Q: Which equation correctly represents the calculation of the resting membrane potential using the Nernst equation?

$$E = \frac{RT}{zF} \ln \left( \frac{[\text{ion}]_{\text{out}}}{[\text{ion}]_{\text{in}}} \right)$$

Question 1

Which of the following best describes a key functional difference between the central nervous system (CNS) and the peripheral nervous system (PNS)?

Accepted Answer

The CNS integrates and processes information, while the PNS transmits signals between the CNS and the rest of the body.

Question 2

Which of the following is TRUE regarding the blood-brain barrier?

Accepted Answer

It is formed by astrocytes and tight junctions between endothelial cells.

Question 3

A patient presents with loss of fine touch sensation but retains pain and temperature sensation. Which spinal tract is most likely damaged?

Accepted Answer

Dorsal column-medial lemniscal pathway

Question 4

Which equation correctly represents the calculation of the resting membrane potential using the Nernst equation?

Accepted Answer

$$E = \frac{RT}{zF} \ln \left( \frac{[	ext{ion}]_{	ext{out}}}{[	ext{ion}]_{	ext{in}}} ight)$$

Question 5

Which of the following best explains the difference between myelinated and unmyelinated axons in terms of action potential propagation?

Accepted Answer

Myelinated axons use saltatory conduction, allowing action potentials to jump between nodes of Ranvier.

Question 6

Which glial cell is primarily responsible for producing myelin in the central nervous system?

Accepted Answer

Oligodendrocyte

Question 7

A patient with multiple sclerosis is experiencing muscle weakness and loss of coordination. Which of the following best explains the underlying cause?

Accepted Answer

Loss of oligodendrocytes leading to demyelination in the central nervous system.

Question 8

Which of the following structures is NOT part of the diencephalon?

Accepted Answer

Cerebellum

Question 9

Which neurotransmitter is primarily involved in the transmission of signals at the neuromuscular junction?

Accepted Answer

Acetylcholine

Question 10

Which of the following best describes the function of the meninges?

Accepted Answer

They protect the brain and spinal cord by providing structural support and acting as a barrier.

Question 11

A patient is unable to form new memories after a traumatic brain injury. Which brain structure is most likely affected?

Accepted Answer

Hippocampus

Question 12

Which of the following is a correct sequence of events for synaptic transmission?

Accepted Answer

Action potential arrival, calcium influx, neurotransmitter release, postsynaptic receptor activation

Question 13

Which equation correctly represents Ohm's Law as applied to neuronal membrane potential?

Accepted Answer

$$V = IR$$

Question 14

Which of the following best describes the role of microglia in the central nervous system?

Accepted Answer

They act as immune cells, removing debris and pathogens.

Question 15

A patient is diagnosed with encephalitis. Which of the following best describes this condition?

Accepted Answer

Inflammation of the brain tissue.

Question 16

Which of the following is a function of the hypothalamus?

Accepted Answer

Control of homeostasis, including temperature and hunger.

Question 17

Which of the following best explains the difference between afferent and efferent neurons?

Accepted Answer

Afferent neurons carry sensory information to the CNS, while efferent neurons carry motor commands from the CNS.

Question 18

Which of the following is a structural feature unique to neurons that allows for rapid transmission of electrical signals?

Accepted Answer

Myelinated axons with nodes of Ranvier

Question 19

A patient is unable to regulate heart rate and breathing after a stroke. Which brain region is most likely affected?

Accepted Answer

Medulla oblongata

Question 20

Which of the following best describes the function of the corpus callosum?

Accepted Answer

It connects the two hemispheres of the brain, allowing communication between them.

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