The cell type responsible for producing myelin in the peripheral nervous system is:
A. Astrocyte
B. Microglia
C. Oligodendrocyte
D. Schwann cell
Answer: Option D
Solution (By JKExamLibrary)
Schwann cells wrap around axons in the PNS to form myelin sheaths. Oligodendrocytes myelinate axons in the CNS. Astrocytes support neurons, microglia are immune cells.
Explanation:
The medulla oblongata contains the respiratory rhythmicity centre that controls the rate and depth of breathing. The pons also has pneumotaxic and apneustic centres influencing breathing. The cerebrum can exert voluntary control, cerebellum coordinates movement, and hypothalamus regulates homeostasis.
Explanation:
Acromegaly is the enlargement of bones and soft tissues due to overproduction of growth hormone in adults after growth plates have fused. Gigantism occurs in childhood, dwarfism GH deficiency, cretinism congenital hypothyroidism.
Consider statements about human diseases: 1. Cholera is a bacterial disease. 2. Polio is a viral disease. 3. Malaria is transmitted by a mosquito. Which are correct?
Explanation:
Cholera is an acute diarrheal illness caused by the bacterium Vibrio cholerae, typically transmitted through contaminated water. Polio (poliomyelitis) is a highly infectious viral disease caused by the poliovirus, which can lead to paralysis. Malaria is a life-threatening disease caused by Plasmodium parasites, which are transmitted to humans through the bites of infected female Anopheles mosquitoes. All three statements are correct.
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