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BIOS 256 EXAM 2 CHAMBERLAIN (Latest 2024 / 2025) Questions and Answers (Verified Answers)
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BIOS 256 EXAM 2 CHAMBERLAIN (Latest 2024 / 2025) Questions and Answers (Verified Answers)
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BIOS 256 EXAM 2 CHAMBERLAIN (Latest )Questions and Answers (Verified Answers)
What is the major cause of membrane depolarization?
influx of sodium ions
The neuroglia forming the myelin sheath around neuron fibers in the PNS are:
Schwann cells
The resting membrane potential is characterized by
high potassium and protein inside the cell, and high sodium and calcium outside the cell
Inside an activated cell
Na+ and Ca++ are higher in concentration than in the resting state
An action potential
is propagated by opening of voltage-gated sodium channels
What is saltatory conduction in a neuron? Is it fast or slow?
Saltatory conductions describes how an action potential jumps node to node in a myelinated fiber. It is
fast.
The substance released at axonal endings to propagate a excitatory postsynaptic impulse is called a(n)
neurotransmitter
When a postsynaptic neuron receives repeated stimuli in a short time, this causes
temporal stimulation
An excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle is
acetylcholine
A neural circuit with input traveling along several pathways for integration by several CNS systems and
providing several responses is a
parallel processing circuit
Brain wave amplitude
, reflects the number of neurons firing synchronously
What characterizes the fourth stage of sleep in the sleep cycle?
EEG pattern is dominated by delta waves; skeletal muscles are relaxed; arousal difficult
Fact memory
ability to learn specific information
Activation of the reticular activating system results in
wakefulness
Which controls the autonomic nervous system?
hypothalamus
Which stimulates inspiration?
pons apneustic center
Which is innervated by the somatic nervous system
skeletal muscle
The site of origin of the preganglionic fibers of the parasympathetic nervous system is the
brain stem and the sacral region of the spinal cord
All preganglionic axons of the autonomic nervous system release
the same transmitter as the one released by parasympathetic postganglionic axons
Which provides the ultimate control for the sympathetic nervous system?
hypothalamus
Potentially damaging stimuli that result in pain are selectively detected by
nociceptors
Which type of receptors frequency of sensory neuron action potentials increases with the generator
potential and stimulus amplitude?
tonic
Which skin receptors detect texture and vibrations?
Meissner's corpuscles
When a skin area's two-point threshold is large, that skin has
low sensory acuity
How does a gustatory cell respond to sour tastes?
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