Chapter 11 quiz review
Which of the following is NOT a biogenic amine neurotransmitter?
Acetylcholine
Which of the following electrical events occurs when a certain threshold is reached?
Action potential
Which of the following statements best describes the resting membrane state in the neuron?
All of the voltage-gated Na+ and K+ channels are closed.
Which of the following neuroglia are most responsible for helping determine capillary permeability in the central nervous tissue?
Astrocytes
Which of the following is a rare type of sensory neuron that is found in special sensory structures such as the retina of the eye?
Bipolar
n a __________ circuit, multiple presynaptic neurons innervate a single postsynaptic neuron.
Converging
Which of the following neurotransmitters act(s) as a natural opiate?
Endorphins
Which cells line the central cavities of the brain and spinal cord and provide a fairly permeable barrier between the CSF and nervous tissue?
Ependymal cells
Neurons can be classified structurally by the number of processes extending from their cell bodies. Which of the following is the most common neuron type in humans?
Multipolar
Which of the following substances is NOT a neurotransmitter?
acetylcholinesterase
Which of the following divisions of the nervous system is also known as the involuntary nervous system?
The autonomic nervous system
Which of the following explains the inability of a neuron to respond to a second stimulus of equal strength to the first stimulus to which it has already responded?
The neuron is in the absolute refractory period.
Which of the following is characteristic of an action potential?
Voltage-gated ion channels
Spatial summation occurs when __________.
multiple local potentials occur at different places on the same cell at the same time
Which of the following defines integration?
processing and interpreting sensory input and determining what should be done at each moment in the body
The sodium-potassium ion pump will __________.
pump three sodium ions out of the cell for every two ions of potassium it brings into the cell
Which of the following characteristics is NOT associated with a myelinated nerve fiber?
slow conduction of nerve impulses
From where can collaterals emerge on a myelinated nerve?
the nodes of Ranvier
In a neuron, a membrane potential of -90 mV is considered __________.
Hyperpolarized
The CNS can discriminate between strong and weak stimuli as strong stimuli __________.
Increase the frequency of action potentials
Which of the following conditions would cause synaptic potentiation?
Influx of Ca++
Which of the following events occurs at an electrical synapse?
Ions flow directly from one neuron to the next.
Which of the following factors is associated with increased conduction velocity in an axon?
Large diameter
Which of the following membrane ion channels in the neuron are always open?
Leakage channels
Relative to extracellular fluid, the interior of a neuron has a negative charge because __________.
Potassium diffuses out of the cell
During which phase of an action potential are voltage-gated K+ channels open, while voltage-gated Na+ channels are closed?
Repolarization
Organelles slated for degradation or recycling are moved through the axon by ___________.
Retrograde movement
The Nissl bodies in the neuron cell body are otherwise known as which cellular organelle(s)?
Rough ER
The sensory, or afferent, division of the peripheral nervous system transmits information from the __________ to the CNS.
Skin
Which of the following statements concerning inhibitory synapses (IPSPs) is correct?
The postsynaptic membrane becomes more permeable to potassium and chloride
