Q: Which equation correctly represents the Nernst equation for calculating the equilibrium potential of an ion across a membrane?

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

Question 1

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

Accepted Answer

The CNS is composed of the brain and spinal cord, while the PNS consists of nerves and ganglia outside the CNS.

Question 2

Which neurotransmitter is primarily involved in the transmission of nerve impulses at neuromuscular junctions, and what is its main effect?

Accepted Answer

Acetylcholine; stimulates muscle contraction

Question 3

A patient presents with muscle weakness and spastic paralysis. Which region of the spinal cord is most likely affected?

Accepted Answer

Ventral horn of the spinal cord

Question 4

Which of the following best explains the difference between electrical and chemical synapses?

Accepted Answer

Electrical synapses allow direct passage of ions through gap junctions, while chemical synapses use neurotransmitter release across a synaptic cleft.

Question 5

Which equation correctly represents the Nernst equation for calculating the equilibrium potential of an ion across a membrane?

Accepted Answer

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

Question 6

During an action potential, which event occurs immediately after the membrane potential reaches threshold?

Accepted Answer

Voltage-gated sodium channels open, causing rapid depolarization.

Question 7

A patient is diagnosed with multiple sclerosis, a disease characterized by demyelination. Which of the following best describes the effect of demyelination on nerve impulse conduction?

Accepted Answer

It slows down or blocks the propagation of action potentials along axons.

Question 8

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

Accepted Answer

Promotes digestion and decreases heart rate

Question 9

Which structure in the brain is primarily responsible for regulating homeostatic functions such as body temperature, hunger, and thirst?

Accepted Answer

Hypothalamus

Question 10

A patient with spinal bifida exhibits incomplete closure of the neural tube during development. Which of the following best describes a possible consequence of this condition?

Accepted Answer

Defective spinal cord development and possible paralysis below the affected region

Question 11

Which of the following best describes the role of the blood-brain barrier?

Accepted Answer

It selectively restricts the passage of certain substances from the blood into the brain, protecting neural tissue.

Question 12

Which of the following is a distinguishing feature of the sympathetic division compared to the parasympathetic division of the autonomic nervous system?

Accepted Answer

Sympathetic division prepares the body for 'fight or flight' responses, while parasympathetic division promotes 'rest and digest' activities.

Question 13

Which of the following best explains the relationship between orthostatic hypotension and the autonomic nervous system?

Accepted Answer

Orthostatic hypotension occurs when the autonomic nervous system fails to adequately constrict blood vessels upon standing, leading to a drop in blood pressure.

Question 14

Which of the following best describes the function of the dorsal root of the spinal cord?

Accepted Answer

It carries sensory information from the periphery to the CNS.

Question 15

Which of the following is a correct sequence of events in the generation of a nerve impulse?

Accepted Answer

Resting potential → Depolarization → Action potential → Repolarization

Question 16

Which of the following best describes the function of cranial nerves?

Accepted Answer

They transmit sensory and motor information to and from the head and neck.

Question 17

A patient is unable to distinguish between sweet and salty tastes. Which special sensory receptor is most likely affected?

Accepted Answer

Gustatory receptor

Question 18

Which of the following best describes the effect of the homeostatic imbalance multiple sclerosis on the nervous system?

Accepted Answer

Destruction of the myelin sheath leads to impaired nerve impulse conduction.

Question 19

Which of the following is a function of the thalamus in the brain?

Accepted Answer

Acts as a relay station for sensory information to the cerebral cortex

Nervous System and Special Senses: Exam 3 Study Guide

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