QQuestionBiology
QuestionBiology
"Choose the correct statement about myelin.
A. It is best not to give children under two years of age a low-fat diet because myelin formation requires lipids.
B. It is formed by oligodendrocytes in the peripheral nervous system and Schwann cells in the central nervous system.
C. It is about 80% protein and 20% lipid.
D. The myelin sheath is segmented, and the gaps between the segments are called internodes."
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Answer
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Step 1:Let's solve this step by step:
Step 2:: Understand Myelin
Myelin is a fatty substance that forms an insulating layer around nerve fibers (axons) in the nervous system. It helps speed up electrical impulses along nerve cells.
Step 3:: Analyze Option A
This statement is TRUE. Myelin formation requires significant lipids, and young children need fat in their diet for proper neurological development. Restricting fat intake can interfere with myelin formation.
Step 4:: Analyze Option B
This statement is INCORRECT. - Oligodendrocytes form myelin in the CENTRAL nervous system (brain and spinal cord) - Schwann cells form myelin in the PERIPHERAL nervous system (nerves outside brain and spinal cord)
Step 5:: Analyze Option C
This statement is INCORRECT. Myelin is actually composed of approximately: - 80% lipid - 20% protein The statement reverses these percentages.
Step 6:: Analyze Option D
This statement is TRUE. The myelin sheath is indeed segmented, with gaps between segments called nodes of Ranvier (internodes). These gaps allow faster signal transmission through saltatory conduction.
Final Answer
It accurately describes the importance of lipids in myelin formation, especially for young children's neurological development.
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