What Would Be the Best Explanation for Why Myelinated Fibers

question 72

Multiple Choice

What would be the best explanation for why myelinated fibers conduct signals faster than unmyelinated fibers?

• A) There are no internodes in unmyelinated fibers.
• B) There are more internodes in unmyelinated fibers.
• C) Facilitated diffusion of sodium and potassium is faster in myelinated fibers.
• D) Active transport of sodium and potassium is faster in myelinated fibers.
• E) Diffusion of ions along the axoplasm is faster.

---

Definitions:

Parasympathetic

The branch of the autonomic nervous system that conserves energy as it slows the heart rate, increases intestinal and gland activity, and relaxes sphincter muscles.

Forebrain

The anterior part of the brain that includes the cerebral hemispheres, thalamus, and hypothalamus, important for complex behaviors, emotion, memory, and thought.

Cerebellum

A region of the brain that plays a significant role in motor control, and also contributes to cognitive functions such as attention and language.

Corpus Callosum

A wide band of neural fibers beneath the cortex in the human brain, facilitating communication between the two hemispheres.