Exam 41: Neural Signaling

Figure 41-2 Use the figure to answer the corresponding question(s). -When the dentist gives you a shot of Novocain, why to you not feel any pain when s/he drills into your tooth?

Figure 41-3 Use the figure to answer the corresponding question(s). -Step 2 in Figure 41-3 is accomplished by:

In multiple sclerosis, a victim:

Figure 41-3 Use the figure to answer the corresponding question(s). -The all-or-none reaction means that:

Figure 41-2 Use the figure to answer the corresponding question(s). -Refer to Figure 41-2.Which of the following would have an effect on the structure in part 1?

Ligand-gated ion channels bind __________ to allow passage of ions.

Star-shaped neuroglia are called astrocytes. ____________________

The myelin sheath:

MATCHING Match the part of the neuron with its description. a.axon d.node of Ranvier b.dendrite e.synaptic vesicle c.myelin sheath -transports neural impulses away from the cell body

Saltatory conduction:

In convergence, a single neuron is controlled by signals from two or more presynaptic neurons. ____________________

In a neuron at rest, there is a higher concentration of sodium ions outside the cell than inside. ____________________

Figure 41-2 Use the figure to answer the corresponding question(s). -Based on part 2 of Figure 41-2, the ions involved in __________ are __________.

An inhibitory post-synaptic impulse (IPSP):

During the absolute refractory period, the axon membrane cannot transmit another action potential. ____________________

In a resting neuron:

Which of the following is not characteristic of neurotransmitters?

In saltatory conduction, the membrane is depolarized only in the region of the myelin sheath. ____________________

Which statement about the structure of neurons is true?

Make a sketch that shows how the neuron develops and maintains a resting potential.BONUS: What is the approximate value of this resting potential in a typical neuron?