3.7 PEx: Neurophysiology of Nerve Impulses part 1

Part A

Which of the following is described correctly?
    Oligodendrocytes provide the myelination in the peripheral nervous system.
    Schwann cells provide the myelination in the central nervous system.
    Astrocytes provide the myelination in the central nervous system.
    Schwann cells provide the myelination in the peripheral nervous system.

Part B

The rate with which an action potential travels along an axon _______.
    is measured in volts/sec
    is called the conduction velocity and is measured in meters/sec
    is called the conduction velocity
    is measured in meters/sec
    is called the conduction velocity and is measured in volts/sec

Part C

Which of the following describes a B fiber?
    medium diameter, lightly myelinated
    small diameter, lightly myelinated
    large diameter, lightly myelinated
    small diameter, unmyelinated

Part D

The nodes of Ranvier are _______.
    trigger zones of an axon
    a type of glial cell
    locations on the axon where the myelin sheath is absent
    locations on the axon where the myelin sheath is very heavy