Random multiple choice questions Flashcards
When assessing potential working memory deficits following head trauma, it is important to:
Use stimuli that have to be retained only for brief periods of time
Which of the following is the main reason that the opening of sodium channels causes a very rapid depolarization of most neurons?
A) The movement of a sodium ion produces a larger voltage change than the movement of other ions.
B) Sodium ion diffusion proceeds so quickly that whenever sodium channels are open, there is a rapid directional flux across the membrane.
C) The conjunction of the sodium gradient and the negative membrane potential produces a very large driving force on sodium ions.
C
The most common means by which migrating neurons move through the CNS is by
following radial glia fibers
Choose the best answer concerning the normal development of the visual system.
A. All layers of the cortex contain some binocular cells at birth.
B. Axons from the lateral geniculate to the visual cortex make and break synaptic
connections both before and after birth.
C. NMDA receptors contribute to stabilization of active synapses by admitting glutamate
into dendrites of cortical cells.
D. Prior to birth, ganglion cells in both eyes fire simultaneously.
E. The first two choices are true.
E.
Concerning the processing of sound by the auditory system:
the location of a sound source is determined by the timing and intensity of sound
information
What is NOT true of the smallest motor units:
They have FF muscle fibers.
Comparing alpha and gamma motoneurons
The motoneuron pool consists of both alpha and gamma motoneurons innervating a
particular muscle.
T/F: the larger the motoneuron, the greater the number of muscle fibers it innervates.
True
The basal ganglia and cerebellum are similar in that both:
use the ventral lateral nucleus of thalamus as a relay back to cortex
