Q: Which equation correctly represents the Nernst equation for calculating the equilibrium potential for potassium ($$K^+) $$ions?

$$E_K = \frac{RT}{zF} \ln \left( \frac{[K^+]_{\text{out}}}{[K^+]_{\text{in}}} \right)$$

Question 1

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

Accepted Answer

The CNS consists of the brain and spinal cord, while the PNS includes all neural tissue outside the CNS.

Question 2

Which neuroglial cell is responsible for forming the myelin sheath in the central nervous system, and what is its functional significance?

Accepted Answer

Oligodendrocytes; they increase the speed of action potential conduction via saltatory conduction.

Question 3

A patient presents with loss of fine touch and proprioception on the right side of the body. Which ascending pathway is most likely damaged?

Accepted Answer

The posterior columns pathway (dorsal columns)

Question 4

Which of the following best explains why action potentials only travel in one direction along an axon?

Accepted Answer

The refractory period prevents the reopening of voltage-gated sodium channels immediately behind the action potential.

Question 5

Which equation correctly represents the Nernst equation for calculating the equilibrium potential for potassium ($$K^+) $$ions?

Accepted Answer

$$E_K = \frac{RT}{zF} \ln \left( \frac{[K^+]_{	ext{out}}}{[K^+]_{	ext{in}}} ight)$$

Question 6

A person accidentally touches a hot stove and quickly withdraws their hand. Which reflex arc is primarily responsible for this response, and what is the main sensory receptor involved?

Accepted Answer

Flexion (withdrawal) reflex; nociceptors

Question 7

Which neurotransmitter is released at the neuromuscular junction, and what is its effect on the postsynaptic membrane?

Accepted Answer

Acetylcholine; it generates an excitatory postsynaptic potential (EPSP)

Question 8

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

Accepted Answer

It acts as a relay station for sensory information traveling to the cerebral cortex.

Question 9

Which cranial nerve is responsible for carrying auditory information from the cochlea to the brain, and where is the primary auditory cortex located?

Accepted Answer

Cranial nerve VIII (vestibulocochlear); temporal lobe

Question 10

Which of the following best explains why half of the optic nerve fibers cross at the optic chiasm?

Accepted Answer

To allow visual information from each eye to be processed by both hemispheres of the brain.

Question 11

Which of the following is a correct description of saltatory conduction?

Accepted Answer

Action potentials jump from one node of Ranvier to the next along myelinated axons.

Question 12

Which neurotransmitter is released by sympathetic post-ganglionic neurons, and which type of receptor does it primarily activate?

Accepted Answer

Norepinephrine; adrenergic receptors

Question 13

A patient is given Botox injections to treat muscle spasms. Which of the following best describes the mechanism of action of Botox?

Accepted Answer

It inhibits the release of acetylcholine at the neuromuscular junction, preventing muscle contraction.

Question 14

Which of the following best describes the difference between an EPSP and an IPSP?

Accepted Answer

An EPSP depolarizes the postsynaptic membrane, while an IPSP hyperpolarizes it.

Question 15

Which of the following is a function of the cerebellum?

Accepted Answer

Coordinating voluntary movements and reducing motor error

Question 16

Which of the following best describes the organization of gray and white matter in the spinal cord?

Accepted Answer

Gray matter is located centrally in an H-shaped region, surrounded by white matter.

Question 17

Which of the following best explains why referred pain occurs?

Accepted Answer

Sensory neurons from different regions converge on the same spinal cord neurons, causing the brain to misinterpret the source.

Question 18

Which of the following is a correct sequence for the flow of cerebrospinal fluid (CSF) through the central nervous system?

Accepted Answer

Lateral ventricles → third ventricle → cerebral aqueduct → fourth ventricle → subarachnoid space

Question 19

Which of the following best describes the effect of the sympathetic nervous system on the heart?

Accepted Answer

It increases heart rate and force of contraction.

Question 20

Which of the following is a function of the limbic system?

Accepted Answer

Regulation of emotion and memory formation

Comprehensive Study Guidance for ANP Nervous System and Special Senses

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