8237427
Descripción
Test por Alexandra Bozan, actualizado hace más de 1 año
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Creado por Alexandra Bozan
hace alrededor de 7 años
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Pregunta 1
Pregunta
A neurotransmitter can be either excitatory or inhibitory depending on the postsynaptic receptor.
Respuesta
- True
- False
Pregunta 2
Pregunta
The autonomic nervous system consists of the:
Respuesta
-
peripheral and afferent nervous systems
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sympathetic and parasympathetic nervous systems
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sympathetic and efferent nervous systems
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parasympathetic and somatic nervous systems
Pregunta 3
Pregunta
Gray matter in the brain and spinal cord consists primarily of:
Respuesta
-
NERVE FIBERS
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neuroglia
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axons
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cell bodies
Pregunta 4
Pregunta
Neurotransmitters are released in a synapse and bind to
Respuesta
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presynaptic terminals
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the synaptic cleft
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the base of the axon
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receptors on the postsynaptic neuron
Pregunta 5
Pregunta
Compared to the outside of the neuron, the inside has a [blank_start]negative[blank_end] charge.
Respuesta
-
negative
-
positive
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equal
-
none of the above
Pregunta 6
Pregunta
When an impulse reaches a synapse
Respuesta
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two nerve fibers come in direct contact
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impulses will pass in either direction
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an electrical spark will jump the gap
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chemical transmitters are released
Pregunta 7
Pregunta
Along a neuron, the correct pathway for impulse conduction is
Respuesta
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dendrite, axon, cell body, and receptor
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dendrite, cell body, and axon
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axon, cell body, and dendrite
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receptor, axon, and cell body
Pregunta 8
Pregunta
Which is true of an action potential?
Respuesta
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The plasma membrane is impermeable to Na+ and K+ ions.
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Na+ ions move extracellularly.
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The charges become equal on the outside and inside of the plasma membrane.
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The outside of the plasma membrane is negatively charged and the inside is positively charged.
Pregunta 9
Pregunta
In the human nervous system:
Respuesta
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most of the cells are neurons
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most of the cells are glia cells
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there are almost equal numbers of glia cells and neurons
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the ratio of cells is unknown because of the complexity of the nervous system
Pregunta 10
Pregunta
Which of the following is a function of the central nervous system (CNS)?
Respuesta
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integrating sensory information
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evaluating the information
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Initiating an outgoing response e are f
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all of the above are functions
Pregunta 11
Pregunta
Small, distinct regions of gray matter within the CNS are called nuclei.
Respuesta
- True
- False
Pregunta 12
Pregunta
Interneurons reside:
Respuesta
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in the CNS and peripheral nervous system
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in the CNS only
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in the peripheral nervous system only
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none of the above
Pregunta 13
Pregunta
The central nervous system consists of the brain, spinal cord, and nerves.
Respuesta
- True
- False
Pregunta 14
Pregunta
Which of the following is true of spatial summation?
Respuesta
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Simultaneous stimulation of more than one postsynaptic neuron occurs.
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Impulses are fired in a rapid succession by the same neuron.
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Neurotransmitters released simultaneously from several presynaptic knobs converge on one postsynaptic neuron.
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Speed of impulse transmission is increased when several neurotransmitters are released.
Pregunta 15
Pregunta
A neuron that transmits a nerve impulse toward the central nervous system is called a(n):
Respuesta
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motor neuron
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sensory neuron
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interneuron
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bipolar neuron
Pregunta 16
Pregunta
Nerves that contain mostly afferent fibers are called:
Respuesta
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sensory nerves
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motor nerves
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mixed nerves
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Schwann nerves
Pregunta 17
Pregunta
The part of the nervous system that transmits impulses from the CNS to the skeletal muscle is the:
Respuesta
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somatic nervous system
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autonomic nervous system
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central nervous system
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afferent division
Pregunta 18
Pregunta
Which is true of a reflex arc?
Respuesta
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It does not involve the brain.
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It always consists of an afferent and an efferent neuron.
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It always consists of an afferent neuron, an efferent neuron, and an interneuron.
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It always consists of an afferent neuron, an efferent neuron, the brain, and the spinal cord.
Pregunta 19
Pregunta
The central nervous system is composed of efferent nerves only.
Respuesta
- True
- False
Pregunta 20
Pregunta
A synapse consists of:
Respuesta
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a synaptic knob
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a synaptic cleft
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the plasma membrane of a postsynaptic neuron
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all of the above
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