Question 1

Reflex arcs for stretch reflexes are polysynaptic, while those for withdrawal reflexes are monosynaptic.

Accepted Answer

A) True 
 B)False  False

Question 2

Which of the following is NOT true of the Babinski reflex?

Accepted Answer

A)  It is a normal response in infants. 
B)  It is an abnormal response that occurs in some adults in the calcaneal reflex. 
C)  It involves dorsiflexion of the great toe and spreading of the toes. 
D)  In an adult, it may indicate damage to the corticospinal tracts of the central nervous system. 
E)  All of these are true of the Babinski reflex. 
A)  It is a normal response in infants. 
B)  It is an abnormal response that occurs in some adults in the calcaneal reflex. 
C)  It involves dorsiflexion of the great toe and spreading of the toes. 
D)  In an adult, it may indicate damage to the corticospinal tracts of the central nervous system. 
E)  All of these are true of the Babinski reflex. B

Question 3

Which of the following nerves innervates the effectors of the patellar reflex?

Accepted Answer

A)  Musculocutaneous nerve 
B)  Median nerve 
C)  Common fibular nerve 
D)  Femoral nerve 
E)  Tibial nerve 
A)  Musculocutaneous nerve 
B)  Median nerve 
C)  Common fibular nerve 
D)  Femoral nerve 
E)  Tibial nerve D

Question 4

The stretch reflex tests that you demonstrated in this lab require input from the brain in order to work properly.

Accepted Answer

A) True 
 B)False

Question 5

The stretch receptors of the biceps reflex are located in the biceps brachii muscle and tendon.

Accepted Answer

A) True 
 B)False

Question 6

When testing the biceps reflex, what is the proper area to tap with the reflex hammer?

Accepted Answer

A)  In the middle of the biceps brachii muscle 
B)  On one of the biceps tendons in the shoulder area 
C)  On the tendon of the triceps brachii muscle in the elbow 
D)  Anywhere on the biceps brachii muscle 
E)  The biceps brachii tendon in the bend of the elbow 
A)  In the middle of the biceps brachii muscle 
B)  On one of the biceps tendons in the shoulder area 
C)  On the tendon of the triceps brachii muscle in the elbow 
D)  Anywhere on the biceps brachii muscle 
E)  The biceps brachii tendon in the bend of the elbow

Question 7

Stretch reflexes and withdrawal reflexes are types of autonomic reflexes.

Accepted Answer

A) True 
 B)False

Question 8

The anterior roots of spinal nerves house axons of

Accepted Answer

A)  motor neurons. 
B)  association neurons. 
C)  interneurons. 
D)  afferent neurons. 
E)  sensory neurons. 
A)  motor neurons. 
B)  association neurons. 
C)  interneurons. 
D)  afferent neurons. 
E)  sensory neurons.

Question 9

Which of the following is NOT true of stretch and withdrawal reflexes?

Accepted Answer

A)  They are voluntary. 
B)  They occur rapidly. 
C)  They are automatic responses. 
D)  They are subconscious responses. 
E)  All of these are true of stretch and withdrawal reflexes. 
A)  They are voluntary. 
B)  They occur rapidly. 
C)  They are automatic responses. 
D)  They are subconscious responses. 
E)  All of these are true of stretch and withdrawal reflexes.

Question 10

What is the role of an inhibitory interneuron in a stretch reflex?

Accepted Answer

A)  It is used to inhibit the antagonistic muscles from contracting at the same time as the effectors of the reflex. 
B)  It is used to ensure that the effectors do not contract excessively. 
C)  It sends inhibitory commands to the opposite limb, so it will not respond. 
D)  It ensures that the reflex does not damage the effectors. 
E)  Inhibitory interneurons are not involved in stretch reflexes. 
A)  It is used to inhibit the antagonistic muscles from contracting at the same time as the effectors of the reflex. 
B)  It is used to ensure that the effectors do not contract excessively. 
C)  It sends inhibitory commands to the opposite limb, so it will not respond. 
D)  It ensures that the reflex does not damage the effectors. 
E)  Inhibitory interneurons are not involved in stretch reflexes.

Question 11

Which portion of a reflex arc is the only portion that is found entirely within the CNS?

