Astroglial cells:
Correct answer: B. Form the myelin of CNS neurons
- A. Form cerebrospinal fluid
- B. Form the myelin of CNS neurons
- C. Are phagocytic
- D. Form a part of the blood-brain barrier
Explanation
Astrocytes do not form the myelin sheath around axons in the central nervous system (CNS). Oligodendrocytes, another type of glial cell in the CNS, are responsible for producing myelin and insulating axons to facilitate the rapid transmission of electrical impulses. Astrocytes play a supportive role in the CNS by providing structural support, regulating the extracellular environment, and contributing to synaptic function, but they do not produce myelin.
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About Coordination and Control
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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