Question 1

Which of the following best describes the difference between the afferent and efferent divisions of the peripheral nervous system?

Accepted Answer

Afferent division detects sensory stimuli and sends information to the CNS, while efferent division sends motor commands from the CNS to effectors.

Question 2

A patient is unable to feel pain in their left arm after a spinal cord injury. Which type of sensory receptor is most likely affected?

Accepted Answer

Nociceptors

Question 3

Which of the following is TRUE regarding the coding of stimulus strength at a sensory receptor?

Accepted Answer

Stimulus strength is coded by the frequency of action potentials generated.

Question 4

Which of the following best explains why referred pain occurs, such as left arm pain during a heart attack?

Accepted Answer

Pain signals from the heart and arm travel along the same neural pathways to the brain, causing the brain to misinterpret the source.

Question 5

Which neurotransmitter is primarily responsible for transmitting pain signals in the ascending pathways to the brain?

Accepted Answer

Substance P

Question 6

A person is exposed to botulinum toxin, which blocks the release of acetylcholine (ACh) at the neuromuscular junction. What is the most likely physiological effect?

Accepted Answer

Muscle paralysis due to inability to stimulate muscle contraction.

Question 7

Which of the following is a characteristic of phasic receptors?

Accepted Answer

They send signals primarily at the beginning or end of a stimulus and adapt quickly.

Question 8

Which of the following best describes the sequence of events at the neuromuscular junction leading to muscle contraction?

Accepted Answer

ACh is released from the motor neuron, binds to receptors on the muscle cell, leading to Na$$^+$$ influx and depolarization.

Question 9

Which type of sensory receptor is responsible for detecting changes in muscle length and helping you know the position of your limbs in space?

Accepted Answer

Proprioceptors

Question 10

A patient with myasthenia gravis experiences muscle weakness because:

Accepted Answer

Their immune system inactivates acetylcholine receptors at the neuromuscular junction.

Question 11

Which of the following is an example of a tonic receptor?

Accepted Answer

Nociceptor

Question 12

Which of the following best describes the function of mechanoreceptors?

Accepted Answer

They detect physical deformation such as pressure, touch, and vibration.

Question 13

Which of the following is TRUE regarding the somatic nervous system?

Accepted Answer

It controls voluntary movements of skeletal muscles.

Question 14

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

Accepted Answer

It includes the sympathetic and parasympathetic divisions.

Question 15

A person steps on a sharp object and immediately withdraws their foot. Which neural pathway is primarily responsible for this reflex action?

Accepted Answer

Simple reflex arc involving sensory neuron, interneuron, and motor neuron in the spinal cord

Question 16

Which of the following best explains why pain is considered a protective mechanism?

Accepted Answer

It brings conscious awareness to tissue damage, motivating protective action.

Question 17

Which of the following is a function of substance P in the nervous system?

Accepted Answer

It allows ascending pain information to be directed to the thalamus and cortex.

Question 18

Which of the following scenarios best illustrates the concept of adaptation in sensory receptors?

Accepted Answer

A person stops noticing the smell of perfume after a few minutes.

Question 19

Which of the following toxins would most likely cause continuous muscle contraction by preventing the breakdown of acetylcholine at the neuromuscular junction?

Accepted Answer

Organophosphates

Question 20

Which of the following best describes the role of glutamate in pain perception?

Accepted Answer

It magnifies feelings associated with pain, making even light touch painful in some cases.

Chapter 13: The Peripheral Nervous System – Sensory Receptors, Reflexes, and the Neuromuscular Junction

Study Guide - Practice Questions

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