Question 1

Which of the following best describes the main difference between the somatic and autonomic nervous systems?

Accepted Answer

The somatic nervous system controls voluntary movements, while the autonomic nervous system regulates involuntary functions.

Question 2

During an action potential, which of the following best describes the movement of ions across the neuronal membrane?

Accepted Answer

Na$$^+$$ rushes into the cell during depolarization, and K$$^+$$ rushes out during repolarization.

Question 3

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

Accepted Answer

The absolute refractory period prevents the backward propagation of the action potential.

Question 4

A patient is exposed to a toxin that destroys oligodendrocytes. Which process would be most directly affected?

Accepted Answer

Formation of myelin sheaths in the central nervous system

Question 5

Which of the following best describes the role of Ca$$^{2+} at a $$chemical synapse?

Accepted Answer

Ca$$^{2+}$$ enters the synaptic end bulb and triggers the release of neurotransmitters from synaptic vesicles.

Question 6

Which of the following is a function of the reticular activating system in the brainstem?

Accepted Answer

Regulation of consciousness and alertness

Question 7

A person touches a hot stove and immediately withdraws their hand. Which neural pathway is primarily responsible for this rapid response?

Accepted Answer

A simple reflex arc involving the spinal cord

Question 8

Which of the following best describes saltatory conduction?

Accepted Answer

The action potential jumps from one node of Ranvier to the next, increasing conduction speed.

Question 9

Which neurotransmitter is released at the neuromuscular junction to stimulate skeletal muscle contraction?

Accepted Answer

Acetylcholine

Question 10

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 11

Which of the following is a function of the hypothalamus?

Accepted Answer

Regulation of body temperature and homeostasis

Question 12

A patient has damage to the hippocampus. Which function is most likely to be impaired?

Accepted Answer

Formation of new long-term memories

Question 13

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

Accepted Answer

Coordination of voluntary movements and balance

Question 14

Which of the following statements about sensory adaptation is correct?

Accepted Answer

It is a decrease in response to a constant stimulus over time.

Question 15

Which of the following best explains why sniffing improves the perception of smell?

Accepted Answer

Sniffing increases the flow of air over the olfactory receptors, enhancing odor detection.

Question 16

Which of the following best describes the process of accommodation in the eye?

Accepted Answer

The lens changes shape to focus light on the retina for near or distant vision.

Question 17

Which of the following is true regarding the detection of color by the human eye?

Accepted Answer

Color is detected by three types of cone cells, each sensitive to different wavelengths of light.

Question 18

Which of the following best describes how the ear distinguishes between high and low frequency sounds?

Accepted Answer

Different regions of the basilar membrane in the cochlea vibrate in response to different frequencies.

Question 19

A patient is unable to maintain balance when standing still, but has no hearing loss. Which structure is most likely affected?

Accepted Answer

Vestibular apparatus (utricle, saccule, semicircular canals)

Question 20

Which of the following best describes the function of the basal ganglia?

Accepted Answer

Regulation of voluntary motor control and procedural learning

Comprehensive Study Guidance for Bio 111: Nervous System, Eye, and Ear

Study Guide - Practice Questions