1a. Distinguish between sensory neurons, motor neurons, andassociation neurons in terms of structure, location, andfunction.

1b. Describe the structure of the sheath of Schwann, orneurilemma, and explain how it promotes nerve regeneration. Explainhow a myelin sheath is formed in the PNS.

1c. Explain how myelin sheaths are formed in the CNS. How doesthe presence or absence of myelin sheaths in the CNS determine thecolor of this tissue?

1d. Define the terms depolarization and repolarization, andillustrate these processes graphically.

1e. Describe how the permeability of the axon membrane to Na 1and K 1 is regulated and how changes in permeability to these ionsaffect the membrane potential.

1f. Describe how gating of Na 1 and K 1 in the axon membraneresults in the production of an action potential.

1g. Explain the all-or-none law of action potentials, anddescribe the effect of increased stimulus strength on actionpotential production. How do the refractory periods affect thefrequency of action potential production?

1h. Describe how action potentials are conducted by unmyelinatednerve fibers. Why is saltatory conduction in myelinated fibers morerapid?

1i. Describe the location of neurotransmitters within an axonand explain the relationship between presynaptic axon activity andthe amount of neurotransmitters released.

1j. Describe the sequence of events by which action potentialsstimulate the release of neurotransmitters from presynapticaxons.

1k. Explain how chemically regulated channels differ fromvoltage-regulated channels and the nature of excitatory andinhibitory postsynaptic potentials.

1l. Explain how ligand-gated channels are opened, usingnicotinic ACh receptors as an example.

1m. Explain how ligand-gated channels operate, using muscarinicACh receptors as an example.

1n. Describe where stimulatory and inhibitory effects ofmuscarinic ACh receptors occur and how these effects areproduced.

1o. Compare the properties of EPSPs and action potentials,identify where in a neuron these are

1p. Explain the significance of glutamate in the brain and ofNMDA receptors.

1q. Describe the mechanism of action of glycine and GABA asneurotransmitters, and discuss their significance.

1r. Explain how nitric acid is produced in the body, anddescribe its functions.

1s. Define spatial summation and temporal summation, and explaintheir functional importance.

1t. Explain how postsynaptic inhibition is produced and howIPSPs and EPSPs can interact.

1u. Describe the mechanism of presynapticinhibition.produced.