Figure 11-1 
-Refer to Figure 11-1. Which of the following items is not a clear-cut example of the type of good represented by Box A?
Definitions:
Astrocytes
Star-shaped glial cells in the brain and spinal cord that play a crucial role in supporting neurons, forming blood-brain barrier, and regulating neurotransmitters.
Schwann Cells
Specialized cells in the peripheral nervous system responsible for the formation of myelin, which speeds up the electrical impulses in neurons.
Ependymal Cells
Glial cells that line the ventricles of the brain and the spinal cord, involved in the production of cerebrospinal fluid.
Glial Cells
Glial cells, or neuroglia, are non-neuronal cells in the central and peripheral nervous systems that support and protect neurons.
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