Q: Which of the following equations best represents the relationship between axon diameter, myelination, and conduction velocity?

$$v \propto d \times m$$, where $$v is $$conduction velocity, $$d is $$axon diameter, and $$m is $$degree of myelination$

Question 1

Which of the following statements best describes the Neuron Doctrine?

Accepted Answer

The brain is composed of metabolically, structurally, and functionally independent cells, and information is transmitted across synapses.

Question 2

Which type of neuron is most likely to be found connecting the brain and spinal cord to muscles for movement?

Accepted Answer

Motor neuron

Question 3

What is the primary function of myelin in the nervous system?

Accepted Answer

To increase transmission speed and improve energy efficiency of action potentials along axons

Question 4

Which glial cell type is responsible for forming myelin sheaths in the central nervous system (CNS)?

Accepted Answer

Oligodendrocytes

Question 5

A patient with multiple sclerosis (MS) is experiencing demyelination in the CNS. Which cell type is being attacked by the immune system?

Accepted Answer

Oligodendrocytes

Question 6

Which of the following best describes the direction of an action potential in a typical neuron?

Accepted Answer

From dendrite to axon terminal

Question 7

Which protein is responsible for anterograde axonal transport, moving vesicles from the soma to the axon terminal?

Accepted Answer

Kinesin

Question 8

What is the function of dendritic spines?

Accepted Answer

To increase the surface area for synaptic input and facilitate neural plasticity

Question 9

Which of the following is true about the somatic nervous system?

Accepted Answer

It connects the brain with muscle and sensory systems and is mostly voluntary.

Question 10

Which of the following equations best represents the relationship between axon diameter, myelination, and conduction velocity?

Accepted Answer

$$v \propto d 	imes m$$, where $$v is $$conduction velocity, $$d is $$axon diameter, and $$m is $$degree of myelination$

Question 11

Which of the following best describes the role of astrocytes?

Accepted Answer

They receive neuronal input, monitor synaptic activity, and regulate blood flow.

Question 12

Which structure is responsible for determining whether a neuron will fire an action potential?

Accepted Answer

Axon hillock

Question 13

Which of the following is a correct sequence of neuronal communication?

Accepted Answer

Neurotransmitter binds to receptors on dendrites/soma, action potential generated at axon hillock, action potential travels down axon, neurotransmitter released at terminal

Question 14

Which glial cell type is most involved in removing debris from injured cells and remodeling neural connections?

Accepted Answer

Microglial cells

Question 15

Which of the following best describes the function of the autonomic nervous system?

Accepted Answer

It controls visceral organs and glands, and is not under voluntary control.

Question 16

Which of the following is a characteristic of the sympathetic division of the autonomic nervous system?

Accepted Answer

It uses norepinephrine and acetylcholine as neurotransmitters and prepares the body for 'fight or flight'.

Question 17

Which of the following is true about synaptic vesicles?

Accepted Answer

They contain neurotransmitters and release them into the synaptic cleft in response to electrical signals.

Question 18

Which of the following best explains why myelinated axons conduct action potentials faster than unmyelinated axons?

Accepted Answer

Myelin insulates the axon, allowing action potentials to jump between nodes of Ranvier (saltatory conduction).

Question 19

Which of the following is a function of the enteric division of the autonomic nervous system?

Accepted Answer

Regulation of digestion and gut function

Neuroanatomy: Structure and Function of Neurons and Nervous Systems

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