Rio Bio 201
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,action potentials can be generated by virtually all cells of false, only cells with excitable membranes can generate ap
the body because all cell possess cell membranes
The nodes or Ranvier are found only on myelinated, true
peripheral neural processes
efferent nerve fibers may be described as motor nerve true
fibers
a positive feedback cycle is the main force in the false
generation of graded potentials at receptor ends
a graded potential that is the result of a neurotransmitter true
released into the synapse between two neurons is called
a postsynaptic potential
In myelinated axons the voltage-gated sodium channels true
are concentrated at the nodes of Ranvier
The two major classes of grade potentials are transmitter False, generator potentials and post-synaptic potentials
potentials and receptor potentials
If bacteria invaded the CNS tissue, microglia would true
migrate to the area to engulf and destroy them
Myelination of the nerve fibers in the CNS is the job of true
the oligodendrocyte
Neurons in the CNS are organized into functional groups true
Reflexes are rapid, automatic responses to stimuli true
Large-diameter nerve fibers conduct impulses much true
faster than small-diameter fibers.
During depolarization, the inside of the neuron's true
membrane becomes less negative.
the oligodendrocytes can myelinate several axons true
sensory neurons have long dendrites, while motor true
neurons have long axons
Enkephalins and endorphins are peptides that act like true
morphine.
,A stimulus traveling toward a synapse appears to open true
calcium ion channels at the presynaptic end, which in
turn promotes fusion of synaptic vesicles to the axonal
membrane.
Saltatory conduction occurs because of the presence of false, signal jumping from node to node along the axon
salt around the neuron
Neurons that are far away from the center of the neuron false, facilitated zone
pool and that are not easily excited by and incoming
stimulus are in the discharge zone
Acetylcholine is not a biogenic amine true
A synapse formed between the axon ending of one true
neuron and the cell body of another neuron is called an
axosomatic synapse.
Voltage is always measured between two points and true
may be called the potential between these two points.
the all-or-non phenomenon as applied to nerve false
conduction states that the whole nerve cell must be
stimulated for the conduction to take place
Cell bodies of sensory neurons are located in ganglia true
lying outside the CNS
Strong stimuli cause the amplitude of AP generated to false
increase
Is the main switch station for memory; if the right and left amygdala
areas are damaged, the past is lost.
In stage 3 sleep, these waves and delta waves appear. theta
The largest nuclear mass in the midbrain substantia nigra
These are valvelike and protrude externally through the arachnoid villi
dura mater to absorb cerebrospinal fluid into venous
blood.
he large tract that connects the right and left sides of the corpus callosum
brain
a temporary cessation of breathing during sleep found sleep apnea
most commonly in the elderly
a 24-hour cycle of sleep and wakefulness circadian
, includes the thalamus, hypothalamus, and epithalamus diencephalon
The fourth ventricle is continuous with this part of the central canal
spinal cord.
The infundibulum connects the hypothalamus to this. pituitary gland
is a conduction pathway between higher and lower brain pons
centers and houses nuclei for cranial nerves V-VII.
this type of memory requires practice, and is skill
remembered by doing.
Sensory neurons enter the spinal cord via which type of posterior
horn?
The two longitudinal ridges on the medulla oblongata pyramids
where many descending fibers cross over are called
what?
The superchiasmatic nucleus is found in the hypothalamus
Nuclei of cranial nerves V, VI, and VII are found in the pons
The primary auditory cortex is located in what lobe? temporal
The subarachnoid space lies between the arachnoid and pia
the
The vital centers for the control of heart rate, respiration, medulla
and blood pressure are located in the
The fissure separating the cerebral hemispheres is which longitudinal
fissure?
The rough, thick, leathery meningeal layer is the dura mater
A shallow groove on the surface of the cortex is called a sulcus
Neural tracts that convey life-saving information to the lateral spinothalmic
brain concerning burning pain would be