Chapter 9 part I Review

Mrs. Chirichella

1.In the CNS myelin is formed by a.Schwann cells b.Oligodendrocytes

c.Astrocytes

d.Microglial cells

2. The receptive surface of the neuron is… a.Neurofibrils

b.Nissl fibers c.Axons

d.Dendrites

3. Repolarization occurs b/c… a.K

+ ions diffuse out b.K+ ions diffuse in c.Na

+ ions diffuse out d.Na+ ions diffuse in

4. Unmyelinated fibers appear a.White b.Grey

c.Brown

d.blue

5. An infant’s response to stimuli is “slower” b/c their nerve fibers a.Have not yet appeared b.Cannot carry an impulse c.Have not connected to the brain d.Are not completely myelinated

6. Which of the following is not a neuroglial cell?

a.Astrocyte

b.Oligodendrocyte

c.Ependymal cell d.Nissl cell

7. Which is the order for a reflex arc?

a.receptor, sensory, motor, interneuron, effector b.Effector, receptor, sensory, motor, interneuron c.Receptor, sensory, interneuron, motor, effector

8. Ischemic cell change is caused by a lack of a.Sodium ions b.Potassium ions c.Oxygen

d.Carbon dioxide

9. When a nerve fiber is polarized, the concentration of a.Na

+ & K + ions is higher on the inside b.Na

+ & K + ions is higher outside c.Na

+ K + is higher on the inside & is higher on the outside d.Na

+ is higher outside & K + is higher inside

10. The nucleus of a neuron is located in a.The cell body b.The axon c.The dendrite d.The myelin sheath

11. The part of the neuron that might be myelinated is the: a.Axon

b.Cell body c.nucleus

12. Drugs that decrease the membranes permeability to sodium a.Are used as local anesthetics b.Prevent nerve impulses from passing c.Cause a loss of perception of pain d.All of the above

13. A function of the myelin sheath is to: a.Synthesize neurotransmitters b.Generate ATP for use during an action potential c.Connect several axons together to form a nerve d.Provide electrical insulation to increase the rate of conduction

14. The nodes of Ranvier are: a.Sites of neurotransmitter storage b.Gaps in the myelin sheath c.Sites of myelin production d.Where the nucleus of a neuron is located

15. The CNS contains the brain and the: a.Spinal nerves b.Ganglia

c.Spinal cord d.Motor nerves

16. Afferent (sensory) nerves conduct impulses from: a.The CNS to effectors b.Effectors to the CNS c.Receptors to the CNS d.The CNS to receptors

17. Nerve impulses are conducted toward the cell body by the: a.Axon

b.Dendrite

c.Cell body d.Synaptic knobs

18. During depolarization, which of the following is the primary activity?

a.K

+ are flowing into the cell b.K

+ are flowing out of the cell c.Na

+ are flowing into the cell d.Na

+ are flowing out of the cell

19. The term “saltatory conduction” refers to the: a.“ leaping” of an action potential across a synapse b.Movement of sodium ions into the cell during depolarization c.One-way conduction of a nerve impulse across a synapse d.Conduction of a nerve impulse along a myelinated axon

20. Neurotransmitter is released into the synaptic cleft by a.Exocytosis

b.Osmosis

c.Facilitated diffusion d.Filtration

21. The effect of a neurotransmitter on the postsynaptic cell occurs when the neurotransmitter: a.Diffuses into the postsynaptic cell b.Flows along the postsynaptic cell membrane into transverse tubules c.Is broken down by enzymes in the synaptic cleft d.Binds to specific receptors on the postsynaptic cell membrane See last slide for diagram of synapse.

22. Caffeine and nicotine have excitatory effects because they: a.Reduce the threshold for excitation b.Increase the threshold for excitation c.Opens potassium channels d.Opens calcium channels

1.

2.

5.

3.

6.

7.

4.