front 1 Which of the following structures is not part of the central nervous system?
| back 1 a nerve |
front 2 Myelinates nerve fibers in the cns | back 2 oligodendrocyte |
front 3 Lines brain cavities | back 3 ependymal cell |
front 4 Myelinates nerve fibers in the pns | back 4 schwann cells |
front 5 cns phagocytes | back 5 microglia |
front 6 Helps regulate the ionic composition of cns extracellular fluid | back 6 astrocyte |
front 7 What type of current flows through the axolemma during the steep phase of repolarization? | back 7 chiefly a potassium current |
front 8 Assume that an epsp is being generated on the dendritic membrane. which will occur?
| back 8 I single channel will open permitting simultaneous flow of Na+ and K+ |
front 9 The velocity of nerve impulse conduction is greatest in?
| back 9 heavily myelinated large diameter fibers |
front 10 Chemical synapse are characterized by all of the following except?
| back 10 ions flowing through channels form the presynaptic to the postsynaptic neuron |
front 11 Biogenic amine neurotransmitters include all of the following except?
| back 11 acetylcoline |
front 12 The neuropeptides that act as natural opiates are? | back 12 enkephalins |
front 13 Inhibition of acetylcholinesterase by poisoning blocks neurotransmission at the neuromuscular junction because? | back 13 ACh is not degraded hence prolonged depolarization is is enforced on the postsynaptic cell. |
front 14 The anatomical region of a multipolar neuron that has the lowest threshold for generating an AP (action potential) is the? | back 14 axon hillock |
front 15 An IPSP is inhibitory because? | back 15 it hyperpolarizes the postsynaptic membrane |
front 16 Impulses continue around and around a circuit until one neuron stops firing | back 16 reverberating |
front 17 One or a few input ultimately influence large numbers of neurons | back 17 diverging |
front 18 Many neurons influence a few neurons | back 18 converging |
front 19 May be involved in exacting types of mental activity | back 19 parallel after-discharge |