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chapter quiz

1. Dendrites and axons are both armlike processes that extend from cell bodies

true

2. What is the primary difference between the somatic nervous system and the autonomic nervous system?

The somatic nervous system allows us to consciously control our skeletal muscles, and the autonomic nervous system controls activity that humans cannot consciously control, such as the pumping of the heart and the movement of food through the digestive tract.

3. Which of the following diseases is directly related to demyelination?

Multiple sclerosis

4. Which of the following is not a structural classification of neurons?

Nonpolar

5. What is the difference between nerves and tracts?

Bundles of neuron processes are called tracts in the CNS and nerves in the PNS.

6. An action potential is a phenomenon that either happens completely or doesn't happen at all.

true

7. Which of the following types of glial cells are the most abundant and versatile, and aid in making exchanges between capillaries and neurons?

Astrocytes

8. Which of the following are the main receptive or input regions found in neurons?

Dendrites

9. Which of the following is not a functional classification of neurotransmitters?

Intracellular

10.Which of the following types of glial cells line the central cavities of the brain and spinal cord, where they help to circulate the cerebrospinal fluid?

Ependymal cells

11. Which of the following is not a function of the myelin sheath?

To aid in the regeneration of damaged nerve fibers

12. What is the difference between the clusters of cell bodies called nuclei and those known as ganglia?

Nuclei exist in the CNS, ganglia in the PNS.

13. Which of the following is not true of chemical synapses?

They transmit nerve impulses directly from one neuron to another.

14. Which of the following is not true of efferent neurons?

Efferent neurons are bipolar.

15. Which of the following best describes the concept of integration?

The nervous system processes and interprets sensory input and decides what should be done at each moment.

16. Which criterion is used to structurally classify neurons?

The number of processes extending from their cell body.

17. Which of the following circuit types is exemplified by impulses that travel from a single neuron of the brain, activate a hundred or more motor neurons in the spinal cord, and excite thousands of skeletal muscle fibers?

Diverging circuits

18. Which of the following is not a characteristic of neurons?

Neurons are relatively small, simple-structured cells.

19. Which of the following membrane ion channels open and close in response to changes in the membrane potential?

Voltage-gated channels

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