Questions: Question 23 (U. b points) It's a good thing those signals travel to your legs so quickly. What substance makes signals travel so quickly? Schwann cells Meninges Myelin Dopamine Question 24 ( 0.5 points) What neuroglial cells are involved in this process? Schwann Ganglia Sympathetic Multipolar Neurons

Question 23:
The answer is the third one: Myelin.
Explanation:

• Schwann cells: These cells produce myelin in the peripheral nervous system, but they are not the substance itself.
• Meninges: These are protective coverings of the brain and spinal cord, not involved in signal transmission speed.
• Myelin: This is the substance that insulates nerve fibers, allowing electrical signals to travel quickly along the axon.
• Dopamine: This is a neurotransmitter, not involved in the speed of signal transmission.

Question 24:
The answer is the first one: Schwann.
Explanation:

• Schwann: These cells are responsible for the production of myelin in the peripheral nervous system, which is crucial for rapid signal transmission.
• Ganglia: These are structures containing nerve cell bodies, not directly involved in myelination.
• Sympathetic: This refers to a part of the autonomic nervous system, not specific cells involved in myelination.
• Multipolar Neurons: These are a type of neuron, not neuroglial cells involved in myelination.

In summary, myelin is the substance that allows signals to travel quickly, and Schwann cells are the neuroglial cells involved in this process.