Question

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Neurons are the functional cells in brain. Glial cells are the supporting cells of the brain. Reason (R): Astroglia are star-shaped neuronal cells. In the light of the above statements, choose the most appropriate answer from the options given below:

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A) \
• B. Both (A) and (R) are correct but (R) is not the correct explanation of (A) \
• C. (A) is correct but (R) is not correct \
• D. (A) is not correct but (R) is correct

Hint:

Astrocytes = "Astro" (star) + "cyte" (cell). They belong strictly to the glial lineage, totally separate from neurons!

Answer 1

The Correct Option is C

Step 1: Concept The nervous system is composed of two primary broad classes of cellular entities: neurons, which propagate electrical signals, and neuroglia (glial cells), which provide homeostatic maintenance and structural integrity.

Step 2: Meaning Astroglia (astrocytes) are a specific type of glial support cells characterized by numerous radiating star-like cytoplasmic processes.

Step 3: Analysis * Assertion (A) is correct: Neurons serve as the primary functional electrical-signaling network components, whereas glial cells provide crucial physiological support, insulation, and waste management. * Reason (R) is incorrect: While astroglia are indeed star-shaped, they are fundamentally classified as glial cells, not neuronal cells. Glial cells do not propagate action potentials in the manner that neurons do.

Step 4: Conclusion Because Assertion (A) is physiologically true but Reason (R) contains an inaccurate categorical classification, option C is correct. Final Answer: (C)