Question 22

Microglial cells help in immune surveillance and phagocytosis.

Microglial cells are specialized glial cells in the central nervous system that play a crucial role in immune surveillance and phagocytosis, effectively acting as the first line of defense against pathogens and debris.

A) Microglial cell

Microglial cells are the primary immune cells of the central nervous system. They constantly monitor the environment for signs of infection or injury and can engulf and digest cellular debris through phagocytosis, making them essential for maintaining the health of neural tissue.

B) Astrocyte

Astrocytes are another type of glial cell that provide structural support, regulate blood flow, and contribute to the blood-brain barrier. While they play a role in supporting neuronal function and maintaining homeostasis, they do not primarily engage in immune surveillance or phagocytosis.

C) Oligodendrocytes

Oligodendrocytes are responsible for myelinating axons in the central nervous system, which is vital for efficient signal transmission. However, they do not have a role in immune surveillance or phagocytosis, focusing instead on supporting neuronal insulation and signaling.

D) Ependymal cells

Ependymal cells line the ventricles of the brain and the central canal of the spinal cord, contributing to the production and circulation of cerebrospinal fluid. They do not participate in immune surveillance or phagocytosis, thus are not involved in the immune response.

Conclusion

Microglial cells are the only glial cells listed that perform immune surveillance and phagocytosis, distinguishing them from astrocytes, oligodendrocytes, and ependymal cells, which have different primary functions. This specificity in function underscores the importance of microglial cells in maintaining central nervous system health and responding to injury or infection.