True or False
Determine which five of the following statements are false, and briefly explain why.
- A neuron never has more than one axon.
- Oligodendrocytes perform the same function in the brain as Schwann cells do in the peripheral nerves.
- A resting neuron has a higher concentration of K+ in its cytoplasm than in the extracellular fluid surrounding it.
- During an action potential, a neuron is repolarized by the outflow of sodium ions.
- Excitatory postsynaptic potentials lower the threshold of a neuron and thus make it easier to stimulate.
- The absolute refractory period sets an upper limit on how often a neuron can fire.
- A given neurotransmitter has the same effect no matter where in the body it is secreted.
- 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
- The synaptic contacts in the nervous system are fixed by the time of birth and cannot be changed thereafter.
- Mature neurons are incapable of mitosis.
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