Accepted Answer

A)  The motor neuron 
B)  The integration center 
C)  The receptor 
D)  The effector 
E)  The sensory neuron 
A)  The motor neuron 
B)  The integration center 
C)  The receptor 
D)  The effector 
E)  The sensory neuron

Question 12

Which of the following is NOT true of the crossed extensor reflex?

Accepted Answer

A)  It occurs in conjunction with a withdrawal reflex. 
B)  When flexor muscles of the lower limb contract due to stepping on a sharp object, the extensor muscles in the same limb are inhibited. 
C)  It occurs in reflexes in both the upper and lower limb. 
D)  When flexor muscles of the lower limb contract due to stepping on a sharp object, the extensor muscles in the opposite limb are stimulated. 
E)  The crossed extensor reflex helps a person remain upright during the withdrawal reflex. 
A)  It occurs in conjunction with a withdrawal reflex. 
B)  When flexor muscles of the lower limb contract due to stepping on a sharp object, the extensor muscles in the same limb are inhibited. 
C)  It occurs in reflexes in both the upper and lower limb. 
D)  When flexor muscles of the lower limb contract due to stepping on a sharp object, the extensor muscles in the opposite limb are stimulated. 
E)  The crossed extensor reflex helps a person remain upright during the withdrawal reflex.

Question 13

The normal response(s) in the plantar reflex is/are

Accepted Answer

A)  plantar flexion of the foot only. 
B)  dorsiflexion of the foot and spreading of the toes. 
C)  flexion of the toes only. 
D)  dorsiflexion of the foot only. 
E)  plantar flexion of the foot and flexion of the toes. 
A)  plantar flexion of the foot only. 
B)  dorsiflexion of the foot and spreading of the toes. 
C)  flexion of the toes only. 
D)  dorsiflexion of the foot only. 
E)  plantar flexion of the foot and flexion of the toes.

Question 14

A reflex arc is the simplest kind of neural pathway in the nervous system.

Accepted Answer

A) True 
 B)False

Question 15

Which of the following represents the correct order of components in a reflex arc?

Accepted Answer

A)  Effector, sensory neuron, integration center, motor neuron, receptor 
B)  Receptor, sensory neuron, integration center, motor neuron, effector 
C)  Sensory neuron, receptor, integration center, motor neuron, effector 
D)  Receptor, motor neuron, integration center, sensory receptor, effector 
E)  Integration center, receptor, sensory neuron, effector, motor neuron 
A)  Effector, sensory neuron, integration center, motor neuron, receptor 
B)  Receptor, sensory neuron, integration center, motor neuron, effector 
C)  Sensory neuron, receptor, integration center, motor neuron, effector 
D)  Receptor, motor neuron, integration center, sensory receptor, effector 
E)  Integration center, receptor, sensory neuron, effector, motor neuron

Question 16

Reflexes involving skeletal muscles are called ________ reflexes.

Accepted Answer

A)  autonomic 
B)  spinal 
C)  somatic 
D)  skeletal 
E)  subconscious 
A)  autonomic 
B)  spinal 
C)  somatic 
D)  skeletal 
E)  subconscious

Exam 29: Reflex Arc and Somatic Reflexes

Reflex arcs for stretch reflexes are polysynaptic, while those for withdrawal reflexes are monosynaptic.

Which of the following is NOT true of the Babinski reflex?

Which of the following nerves innervates the effectors of the patellar reflex?

The stretch reflex tests that you demonstrated in this lab require input from the brain in order to work properly.

The stretch receptors of the biceps reflex are located in the biceps brachii muscle and tendon.

When testing the biceps reflex, what is the proper area to tap with the reflex hammer?

Stretch reflexes and withdrawal reflexes are types of autonomic reflexes.

The anterior roots of spinal nerves house axons of

Which of the following is NOT true of stretch and withdrawal reflexes?

What is the role of an inhibitory interneuron in a stretch reflex?

Which portion of a reflex arc is the only portion that is found entirely within the CNS?

Which of the following is NOT true of the crossed extensor reflex?

The normal response(s) in the plantar reflex is/are

A reflex arc is the simplest kind of neural pathway in the nervous system.

Which of the following represents the correct order of components in a reflex arc?

Reflexes involving skeletal muscles are called ________ reflexes.

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