Chapter 12, 13, 14 Flashcards
The optic (II) nerve emerges from the brain; therefore, it is a type of
cranial nerve
The brachial plexus is a spinal nerve network that serves the muscles of the upper limbs. The brachial plexus is therefore considered part of the
somatic nerve
What is primarily found in the white matter of the spinal cord
myelinated axons
Which types of CNS neuroglia are the most similar in appearance?
astrocytes and oligodendrocytes
Some neurons in the body stretch for several feet. Which of the following is a type of electrical impulse that allows communication over such a distance?
action potential
Phenytoin blocks the opening of voltage-gated Na+ channels in neurons. Therefore, this action has its primary effects on which part of the neuron?
axon
Cells in the sinoatrial node of the heart have a resting membrane potential (RMP) that is approximately –55 mV. How does this compare to the RMP of most neurons?
The RMP of sinoatrial cells is higher than that of most neurons.
An example of a mechanically-gated channel is when a channel opens as a result of
pressure of a fingertip pushing on a doorbell
You need sutures to close a cut on your hand, and lidocaine is used to numb the area. Lidocaine works by
blocking the opening of sodium channels
The cooler the temperature, the slower the propagation of action potentials. T or F
T
Regarding electrical synapses and connexons?
connexons connect the cytosols of the cells involved
An IPSP on one area of the membrane at the same time as an EPSP on another area of the membrane would both be considered for the purposes of
spatial summation
Which of the following neurotransmitters is only excitatory?
Glutamate
Caffeine is an inhibitor of acetylcholinesterase. Therefore, an indirect effect of caffeine would be to
stimulate skeletal muscle contractions
Which of the following are unipolar sensory neurons?
meissner and pacinian corpuscles
What comprises gray matter?
unmyelinated axons and dendrites
In the spinal cord, this surrounds the gray matter.
white matter
What gives gray matter its grayish color?
nissl bodies
The cerebellum and cerebrum are covered by __________.
a thin layer of gray matter
Which of the following is true about glycine’s role as a neurotransmitter?
it causes inhibitory postsynaptic potentials
In a given neuron, the current membrane potential is –60 mV. What does this tell you about the current potential compared to the resting membrane potential of –70 mV?
The membrane is depolarized compared to the resting membrane potential.
Integration of information from sensory neurons can happen in
the brain
In which part of the neuron would the Nissl bodies be found?
soma
