a& p chapter 10
Chapter 10-12: Nervous System & Special Senses
1. Masses of myelinated nerve fibers appear
a. white.
b. gray.
c. brown.
d. transparent.
Answer: A
2. Which of the following lists the parts of a reflex arc in the correct sequence?
a. receptor, sensory neuron, motor neuron, interneuron, effector
b. effector, receptor, sensory neuron, motor neuron, interneuron
c. effector, sensory neuron, receptor, interneuron, motor neuron
d. receptor, sensory neuron, interneuron, motor neuron, effector
Answer: D
3. When a nerve fiber is polarized, the concentration of
a. sodium and potassium ions is higher on the inside of its membrane.
b. sodium and potassium ions is higher on the outside of its membrane.
c. sodium ions is higher on the inside of its membrane and potassium ions is higher on the outside.
d. sodium ions is higher on the outside of its membrane and potassium ions is higher on the inside.
Answer: D
4. Saltatory conduction
a. occurs only if the myelin sheath is continuous.
b. occurs only if nodes of Ranvier are lacking.
c. is faster than conduction on an unmyelinated fiber.
d. is slower than conduction on an unmyelinated fiber.
Answer: C
5. The most rapid nerve impulses are conducted on fibers that are
a. thick and myelinated.
b. thick and unmyelinated.
c. thin and myelinated.
d. thin and unmyelinated.
Answer: A
6. The nervous system
a. detects changes in the internal or external environment.
b. controls the movement of muscles and secretions of glands.
c. integrates information from several sources and uses it to make an appropriate response.
d. all of the above
Answer: D
7. Which of the following neurotransmitters functions to relieve pain sensations?
a. beta-endorphin
b. acetylcholine
c. epinephrine
d. dopamine
Answer: A
8. What is the correct sequence of these events that follow a threshold potential?
1. The membrane becomes depolarized.
2. Sodium channels open and sodium ions diffuse inward.
1. Masses of myelinated nerve fibers appear
a. white.
b. gray.
c. brown.
d. transparent.
Answer: A
2. Which of the following lists the parts of a reflex arc in the correct sequence?
a. receptor, sensory neuron, motor neuron, interneuron, effector
b. effector, receptor, sensory neuron, motor neuron, interneuron
c. effector, sensory neuron, receptor, interneuron, motor neuron
d. receptor, sensory neuron, interneuron, motor neuron, effector
Answer: D
3. When a nerve fiber is polarized, the concentration of
a. sodium and potassium ions is higher on the inside of its membrane.
b. sodium and potassium ions is higher on the outside of its membrane.
c. sodium ions is higher on the inside of its membrane and potassium ions is higher on the outside.
d. sodium ions is higher on the outside of its membrane and potassium ions is higher on the inside.
Answer: D
4. Saltatory conduction
a. occurs only if the myelin sheath is continuous.
b. occurs only if nodes of Ranvier are lacking.
c. is faster than conduction on an unmyelinated fiber.
d. is slower than conduction on an unmyelinated fiber.
Answer: C
5. The most rapid nerve impulses are conducted on fibers that are
a. thick and myelinated.
b. thick and unmyelinated.
c. thin and myelinated.
d. thin and unmyelinated.
Answer: A
6. The nervous system
a. detects changes in the internal or external environment.
b. controls the movement of muscles and secretions of glands.
c. integrates information from several sources and uses it to make an appropriate response.
d. all of the above
Answer: D
7. Which of the following neurotransmitters functions to relieve pain sensations?
a. beta-endorphin
b. acetylcholine
c. epinephrine
d. dopamine
Answer: A
8. What is the correct sequence of these events that follow a threshold potential?
1. The membrane becomes depolarized.
2. Sodium channels open and sodium ions diffuse inward.