Forms neurolemma and myelin in PNS
Schwann
The 3 functions of the nervous system are
Sensory, integration And motion
The synaptic cleft is the space that a _____
crosses to initiate a response in a post synaptic neuron
Neurotransmitter
What’s is the difference between a nerve and a tract?
Nerve-PNS
Tract- CNS
(Bundles of myelinated fibers)
The insulating material of a neuron in the PNS is ______
Myeline
Name 2 characteristics that would increase the speed of nerve transmission
- Warmer temp
- Larger diameter
- Has myelin
The body’s natural painkiller is _____
Endorphin
A neurotransmitter that helps regulate moods is
Seritonion
The “fight or flight” nervous system is _____
Sympathetic
Describe the arrangement if the gray a white matter in the spinal cord
Gray-inside-unmyelinated
White-outside- myelinated
Highly branched; input part of the neuron
Dendrite
Unmyelinated gap in the myelin sheath
Node of ravier
Bundle of many axons in the CNS
Tract
Neuron that conveys info from a receptor to the CNS
Sensory(afferent)
Group of cell bodies in the CNS
Nucleus
Neuron that conveys info from the CNS to an effector
Motor neuron (efferent)
Produces myelin sheath in PNS
Shwann cells
Group of cell bodies in PNS
Ganglia
Long, cylindrical process that conducts impulses toward another neuron
Axon
The portion of the neuron containing the nucleus
Cell body
Sac in which the neurotransmitter is stored
Synaptic vesicle
Neuron located entirely within the CNS
Interneuron
Substance used for communication at chemical synapses
Neurotransmitter
Bundle of axons in the PNS
Nerve
Rounded structure s the distal end of an axon terminal
Synaptic end bulb
This type of neuron take impulses to muscles
Motor (efferent)
An axon carries an impulse _____ from a cell body
Away
A neurotransmitter must cross the ______ to initiate an impulse in a postsynaptic neuron
Synaptic cleft
A motor neuron is an example of a ____ nerve
Efferent
A myelinated neuron appears what color?
White
MS is more common in
Women
Membrane where inner an outer surfaces have equal amounts of electrical charge
Depolarized
Membrane where an inner and outer surfaces have unequal amounts of electrical charge
Polarized
Time during which a neuron can’t be stimulated to initiate an impulse
Refractory period
Ions found in high concentration inside the plasma membrane
k+ (potassium)
Ions found in high concentration outside the plasma membrane
Na+ (sodium)
The difference in electrical charges between the inside an outside of a plasma membrane
Resting potential (-70mV)
The mechanism by which ions are moved through the plasma membrane from a lesser to greater concentration
Sodium pump
