5342281
Descripción
Test por Sina Moglestue, actualizado hace más de 1 año
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Creado por Sina Moglestue
hace más de 8 años
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Pregunta 1
Pregunta
In a polarized neuron at rest, which ion is concentrated outside the cell?
Respuesta
-
Na+
-
Ca++
-
None of the above
-
K+
Pregunta 2
Pregunta
The period of time in which the neuron cannot generate another action potential is called the
Respuesta
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all or none period
-
refractory period
-
latent period
-
sublimial period
Pregunta 3
Pregunta
A typical resting membrane potential is
Respuesta
-
+30 mv
-
0 mv
-
-70 mv
-
+100 mv
Pregunta 4
Pregunta
Impulses are conducted from one neuron to another across a
Respuesta
-
Ganglion
-
synapse
-
neurofibral node
-
neuroeffector junction
Pregunta 5
Pregunta
Which of the following is true about synapses?
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-
Neurotransmitters are released by the dendrites at synapses
-
information jumps synapses in the form of electric arcs
-
neurotransmitters are released in the form of Na and K vesicles
-
information passes in only one direction across synapses
Pregunta 6
Pregunta
Which of the following best describes the transmission of an impulse along a neuron?
Respuesta
-
the movement of a neurotransmitter along a neuronal membrane
-
sodium and potassium ions moving over the surface of the neuron
-
a wave of depolarization spreading from the point of the stimulus
-
positive charges spreading over the surface of an excitable cell
Pregunta 7
Pregunta
Which of the following is released by a presynaptic neuron to generate an impulse in the postsynaptic neuron?
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-
an electric spark
-
integrators
-
neurotransmitters
-
packets of sodium and potassium
Pregunta 8
Pregunta
The thalamus and hypothalamus are parts of the brain located in the
Respuesta
-
Diencephalon
-
Pons
-
Medulla oblongata
-
Midbrain
Pregunta 9
Pregunta
the ability of neurons to respond to stimuli and convert them to impulse is called
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-
excitability
-
faciliation
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summation
-
depolarization
Pregunta 10
Pregunta
the type of neuroglial cell found between neurons and blood vessels that join parts by numerous cellular processes are
Respuesta
-
astrocytes
-
ependymal cells
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oligodendrocytes
-
microglial cells
Pregunta 11
Pregunta
emotions of fear, anger, and pleasure are produced by the
Respuesta
-
pons
-
cerebellum
-
limbic system
-
medulla oblongata
Pregunta 12
Pregunta
which of the following is not a structural feature of a neuron?
Respuesta
-
neurolemma
-
synapse
-
missl granules
-
axon
Pregunta 13
Pregunta
the job of maintaining homeostasis is a function of the ___ and ___ systems
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nervous...endocrine
-
nervous...digestive
-
endocrine...digestive
-
urinary...digestive
Pregunta 14
Pregunta
if a neuron within the CNS has its axon severed,
Respuesta
-
the neuron will be spurred to reproduce a fully functional one
-
the neuron will lose its funstion
-
the neuron will most likely die
-
it will soon regenerate
Pregunta 15
Pregunta
It can be said that in a resting neuron, the
Respuesta
-
inside of the cell is more electropositive than the outside
-
concentration of K+ ions is greater outside the cell
-
membrane is polarized
-
all of the above
Pregunta 16
Pregunta
A cross section of the cord reveals a core of white matter surrounded by gray matter
Respuesta
- True
- False
Pregunta 17
Pregunta
neurons, like muscle fibers, conduct impulses according to the all or none response
Respuesta
- True
- False
Pregunta 18
Pregunta
A nerve impulse would travel faster down a myelinated C fiber
Respuesta
- True
- False
Pregunta 19
Pregunta
Synaptic conduction of a nerve impulse can be affected by changes is pH
Respuesta
- True
- False
Pregunta 20
Pregunta
during a neuron's resting state, it is full of Na+ ions
Respuesta
- True
- False
Pregunta 21
Pregunta
neurons have plasma membranes which contain a variety of ion charges
Respuesta
- True
- False
Pregunta 22
Pregunta
A neuron will respond maximally to a sub-threshold stimulus
Respuesta
- True
- False
Pregunta 23
Pregunta
the jejenum is the first part of the small intestine
Respuesta
- True
- False
Pregunta 24
Pregunta
One part of the stomach is called the cardiac region
Respuesta
- True
- False
Pregunta 25
Pregunta
Cells that secrete hydrochloric acid are called chief cells
Respuesta
- True
- False
Pregunta 26
Pregunta
peristalsis acts to move food along the alimentary tube
Respuesta
- True
- False
Pregunta 27
Pregunta
the starting place for chemical digestion is the stomach
Respuesta
- True
- False
Pregunta 28
Pregunta
One function of the esophagus is to coat the bolus with mucus
Respuesta
- True
- False
Pregunta 29
Pregunta
The digestive enzyme pepsin secreted by gastric glands begins the digestion of
Respuesta
-
sucrose
-
fat
-
protein
-
carbs
Pregunta 30
Pregunta
The main part of the stomach is called the
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-
fundic region
-
pyloric region
-
cardiac region
-
none of these
Pregunta 31
Pregunta
The salivary enzyme amylase functions to digest
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-
carbs
-
fats
-
all of these
-
proteins
Pregunta 32
Pregunta
The teeth that are best adapted for biting off large pieces of food is called the
Respuesta
-
incisors
-
cuspids
-
molars
-
bicuspids
Pregunta 33
Pregunta
Peristalsis occurs in the digestive tract
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-
from the pharynx to anus
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in the stomach and small intestines only
-
in the small and large intestines only
-
in the stomach, small intestine, and large intestines only
Pregunta 34
Pregunta
The material that covers the crown of the teeth is
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-
cementum
-
dentin
-
enamel
-
plaque
Pregunta 35
Pregunta
What parts of a tooth are destroyed by dental caries?
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-
Enamel
-
Dentin
-
Pulp
-
Cementum
Pregunta 36
Pregunta
The digestive enzyme pepsin secreted by gastric glands begins in the digestion of
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-
carbohydrates
-
protein
-
fats
-
none of these
Pregunta 37
Pregunta
Type A hepatitis is transmitted by
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Ingestion of food contaminated by feces
-
transfusion with blood contaminated by the hepatitis virus
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use of improperly cleaned needles
-
sexual activity
Pregunta 38
Pregunta
The foods that stay in the dtomach for longest are high in
Respuesta
-
fats
-
proteins
-
carbs
-
amino acids
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