True or False

Determine which five of the following statements are false, and briefly explain why.

  1. A neuron never has more than one axon.
  2. Oligodendrocytes perform the same function in the brain as Schwann cells do in the peripheral nerves.
  3. A resting neuron has a higher concentration of K+ in its cytoplasm than in the extracellular fluid surrounding it.
  4. During an action potential, a neuron is repolarized by the outflow of sodium ions.
  5. Excitatory postsynaptic potentials lower the threshold of a neuron and thus make it easier to stimulate.
  6. The absolute refractory period sets an upper limit on how often a neuron can fire.
  7. A given neurotransmitter has the same effect no matter where in the body it is secreted.
  8. Nerve signals travel more rapidly through the nodes of Ranvier than through the internodes.

Saladin: Anatomy & I 12. Nervous Tissue I Text I I © The McGraw-Hill

Physiology: The Unity of Companies, 2003 Form and Function, Third Edition

Chapter 12 Nervous Tissue 479

  1. The synaptic contacts in the nervous system are fixed by the time of birth and cannot be changed thereafter.
  2. Mature neurons are incapable of mitosis.

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