Bms 333 Exam 2 Neuro

13 Questions | By Kehamilt | Last updated: Mar 21, 2022 | Total Attempts: 82

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1.

Which of the following best describes a neuron at the resting state?
- A.
  
  Na+-K+ ATPase pumps are not active
- B.
  
  The resting membrane potential is about +65 mV
- C.
  
  K+ ions leak out of a neuron via nongated K+ channels
- D.
  
  Voltage-gated K+ channels are open
- E.
  
  The resting state represents the relative refractory period
2.

A local anesthetics, lidocane, prevents generation of action potential by inactivating:
- A.
  
  Receptors for gamma aminobutylic acid (GABA)
- B.
  
  Nongated Na+ channels
- C.
  
  Voltage-gated Ca++ channels
- D.
  
  Voltage-gated Na+ channels
- E.
  
  Release of neurotransmitter Ach
3.

Astrocytes:
- A.
  
  Form choroid plexus that produce cerebrospinal fluid
- B.
  
  Transport glucose from capillaries to neurons
- C.
  
  Give rise to perivascular end feet in the dorsal root ganglion
- D.
  
  Stop dividing shortly after birth
- E.
  
  Promote intercellular accumulation of neurotransmitter glutamate
4.

A lesion of the lateral funiculus is likely to affect:
- A.
  
  Central canal
- B.
  
  Neuronal perikarya
- C.
  
  Ependymal cells
- D.
  
  Schwann cells
- E.
  
  Oligodendrocytes
5.

When an excitatory synapse 'A' and inhibitory synapse 'B' are stimulated simultaneously, the postsynaptic neuron is likely to generate:
- A.
  
  An excitatory postsynaptic potential only
- B.
  
  An inhibitory poststynaptic potential only
- C.
  
  No obvious overall changes in membrane potential
- D.
  
  Hyperpolarizing potential
- E.
  
  An action potential
6.

What do you expect to see in a dog with a large lesion affecting the intermediate substance of teh spinal cord?
- A.
  
  Presence of quadriceps reflex
- B.
  
  Absence of quadriceps reflex
7.

Demyelination of axon is likely to result in:
- A.
  
  Slight increase in conduction velocity of action potential
- B.
  
  Decreased conduction velocity to the speed typically seen in nonmyelinated nerve fibers
- C.
  
  A loss of conduction of action potentials as local currents cannot reach the voltage-gated Na+ and K+ channels
- D.
  
  Increased conduction velocity due to a loss of resistance imposed by axonal plasma membrane
- E.
  
  No apparent change in conduction speed as voltage-gated Na+ and K+ channels are still available in the demyelinated area
8.

Which of the following is affected in a dog with tic paralysis?
- A.
  
  Sensory neurons in the dorsal horn
- B.
  
  Postsynaptic acetycholine receptors
- C.
  
  Release of Ach at the neuromuscular junction
- D.
  
  Release of glycine from the pre-synaptic site
- E.
  
  Motor neurons in the ventral horn
9.

Which statement is true about the neuromuscular synapse?
- A.
  
  Nerve fibers that form the neuromuscular synapse leave the spinal cord via the dorsal root
- B.
  
  Terminal branches of the motor end plate release glutamate
- C.
  
  Neuromuscular synapse is affected by myasthenia gravis
- D.
  
  Postsynaptic membrane has receptors for gamma aminobutylic acid (GABA)
- E.
  
  Axon terminals are covered with astrocytes
10.

The pointed portion (depolarization) of an action potential is triggered by:
- A.
  
  Inhibitory postsynaptic potentials
- B.
  
  Na+-K+ ATPase pumps
- C.
  
  Opening of voltage-gated K+ channels
- D.
  
  Inactivation of voltage-gated Na+ channels
- E.
  
  Activation of voltage-gated Na+ channels
11.

Which neurotransmitter generates excitatory postsynaptic potential (EPSP) that depolarizes the postsynaptic membrane during synaptic transmission?
- A.
  
  Glycine
- B.
  
  Ach
- C.
  
  GABA
- D.
  
  All of the above
12.

A nerve fiber is:
- A.
  
  Made of an axon and endoneurium
- B.
  
  Made of an axon and Schwann cells
- C.
  
  Made of a myelinated axon and endoneurium
- D.
  
  Made of a nerve fasicle surrounded by perineurium
- E.
  
  Made of an axon and oligodendrocytes
13.

For inhibitory graded potential (IPSP) to occur during synaptic transmission, an inhibitory neurotransmitter must bind to the:
- A.
  
  Ligand-gated receptors to trigger influx of Cl-
- B.
  
  Ligand-gated receptors to trigger influx of Na+
- C.
  
  Voltage-gated Na+ channels to trigger influx of Na+
- D.
  
  Voltage-gated K+ channels to trigger influx of K+