Question 1

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

Accepted Answer

To control and communicate information throughout the body using electrical and chemical signals

Question 2

A patient presents with muscle weakness and loss of coordination. MRI reveals demyelination in the CNS. Which glial cell type is most likely affected?

Accepted Answer

Oligodendrocytes

Question 3

Which equation correctly represents the Nernst potential for potassium ($$K^+) $$across a neuronal membrane?

Accepted Answer

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

Question 4

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

Accepted Answer

Voltage-gated sodium channels become inactivated during the refractory period, preventing backward propagation

Question 5

A patient is unable to feel pain or temperature in their left hand. Which type of sensory receptor is most likely damaged?

Accepted Answer

Nociceptors

Question 6

Which of the following statements about graded potentials is correct?

Accepted Answer

Graded potentials can summate to reach threshold and trigger an action potential

Question 7

Which structure in the eye is responsible for regulating the amount of light entering the pupil?

Accepted Answer

Iris

Question 8

During the transmission of a nerve impulse, which sequence correctly describes the path of impulse from the photoreceptor to the brain?

Accepted Answer

Photoreceptor → Bipolar neuron → Ganglion neuron → Optic nerve → Optic chiasm → Optic tract → Brain

Question 9

Which of the following best describes saltatory conduction?

Accepted Answer

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

Question 10

Which neurotransmitter is most commonly associated with neuromuscular junctions?

Accepted Answer

Acetylcholine

Question 11

A patient with multiple sclerosis experiences slowed nerve conduction. Which of the following best explains this phenomenon?

Accepted Answer

Loss of myelin sheaths produced by oligodendrocytes in the central nervous system

Question 12

Which of the following equations represents Ohm's Law as applied to the movement of ions across a neuronal membrane?

Accepted Answer

$$I = V \div R$$

Question 13

Which part of the brain is primarily responsible for regulating heart rate, blood pressure, and breathing?

Accepted Answer

Medulla oblongata

Question 14

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

Accepted Answer

They support and brace neurons, regulate neurotransmitter levels, and participate in information processing

Question 15

Which of the following is TRUE regarding the absolute refractory period of an action potential?

Accepted Answer

Most voltage-gated sodium channels are inactivated, so no new action potential can be generated

Question 16

Which of the following best explains the difference between graded potentials and action potentials?

Accepted Answer

Graded potentials decrease in strength as they spread, while action potentials maintain their strength over distance

Question 17

Which of the following is a function of the thalamus?

Accepted Answer

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

Question 18

Which of the following best describes the function of the sodium-potassium pump ($$Na^+/K^+$$ ATPase) in neurons?

Accepted Answer

It maintains the resting membrane potential by pumping $$3$$ $$Na^+$$ out and $$2$$ $$K^+ in$$

Question 19

A patient is unable to distinguish between red and green colors. Which structure or function is most likely affected?

Accepted Answer

Cones in the retina

Question 20

Which of the following best describes the process of phototransduction in the retina?

Accepted Answer

Conversion of light energy into a graded receptor potential in photoreceptors

Comprehensive Study Notes: The Nervous System and Special Senses

Study Guide - Practice Questions

Study Guide - Flashcards