Download Practice Exam 3 ANSWERS

Supplemental Instruction
Exam 3 Practice Test
1. Neuroglia that control the chemical environment around neurons and guide
neuron migration in development are
a. oligodendroctes
b. microglia
c. ependyma
d. astrocytes
2. Which of these ions is actively transported through the plasma membrane to
help establish the resting potential?
a. Ca++
b. K+
c. Na+
d. Fe+
3. An action potential
a. is propagated by the opening of voltage-gated sodium channels
b. occurs whenever a pre-synaptic nerve fires a charge to a post synaptic
nerve
c. is carried out only whenever half of the neural threshold is reached
d. moves bidirectionally away from the cell body
4. Saltatory conduction is made possible by
a. the myelin sheath
b. the somatic and axonal cellular membrane potential
c. oligodendrocytes in the PNS and Schwann cells in the CNS
d. ependymal CSF
5. The presynaptic axon terminal releases vesicles of neurotransmitter via
a. endocytosis
b. exocytosis
c. phagocytosis
d. pinocytosis
6. An excitatory neurotransmitter secreted by motor neurons innervating
skeletal muscle is
a. acetylcholine
b. serotonin
c. dopamine
d. histamine
7. Which of the following structures is least likely to be involved in memory
a. corpus callosum
b. lateral cortex of temporal lobes
c. cerebellum
d. medulla oblongata
8. Preparing the body for the “flight or flight” response is the role of the
a. autonomic nervous system
b. sympathetic nervous system
c. parasympathetic nervous system
d. all of the above
9. Where would you NOT find an autonomic ganglion?
a. the armpit
b. skeletal muscle
c. smooth muscle of blood vessels
d. in the viscera
10. All the preganglionic axons of the sympathetic division of the autonomic
nervous system release
a. the same neurotransmitter as the one released postsynaptic sympathetic
neurons
b. the same neurotransmitter as the one released by parasympathetic
postganglionic axons
c. a different neurotransmitter as the one released by parasympathetic
postganglionic axons
d. none of the above
11. Which is NOT detected by a mechanoreceptor type?
a. olfaction
b. touch
c. muscle stretch
d. taste
12. Which skin receptors detect texture and vibrations?
a. Meissner’s corpuscles
b. Pacinian corpuscles
c. Tactile corpuscles
d. a and c
e. all of the above
13. Which represents the oligodendrocyte?
14. The part of the neuron that normally receives stimuli is called the
a. axon terminal
b. soma or cell body
c. dendrite
d. node of Ranvier
15. When an excitatory stimulus affects a resting neuron, the first stimulus-gated
channels open, allowing the membrane to
a. depolarize
b. repolarize
c. hyperpolarize
d. reach equilibrium
16. True or False: In general, neurons with myelinated, large diameter fibers
transmit information more quickly than unmyelinated, small diameter fibers.
17. The point at which an impulse from one nerve cell is communicated to
another nerve cell is the
a. neuronal junction
b. neural gap
c. conduction junction
d. synapse
18. Sympathetic fibers leave the spinal cord in the
a. cervical and sacral regions, and the preganglionic fibers secrete ACh
b. thoracolumbar region, and the postganglionic fibers secrete ACh
c. cervical and sacral regions, and the postganglionic fibers secrete
norepinephrine
d. thoracolumbar region, and the postganglionic fibers secrete
norepinephrine
19. Which skin receptors detect deep pressure
a. Pacinian corpuscles
b. Meissner’s corpuscles
c. Tactile corpuscles
d. Lamellar corpuscles
20. True or false, the parasympathetic NS affects organs not innervated by the
sympathetic NS.
21. Which neuron does NOT release acetylcholine as its neurotransmitter
a. presynaptic parasympathetic neurons
b. postsynaptic parasympathetic neurons
c. presynaptic sympathetic neurons
d. postynaptic sympathetic neurons
22. Short Answer: What is salutatory conduction in a neuron? Is it fast or slow.
23. Which represents the iris?
3
24. Which represents the malleus?
5
25. Loud high pitched sounds bend the organ of Corti hair cells
a. in the portion of the organ of corti away from the helicotrema
b. in the portion of the organ of corti near the helicotrema
c. in the portion of the basilar membrane away from the oval window
d. in the portion of the organ of corti between the oval window and the helicotrema
26. The ciliary body does NOT
a. attach to the lens
b. contract and relax to alter the distance of focal vision
c. sit posterior to the iris
d. attach to the iris
27. Which represents the tectorial membrane? (shown in 2 places) 3
31. Light passes through the following structures of the eye in which order?
a. iris, lens, cornea, aqueous humor, vitreous humor
b. sclera, aqueous humor, vitreous humor, lens
c. aqueous humor, iris, lens, vitreous humor
d. cornea, aqueous humor, lens, vitreous humor
32. Which represents the scala vestibuli? 4
33. Identify all parts represented in the following diagram of cerebrum section.
In order from top to bottom left to right, (arachnoid villus, superior sagittal
sinus, skin, periostium, skull bone, [periostium, meningeal layer] dura
matter, subdural potential space, arachnoid, subarachnoid space, pia matter,
cerebral cortex, white matter)
34. Which represents the epidural space?
6
35. Neurons activated in a patellar tendon reflex would fire in which order?
a. efferent sensory neuron, interneuron, spinal cord, afferent neuron
b. afferent sensory neuron, interneuron, efferent motor neuron
c. afferent sensory neuron, spinal afferent neuron, efferent sensory neuron
d. efferent motor neuron, inter neuron, spinal cord efferent neuron
36. Robob is the lead singer for a heavy metal rock band. He is having trouble
hearing higher pitched sounds. What is the anatomical cause of this probem?
a. the satanic reverences in his songs have cursed his cochlea
b. loud noises damaged the organ of corti hair cells
c. he has developed his organ of corti cells to be more sensitive to lower
pitched sounds and now has trouble hearing high pitches.
d. his band-mate hit him over the side of the head with an electric guitar