Question

cells of nervous system
select the correct term from the choices given and write the letter in the answer blank.
(a) neurons (b) neuroglia
_____ 11. axon
_____ 12. special type of supporting cells
_____ 13. astrocytes
_____ 14. sensory
_____ 15. conduct impulses
_____ 16. forms the myelin sheath around central nerve fibers
_____ 17. phagocytosis
_____ 18. efferent
_____ 19. multiple sclerosis
_____ 20. neurilemma

Explanation:

1. Axons are part of neurons (A) as neurons have axons for transmitting signals.
2. Neuroglia (B) are the supporting cells of the nervous system.
3. Astrocytes are a type of neuroglia (B).
4. Sensory neurons (A) are a type of neuron.
5. Neurons (A) conduct electrical impulses.
6. Oligodendrocytes (a type of neuroglia, B) form myelin sheaths in the central nervous system.
7. Microglia (neuroglia, B) perform phagocytosis.
8. Efferent neurons (A) carry signals away from the central nervous system.
9. Multiple sclerosis affects myelin (related to neuroglia - oligodendrocytes, B) but also impacts neurons; however, the primary cells involved in myelin production here (oligodendrocytes) are neuroglia, so B.
10. Neurilemma is associated with Schwann cells (neuroglia - in PNS, B) and also neurons? Wait, neurilemma is the outer layer of Schwann cells (neuroglia) around peripheral nerve fibers, but neurons have axons with neurilemma. Wait, correction: Neurons (A) have axons with neurilemma (Schwann cells - neuroglia) but the neurilemma is part of the neuron's axon covering. Wait, actually, neurilemma is the sheath of Schwann cells (neuroglia) around a peripheral nerve fiber, but the question is about which cell type (neurons or neuroglia) is related. Wait, maybe I made a mistake. Let's re - check:

• 11. Axon: part of neuron (A)
• 12. Supporting cells: neuroglia (B)
• 13. Astrocytes: neuroglia (B)
• 14. Sensory: neurons (A) (sensory neurons)
• 15. Conduct impulses: neurons (A)
• 16. Myelin sheath in CNS: oligodendrocytes (neuroglia, B)
• 17. Phagocytosis: microglia (neuroglia, B)
• 18. Efferent: neurons (A) (efferent neurons)
• 19. Multiple sclerosis: affects myelin (oligodendrocytes - neuroglia, B)
• 20. Neurilemma: associated with Schwann cells (neuroglia, B) around peripheral neurons, but the neurilemma is the outer layer of Schwann cells (neuroglia) on the neuron's axon. So B? Wait, no, neurons have axons with neurilemma (Schwann cells - neuroglia). But the question is which cell type (A or B) is related. Maybe the answer for 20 is A? Wait, I think I messed up. Let's use standard knowledge:
• Neurons (A) are the functional cells, neuroglia (B) are support.
• Axon: A
• Supporting cells: B
• Astrocytes: B
• Sensory: A (sensory neurons)
• Conduct impulses: A
• Myelin in CNS: B (oligodendrocytes)
• Phagocytosis: B (microglia)
• Efferent: A (efferent neurons)
• Multiple sclerosis: B (affects myelin produced by oligodendrocytes)
• Neurilemma: B (Schwann cells, neuroglia, form neurilemma around peripheral axons)

Answer:

1. A. Neurons
2. B. Neuroglia
3. B. Neuroglia
4. A. Neurons
5. A. Neurons
6. B. Neuroglia
7. B. Neuroglia
8. A. Neurons
9. B. Neuroglia
10. B. Neuroglia