1. What structures are present exclusively within the myelin sheath of the PNS?

Question

1. What structures are present exclusively within the myelin sheath of the PNS?

A. neurilemma

B. nodes of ranvier

C. myelin

D. Both neurilemma and sheath of Schwann are correct

2.Which type of neurological cell supports the metabloic needs of the blood-brain barrier?

A. oligodendrocytes

B. Schwann cells

C. microglia

D. ependymal cells

E. astrocytes

3. Which of the following is/ are roles of astrocytes in the formation and function of the blood-brain barrier?

A. induce tight junctions between capillary endothelial cells

B. production of carrier proteins and ion channels

C. produces enzymes to destroy toxic substances

D. All of the choices are correct

4. When the threshhold is reached in a neuron, depolarization occurs with the same amplitude of potential change. This is known as

A. the All-or-None Law.

B. cable properties of axons.

C. a graded response.

D. salutatory conduction.

5. The period of time when a membrane cannot respond to another stimulus, no matter how strong, is the

A. relative refractory period.

B. All-or-None period

C. absolute refractory period.

D. after-potential period.

6. What structures are involved in electrical synapses?

A. tight junctions

B. gap junctions

C. desmosomes

D. microvilli

Explanation / Answer

1. D. Both neurolemma and sheath of Schwann are correct

2. E. astrocytes

3. D. All of the choices are correct

4. C. a graded response

5. C. absolute refractory period

6. B. gap junctions

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