MCQ
Myelin sheath is produced by ______________:
- ANeurons
- BNissl's granules
- CSchwann cells
- DNone of the above
Explanation:
Schwann cells makes myelin in the peripheral nervous system (PNS: nerves) and oligodendrocytes in the central nervous system (CNS: brain and spinal cord). In the PNS, one Schwann cell forms a single myelin sheath.
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$a -$ Nuclear envelope assembles around chromosomes clusters.
$b -$ Spindle fibers attach to kinetochores of chromosomes.
$c-$ Condensation of chromosomes.
$d -$ Centromeres split and chromatids separate.
| List $- I$ | List $- II$ |
| $(a)$ Scapula | $(i)$ Cartilaginous joints |
| $(b)$ Cranium | $(ii)$ Flat bone |
| $(c)$ Sternum | $(iii)$ Fibrous joints |
| $(d)$ Vertebral column | $(iv)$ Triangular flat bone |
Choose the correct answer from the options given below.
$(a)- (b) -(c) -(d)$