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B
Chondroblasts
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C
Osteoblasts
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D
Gland cells
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Solution
The correct option is A Neurons Schwann cell are cells in the peripheral nervous system that synthesize the myelin sheath around neuronal axons. Node of Ranvier are the periodic gap in the insulating myelin sheath on the axon of neurons that bring about the rapid conduction of nerve impulses. Thus the correct answer is option A.