In order for local potentials to trigger an action potential, the membrane must reach a level called the ________.
A. resting membrane potential
B. threshold
C. maximum potential
D. spike potential
Answer: B
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A scientist genetically engineers a neuron whose voltage-gated Na+ channels lack the inactivation gate but which is otherwise normal. This neuron would be expected to
a. conduct action potentials bidirectionally. b. lack an absolute refractory period. c. lack a relative refractory period. d. all of these.
Prognosis of giantism is usually poor.
a. true b. false
The presence of many large, highly-branched Purkinje cells in a sample of brain tissue indicates that it came from the
A) pons. B) medulla. C) cerebral cortex. D) cerebellar cortex. E) arbor vitae.
Which cranial nerves arise from the brainstem?
A) I and II B) All the purely sensory nerves arise from the brainstem. C) All the purely motor nerves arise from the brainstem. D) III, IV, V, VI, VII, VIII, XI, X, XI, XII E) All the cranial nerves arise from the brainstem.