Ch 12 Nervous Tissues Flashcards
At the normal resting membrane potential of a typical neuron it’s sodium potassium exchange pump transports
Three intracellular sodium ions for one extracellular potassium ion
What triggers the release of a acetylcholine from a synaptic terminal
Diffusion of calcium ions into the synaptic terminal
The minimum stimulus required to trigger an action potential is known as the
Threshold
Are the most numerous type of neuron in the CNS
Interneurons
The part of the peripheral nervous system that carries sensory information to the CNS is designated
Afferent
The rabies virus travels to the CNS via
Retrograde axoplasmic transport
ESPS occurs when
Extra sodium ions enter a cell
Which type of synapse is most common in the nervous system
Chemical
The Myelin sheath that covers many CNS axons is formed by
Oligodendrocytes
Cholnergic synapsis releases the neurotransmitter
Acetylcholine
Branches that may occur along an axon are called
Collaterals
Summation that results from the cumulative effect of multiple synapses at multiple places on the neuron is designated
Spatial summation
What provides information about the external environment
Exteroceptors
Which of the following is not involved in creating the resting membrane potential of a neuron
Membrane permeability for sodium ions greater than potassium ions
A shift of the resting transmembrane potential towards zero MB is called
Depolarization
Regions of the CNS were neurons cell bodies dominate constitute the
Gray matter
The presence of what dramatically increases the speed at which an action potential moves along an axon
Myelin
Ion channels that are always open or called
Leak channels
What division of the nervous system carries motor commands to muscle glands
Efferent
The all or nothing principal states that
All stimuli great enough to bring the membrane threshold will produce identical action potentials
Neurons that have one axon and one dendrite with the soma in between are called
Bipolar
The largest and most numerous of the glial cells in the central nervous system are
Astrocytes
Neuroglia of the peripheral nervous system include
Satellite sells Ann Schwann cells
These branching neuron processes serve as receptive regions and transmit electrical signals toward the cell body they are called
Dendrites
Neuron fibers running through the central nervous system form tracks of
White matter
Neurons can be classified according to function. Or motor neurons carry electrical signals from the central nervous system primarily to muscles or glands
Efferent
These nervous system cells are highly specialized to transmit messages throughout the body
Neurons
Chromatophilic substance found within the cell bodies of neurons is involved in the metabolic activities of the cell and is composed of
Rough endoplasmic reticulum
This part of the neuron generates and conducts action potentials
Axon
What forms synapses or junctions with other neurons or effector cells
Axon terminal
The four nation of myelin in the peripheral nervous system is accomplished by these cells
Schwann cells
Milan is important in
Insulating axons and increasing the conduction velocity of action potentials
A bundle of axons in the CNS is called
A tract
A cluster of neurons in the peripheral nervous system is called a
Ganglion
Oligodendrocytes form myelin around
Several axons in the central nervous system
Festivals in the axon terminal contain
Neurotransmitters
You have lost the sensation but not movement and one of your hands due to a problem with your spinal cord neurons based upon these symptoms what type of neuron was most likely affected
Afferent neuron
Enter neurons in the brain are likely to be
Multipolar
These neurons transmit impulses from CNS to effectors
Motor neurons
These glial cells play a role in capillary neuron exchanges in control the chemical environment around the neurons
Astrocytes
