Question

question 27
the ____ of a neuron is a single process that usually extends from a tapered portion of the cell body.
dendrite
neurofibril
axon
nissl body
question 28
a signal conduction route to and from the central nervous system is a(n)
reflex arc.
afferent pathway.
efferent pathway.
feedback loop.
question 29
what structure of the schwann cell is essential to normal nerve growth and the regeneration of injured nerve fibers?
myelin sheath
node of ranvier
neurilemma
telodendria

Explanation:

• Question 27: Neurons have different parts. The axon is a single - long process extending from the cell body. Dendrites receive signals, neurofibrils are structural elements, and Nissl bodies are related to protein synthesis.
• Question 28: A reflex arc is a complete signal - conduction route to and from the central nervous system, including sensory and motor components. Afferent pathways carry signals to the CNS, efferent pathways carry signals away from the CNS, and a feedback loop is a regulatory mechanism.
• Question 29: The neurilemma of the Schwann cell is important for nerve growth and regeneration of injured nerve fibers. The myelin sheath insulates axons, nodes of Ranvier aid in signal conduction, and telodendria are terminal branches.

Answer:

• Question 27: C. axon
• Question 28: A. reflex arc
• Question 29: C. neurilemma