PRACTICE QUESTIONS

I. Which of the following is not always a component of a reflex arc?

a. Receptor

b. Sensory neuron (CNS afferent)

c. Central nervous system (CNS) interneuron

d. Motor neuron (CNS efferent)

e.

2. Which of the following regarding sensory receptors is false?

a. Fhey transduce environmental signals, directly or indirectly, into neuronal action potentials.

b. A primary receptor can be a specialized peripheral region of a sensory neuron.

c. They directly transduce CNS action potentials into physical activity of a target organ.

d. I hey are the initial component of a reflex arc.

3. When the intensity with which a receptor is stimulated is increased, what happens to the frequency of action potentials along the sensory neuron from that receptor?

a. Increases

b. Decreases

c. No change

4. Which of the following is not an example of a segmental reflex?

a. Quadriceps stretch reflex

b. Pupillary light reflex

c. Vestibulospinal postural reflexes

5. An intersegmental reflex arc is one in which:

a. The course of the arc is restricted to one or a small number of segments of the CNS.

b. No target organ is present.

c. No receptor is present.

d. The course of the arc traverses several segments of the CNS.

e. Both b and c.