Exsc 224 Nervous System Exam Questions and
Correct Answers
The neuron cannot respond to a second
stimulus, no matter how strong
absolute refractory
The interior of the cell becomes less
negative due to an influx of sodium
ions
depolarization
The specific period during which potassium ions diffuse out of the neuron due to a change
in the membrane permeability
depolarization
Also called a nerve impulse transmitted by axons
action potentials (AP)
An exceptionally strong stimulus can
trigger a response
absolute refractory
Numerous nerve impulses arrive at
a synapse at closely timed intervals
exert a cumulative effect
,temporal summation
Stimulation of a postsynaptic neuron
by many terminals at the same time
spatial summation
An insufficient stimulus
subthreshold stimulus
Any stimulus below this intensity will
result in no response in a neuron
threshold stimulus
Area where nerve impulse is
generated
trigger zone
Receives stimuli
receptive region
Plasma membrane exhibits
voltage-gated Na+ and K+ channels
Conducting region
The plasma membrane exhibits
voltage-gated Ca2+ channels
, secretory region
Axon terminals release neurotransmitters in this area
secretory zone
The plasma membrane exhibits chemically gated ion channels
receptive region
One incoming fiber triggers responses in ever-increasing numbers farther and farther
along the circuit
diverging circuit
May be involved in complex, exacting types of mental processing
parallel after-discharge circuit
Involved in the control of rhythmic activities such as breathing
reverberating circuit
Involved in activating fibers of a skeletal muscle, such as the biceps muscle
diverging circuit
Different types of sensory input can have the same ultimate effect
converging circuit
Increases acid secretion in the stomach; blocked by cimetidine
histamine
"Feel-good" neurotransmitter
Correct Answers
The neuron cannot respond to a second
stimulus, no matter how strong
absolute refractory
The interior of the cell becomes less
negative due to an influx of sodium
ions
depolarization
The specific period during which potassium ions diffuse out of the neuron due to a change
in the membrane permeability
depolarization
Also called a nerve impulse transmitted by axons
action potentials (AP)
An exceptionally strong stimulus can
trigger a response
absolute refractory
Numerous nerve impulses arrive at
a synapse at closely timed intervals
exert a cumulative effect
,temporal summation
Stimulation of a postsynaptic neuron
by many terminals at the same time
spatial summation
An insufficient stimulus
subthreshold stimulus
Any stimulus below this intensity will
result in no response in a neuron
threshold stimulus
Area where nerve impulse is
generated
trigger zone
Receives stimuli
receptive region
Plasma membrane exhibits
voltage-gated Na+ and K+ channels
Conducting region
The plasma membrane exhibits
voltage-gated Ca2+ channels
, secretory region
Axon terminals release neurotransmitters in this area
secretory zone
The plasma membrane exhibits chemically gated ion channels
receptive region
One incoming fiber triggers responses in ever-increasing numbers farther and farther
along the circuit
diverging circuit
May be involved in complex, exacting types of mental processing
parallel after-discharge circuit
Involved in the control of rhythmic activities such as breathing
reverberating circuit
Involved in activating fibers of a skeletal muscle, such as the biceps muscle
diverging circuit
Different types of sensory input can have the same ultimate effect
converging circuit
Increases acid secretion in the stomach; blocked by cimetidine
histamine
"Feel-good" neurotransmitter
