Also events at one node thus create excitation at the

 Also, events at one node thus create excitation at the next node some distance away
o Summary:
 Saltatory conduction: based on a process that is very fast in the internodes (transfer of
energy from ion to ion), but decremental
 I.e., conduction is slower but non-decremental
 Since most of the axon is covered with myelin, conduction occurs mainly by the fast
internodal process
 This is why myelinated fibers conduct signals much faster (up to 120 m/s) than
unmyelinated ones (up to 2 m/s)
Quiz 1 – 6/30/21
• Which of the following organs would be innervated by the somatic division of the nervous system?
o The interstitial fluid
o The liver
o The kidneys
o The biceps muscle
o The stomach
• Which of the following examples below would be innervated by the visceral motor division of the nervous
system?
o

Lecture notes 6/28 Lecture notes 6/29 Lecture notes 6/30 Lecture notes 7/1 Lecture notes 7/2 Quizzes & tests
o A leg muscle contraction
• Which of the following neurons contain their somas in the central nervous system?
• T/F: The neurosoma lacks Nissl bodies, which are an important component of mitosis, and limits its ability
to undergo cellular division
• __________ neurons provide sensory information to the head, while __________ neurons provide sensory
information to the skin and organs.
o Bipolar, Unipolar
o Unipolar, Bipolar
o Bipolar, Bipolar
o Multipolar, Bipolar
• ___ is the most highly concentrated cation in the extracellular fluid, while __ is the most highly
concentrated cation in the intracellular fluid.
• Which of the following reasons explains why the resting membrane potential exists?