Deck 29: Reflex Arc and Somatic Reflexes

Question 1

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

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.

Answer 1

E

Question 2

Which of the following is NOT 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.

Answer 2

B

Question 3

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

Answer 3

False

Question 4

The anterior roots of spinal nerves house axons of

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

Question 5

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

Question 6

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

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 7

Stretch reflexes and withdrawal reflexes are types of autonomic reflexes.

Question 8

Which of the following is NOT 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 9

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

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

Question 10

Reflexes involving skeletal muscles are called ________ reflexes.

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

Question 11

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

Question 12

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

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 13

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

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

Question 14

Which of the following is NOT true of the crossed extensor 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 15

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

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 16

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