A&PII Ch. 13 Complete Study Test.
Select the true statements (more than one) about the characteristics of sensory neurons in the stretch reflex - CORRECT ANSWER When a stretch activates the muscle spindle, these sensory neurons transmit impulses at a higher frequency
These sensory neurons trans...
A&PII Ch. 13 Complete Study Test.
Select the true statements (more than one) about the characteristics of sensory neurons in the stretch
reflex - CORRECT ANSWER When a stretch activates the muscle spindle, these sensory neurons transmit
impulses at a higher frequency
These sensory neurons transmit afferent impulses toward the spinal cord (CNS)
Which is the true statement about the synapses in the spinal cord in the stretch reflex? - CORRECT
ANSWER Interneurons make inhibitory synapses with neurons that prevent contraction of the
antagonist muscle.
Examine the cross section through the lumbar section of the spinal cord and the two patellar reflex
pathways shown. What identifies these synapses? - CORRECT ANSWER Afferent impulses synapse with
motor neurons and interneurons
Pathways will activate one muscle and simultaneously inhibit its antagonist muscle
Examine and characterize the two motor pathways in the stretch patellar reflex - CORRECT ANSWER
Alpha motor neurons send efferent messages to the quadriceps, while parallel efferent messages to the
hamstrings are reduced
A patient sustains a ventral horn injury to the lumbar region of the spine. This injury has damaged the
cell bodies of several afferent nerves within the region. Predict how the patient's patellar reflex might be
affected - CORRECT ANSWER The patient's patellar reflex would be absent or weak
All processing at the circuit level going up to the perceptual level must synapse in the ________. -
CORRECT ANSWER Thalamus
If the ventral root of a spinal nerve were cut, what would be the result in the tissue or region that nerve
supplies? - CORRECT ANSWER a complete loss of voluntary movement
After axonal injury, regeneration in peripheral nerves is guided by ________. - CORRECT ANSWER
Schwann Cells
, Which of the following branches of a spinal nerve contain autonomic motor nerve fibers and is only
found in the thoracic region? - CORRECT ANSWER Rami communicantes
Feeling a gentle caress on your arm would likely involve all of the following except ________ - CORRECT
ANSWER Pacinian corpuscles
Which of the following cranial nerves is purely sensory? - CORRECT ANSWER Optic
Which of the following is a sensory receptor that is stimulated by light touch? - CORRECT ANSWER
Meissner's corpuscles
A fracture of the ethmoid bone could result in damage to which cranial nerve? - CORRECT ANSWER
Olfactory
Which of the following is (are) mixed nerves? - CORRECT ANSWER dorsal ramus
Inborn or intrinsic reflexes are ________. - CORRECT ANSWER involuntary, yet may be modified by
learned behavior
Which nerve is compressed in carpal tunnel syndrome? - CORRECT ANSWER median
What level controls intermediate relay for incoming and outgoing neurons? - CORRECT ANSWER
projection level
Which of the following cranial nerves has its neuron cell body located in a site other than the cranial
sensory ganglia? - CORRECT ANSWER cranial nerve II
Striking the "funny bone" is actually stimulation of (or injury) to. the ________. - CORRECT ANSWER
ulnar nerve
Which of the following receptors is considered a free dendritic ending? - CORRECT ANSWER Merkel's
discs
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