Question 1

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

Accepted Answer

To act as the master control and communication system using electrical impulses

Question 2

A patient is unable to consciously control their skeletal muscles but retains normal heart and digestive function. Which division of the nervous system is most likely impaired?

Accepted Answer

Somatic nervous system

Question 3

Which of the following correctly matches the neuron type with its function?

Accepted Answer

Interneurons: Connect sensory and motor neurons within the CNS

Question 4

During the generation of a nerve impulse, which event occurs first?

Accepted Answer

Depolarization due to sodium ion influx

Question 5

A reflex arc typically includes which of the following elements in the correct order?

Accepted Answer

Receptor, sensory neuron, interneuron, motor neuron, effector

Question 6

Which of the following best explains why the blood-brain barrier is important?

Accepted Answer

It protects the brain from harmful substances in the blood while allowing necessary molecules to pass

Question 7

A patient presents with rapid heart rate, dilated pupils, and increased blood pressure after a stressful event. Which division of the autonomic nervous system is primarily responsible for these effects?

Accepted Answer

Sympathetic division

Question 8

Which cranial nerve is primarily responsible for transmitting visual information from the retina to the brain?

Accepted Answer

Optic nerve (II)

Question 9

A person with damage to the cerebellum would most likely experience which of the following symptoms?

Accepted Answer

Impaired coordination and balance

Question 10

Which of the following best describes the function of myelin sheaths around axons?

Accepted Answer

They insulate axons and increase the speed of nerve impulse conduction

Question 11

A patient is diagnosed with hydrocephalus. Which of the following best explains the underlying problem?

Accepted Answer

Blockage of cerebrospinal fluid (CSF) drainage leading to increased pressure

Question 12

Which equation best represents the relationship between the speed of light in a medium and its refractive index, as relevant to the eye's focusing ability?

Accepted Answer

$$n = \frac{c}{v}$$

Question 13

Which of the following is a correct statement about the organization of the nervous system?

Accepted Answer

The peripheral nervous system includes cranial and spinal nerves

Question 14

A person is unable to taste sweet or salty foods but can still detect sour and bitter. Which structure is most likely affected?

Accepted Answer

Taste buds on the anterior two-thirds of the tongue

Question 15

Which of the following best describes the difference between conduction deafness and sensorineural deafness?

Accepted Answer

Conduction deafness is caused by problems transmitting sound vibrations, while sensorineural deafness involves damage to receptor cells or nerves

Question 16

Which of the following is a real-life example of a somatic reflex?

Accepted Answer

Withdrawal of your hand from a hot stove

Question 17

A patient with multiple sclerosis (MS) experiences muscle weakness and loss of coordination. Which of the following best explains the physiological basis for these symptoms?

Accepted Answer

Destruction of the myelin sheath slows or blocks nerve impulse conduction

Question 18

Which of the following best describes the role of the thalamus in the brain?

Accepted Answer

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

Question 19

A person is exposed to a sudden, loud sound and immediately turns their head toward the noise. Which brain region is primarily responsible for this reflexive action?

Accepted Answer

Midbrain

Question 20

Which of the following best explains why damage to the ventral root of a spinal nerve results in paralysis but not loss of sensation?

Accepted Answer

The ventral root contains only motor fibers

The Nervous System: Structure, Function, and Special Senses

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