Md 2 Ns Test Questions

Front 1

1. Common circuit motifs that mediate the spinal stretch reflex include all of the following EXCEPT
A.Feedforward excitation
B. Feedforward inhibition
C.Fedback inhibition
D.Lateral inhibition
E .Divergence

Back 1

D.Lateral inhibition

Front 2

2. The process by which a neuron summates synaptic excitation and inhibition is called:
A.Plasticity
B.Integration
C.Convergence
D.Pulse frequency modulation
E.Disinhibition

Back 2

B.Integration

Front 3

3. The network motif that underlines circadian rhythm is:
A.Temporal summation
B.Spatial summation
C. Feedback inhibition
D Feedback excitation
E. D.Lateral inhibition

Back 3

C. Feedback inhibition

Front 4

4. An autoassociation network is important for:
A. Reflexes
B.Edge enhancement
C.Memory
D.Locomotion
E.Neuronal oscillations

Back 4

Memory

Front 5

If a nerve membrane suddenly became equally permeable to both Na+ and K+, the membrane potential would:

Back 5

Approach a value of about 0 mV

Front 6

If the concentration of K+ in the cytoplasm of an invertebrate axon is changed to a new value of 200 mM (Note: for this axon normal [K]o = 20 mM and normal [K]i = 400 mM):

Back 6

K+ equilibrium potential would be about -60 mV

Front 7

Drug X, when applied to a nerve axon, results in both a gradual decrease in the amplitude of individual action potentials and a depolarization of the resting potential, both of which develop over a period of several hours. The drug is most likely:

Back 7

Blocking the (Na+ -K+) pump

Front 8

1.Which of the following statesments concerning development of the nervous system is correct?
A. A longitudinal band of endoderm thickens to form the neural plate

B. Neural crest cells brake away from the neural tube to form peripheral neural structures

C. Secondary vesicles that arise from the rhombencephalon becvome the pons and medula

D. The cerebellum develops from the myelencephalon

E. The telencephalon develops into the thalamus and hypothalamus

Back 8

Secondary vesicles that arise from the rhombencephalon becvome the pons and medula

Front 9

A 23-year-old woman was unconscious when admitted to
the emergency department. While crossing the road, she had been hit on the side of the head by a bus. Within an hour, she was found to have a large dough-like swelling over the right temporal region. She also had signs of muscular paralysis on the left side of the body. A lateral radiograph of
the skull showed a fracture line running downward and for
ward across the anterior inferior angle of the right parietal bone. Her coma deepened, and she died 5 hours after the
accident

What is the cause of the swelling over the right temporal region in this patient

What is the cause of the muscular paralysis of the left side of the body in this patient

Back 9

Rupture of the right middle meningeal vessels

Right-sided epidural hemorrhage