The myelin sheath around axons in the CNS is formed by:
A. Astrocytes
B. Schwann cells
C. Microglia
D. Oligodendrocytes
Answer: Option D
Solution (By JKSSB Mock Tests)
In the central nervous system, oligodendrocytes wrap axons forming the myelin sheath. In the peripheral nervous system, Schwann cells perform this function.
Explanation:
The Eustachian (auditory) tube connects the nasopharynx to the middle ear, allowing pressure equalization across the eardrum. The cochlea is for hearing, semicircular canals for balance.
Explanation:
Fucoxanthin is a carotenoid that masks the green chlorophyll in brown algae (Phaeophyceae). Phycoerythrin is red, phycocyanin blue, chlorophyll b green.
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