Q from Quiz 2

Question 1

The interior of the cell becomes less negative due to an influx of sodium ions.

Answer 1

Depolarization 
Absolute refractory period 
Repolarization 
Action potential 
Relative refractory period

Question 2

Which of the following is not true of graded potentials? (Select all that apply)

They increase amplitude as they move away from the stimulus point.
They can form on receptor endings.
They can be called postsynaptic potentials.
They are short-lived.

Answer 2

They can form on receptor endings.
They can be called postsynaptic potentials.
They are short-lived.

Question 3

An inhibitory postsynaptic potential (IPSP) is associated with ________

hyperpolarization
lowering the threshold for an action potential to occur
opening of voltage-regulated channels
a change in sodium ion permeability

Answer 3

hyperpolarization

Question 4

What are ciliated CNS neuroglia that play an active role in moving the cerebrospinal fluid called?

astrocyte
Schwann cells
oligodendrocytes
ependymal cells

Answer 4

ependymal cells

Question 5

T/F A postsynaptic potential is a graded potential that is the result of a neurotransmitter released into the synapse between two neurons.

Answer 5

False

Question 6

Which of the following will occur when an excitatory postsynaptic potential (EPSP) is being generated on the dendritic membrane?

A single type of channel will open, permitting simultaneous flow of sodium and potassium.
Specific potassium gates will open.
Specific sodium gates will open.
Sodium gates will open first, then close as potassium gates open.

Answer 6

A single type of channel will open, permitting simultaneous flow of sodium and potassium.

Question 7

Numerous nerve impulses arriving at a synapse at closely timed intervals exert a cumulative effect.

Threshold stimulus
Temporal summation
Spatial summation
Subthreshold stimulus

Answer 7

Temporal summation

Question 8

A person who suffered a stroke will have which type of cell become active in the area of the brain where the stroke occurred?
  microglia cells 
  Schwann cells 
  satellite cells 
  ependymal cells 
  oligodendrocyte cells 
  astrocyte cells

Answer 8

microglia cells

Question 9

A reflex that causes muscle relaxation and lengthening in response to muscle tension is called a ________.

crossed-extensor reflex
plantar reflex
flexor reflex
Golgi tendon reflex

Answer 9

Golgi tendon reflex

Question 10

Loss of ability to perform skilled motor activities such as piano playing, with no paralysis or weakness in specific muscles, might suggest damage to the ________

premotor cortex
rubrospinal tracts
spinal cord
primary motor cortex

Answer 10

premotor cortex

Question 11

T/F The only cranial nerves to extend beyond the head and neck region are the vagus nerves.

Answer 11

True

Question 12

Which of the following structures is probably not directly involved in memory?

medulla
hippocampus
thalamus
prefrontal cortex

Answer 12

medulla

Question 13

Visceral reflex arcs differ from somatic in that _____

visceral arcs contain two sensory neurons
somatic arcs contain one additional component that visceral arcs do not possess
visceral arcs involve two motor neurons
visceral arcs do not use integration centers

Answer 13

visceral arcs involve two motor neurons

Question 14

An individual accidentally transected the spinal cord between T1and L1. This would result in ________

spinal shock only
quadriplegia
paraplegia
hemiplegia

Answer 14

paraplegia

Question 15

Spastic paralysis suggests involvement of the ________

spinal nerve roots
neuromotor junction
upper motor neurons
lower motor neurons

Answer 15

upper motor neurons