PNS Make Your Own Questions

Which term describes a programmed, automatic response to a stimulus?

Reflex

Which type of sensory receptor detects light?

Photoreceptors

The patellar (knee-jerk) reflex tests which nerve from the lumbar plexus?

Femoral nerve

What type of reflex is the patellar (knee-jerk) reflex?

Somatic Reflex

Which nerve from the cervical plexus provides motor innervation to the diaphragm?

Phrenic nerve

What reflex is triggered when a visceral sensory nerve ending of glossopharyngeal nerve in the posterior of the throat is stimulated?

Gag reflex

What sacral plexus nerve is the motor to the gluteus maximus muscle?

Inferior Gluteal Nerve

What is the main function of a first-order sensory neuron?

To carry sensory information toward the central nervous system

What is a sensory receptive field?

The area of the body monitored by a particular sensory neuron

What is referred pain?

Pain felt in an area different from where the problem originates

Which type of receptor detects changes in temperature?

Thermoreceptors

What is the main difference between rapidly adapting and slowly adapting sensory receptors?

Rapidly adapting receptors stop sending signals after a period of time.

What type of mechanoreceptors is the primarily responsible for transmitting rapid changes and discriminative touch stimuli?

Tactile corpuscles (Meissner corpuscles)

Which feature best describes the location of the phrenic nerve?

C3-C5

Which type of sensory receptor detects change in temperature?

Thermoreceptors

What is the function of the body regions that have many neurons with smaller receptive fields?

sensing the environment

What is the main difference between the dorsal root and the ventral root of a spinal nerve?

The dorsal root carries sensory signals, while the ventral root carries motor signals.

How do cranial nerve reflexes help the body respond to a stimulus?

They allow the body to respond automatically through sensory and motor pathways

Which of the following describes the origination and function of the posterior root?

sensory neurons from posterior horn

What best describes the role of the thoracic plexus in relation to the reflex arc?

It helps carry nerve signals between the spinal cord and areas of the back and trunk

Which statement best explains the purpose of a reflex arc?

It produces a rapid, automatic response to a stimulus.

How do sensory receptors in the special senses help the body respond to different stimuli?

They detect specific stimuli such as light, sound, head movements, and chemicals

Which statement best explains what happens during sensory transduction?

Sensory receptors convert a stimulus, such as light, sound, or pressure into an electrical signal that the nervous system can process.

Which Statement best explains how the brachial plexus contributes to motor output in the upper limb?

It organizes nerve fibers from spinal nerves C5-T1 into peripheral nerves that carry motor signals to upper limb muscles

A person touches something extremely hot, and the temperature is outside the normal range of warm receptors. What is most likely to happen?

Nociceptors are stimulated, causing pain.

A patient accidentally touches a hot pan and quickly pulls their hand away before consciously realizing that the pan is hot. Which PNS pathway is primarily responsible for producing this rapid response?

A reflex arc involving sensory and motor neurons through the spinal cord

A patient has damage to a motor neuron that controls skeletal muscle movement. Which type of signal is being affected?

Motor- efferent output

A patient is having a heart attack but feels pain in their left arm instead of only in their chest. Which concept best explains why the patient feels pain in a different area of the body?

Referred pain

A girl touches a hot stove, causing a sensory receptor to detect the stimulus. What would happen next during sensory transduction?

Sodium ions enter the axoplasm and cause depolarization

A patient has damage to her lower motor neuron that usually connects directly with skeletal muscle fibers. What effect best explains the outcome?

ACH cannot be released on skeletal muscle fiber to initiate contraction.

A person touches a hot surface and quickly pulls their hand away. Which reflex is being demonstrated?

Flexion reflex

A student is learning about the three tunics (layers) of the eye. Which statement correctly explains the function of the vascular tunic?

It contains blood vessels that help nourish the retina and melanocytes that absorb extra light

You accidentally touch a hot stove and instantly pull your hand away before you even realize how hot it is. When applying your understanding of the reflex arc, which of the following explains why your hand moves before your brain consciously feels the pain?

The nerve signal from the hand reaches the spinal cord and triggers an immediate motor response via interneurons before the slower signal reaches the conscious parts of the brain.

A researcher selectively inhabits activity in small lower motor neurons within a motor neuron pool. What would be the most accurate prediction for the outcome of this?

Impaired stretch-receptor feedback because intrafusal fibers cannot be properly stimulated

A patient experiencing a heart attack reports pain in the left shoulder and arm rather than directly over the heart. Which explanation best describes this phenomenon?

Sensory signals from the heart and shoulder converge onto similar pathways in the central nervous system.

Which of the following comparisons effectively highlights the differences between Meissner (tactile) corpuscles and Pacinian (lamellated) corpuscles?

Meissner corpuscles are involved in detecting discriminative touch and are rapidly adapting, and Pacinian corpuscles are detecting vibrations and deep pressure, and are rapidly adapting

A student analyzes Merkel cell fibers in comparison with Ruffini (bulbous) corpuscles. Which of the following statements is an accurate analysis of their common and different functions?

They are both rapidly adapting receptors that detect vibration

A prolonged stimulation leads to one receptor being able to produce action potentials constantly, while for the other receptor its activity is declining over time. What is an accurate analysis of such case?

First receptor is slowly adapting, and second one is rapidly adapting

Which of the following comparisons correctly differentiates mechanoreceptors from thermoreceptors?

Mechanoreceptors react to mechanical energy, while thermoreceptors react to temperature changes

Which comparison best explains how the sacral plexus differs from the brachial plexus?

The sacral plexus supplies nerves to the lower limbs, while the brachial plexus supplies nerves to the upper limbs

Which best distinguishes the upper trunk from the lower trunk of the brachial plexus?

The upper trunk is formed by C5–C6, while the lower trunk is formed by C8–T1

During assessment, a patient’s patellar tendon is tapped and the lower leg extends. Based on the information provided, this response is best described as a:

Simple stretch reflex

Which best describes the difference between rapidly adapting receptors and slowly adapting receptors?

Rapidly adapting receptors diminish after a certain time period, while slowly adapting receptors do not diminish over time

What differentiates spinal nerves from some cranial nerves?

All 31 pairs of spinal nerves ARE mixed nerves.

if the anterior and posterior rami fail, what would the direct effect?

Somatic and Sensory signals will not be sent or received

A student claims that mechanoreceptors are only responsible for detecting pain. Which option supports or goes against the student's claim?

Mechanoreceptors detect touch, pressure, vibration, and stretch

A student argues that the thermoreceptors are not necessary for maintaining the body's temperature because the skin can dectect touch without them. Which evaluation of this arguement is most accurate?

The argument is incorrect because thermoreceptors detect temperature changes that help the body respond to heat and cold

A patient injures the upper left part of their brachial plexus, affecting the C5 and C6 nerve roots. which movement would most likely be affected?

Shoulder abduction and elbow flexion

A patient comes in complaining about pain in their left upper arm. If their pain was actually referred pain which organ would the pain most likely originate from?

Heart

A patient holds a vibrating object against their skin. At first, they strongly feel the vibration, but after a few seconds the sensation becomes much less noticeable even though the object is still vibrating. Which type of receptor is most likely responsible, and why?

Rapidly adapting receptor because it responds strongly at first and then reduces signaling during a continuous stimulus

A patient has damaged their spinal cord and can no longer detect sensations from a specific area of the body. Which part of the spinal cord is damaged?

Posterior Root

A patient experiences traumatic damage to the common fibular nerve. Which outcome would most likely occur?

Inability to dorsiflex the foot