Interactive Lecture Quiz

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Interactive Lecture Quiz 5 on Chapter 11- ANS
Chapter 13- Reflexes

• Spring, 2008
• By Patricia L. Mansfield, Ph.D.
• Directions. Take this quiz using your powerpoint
  viewer to test yourself and to get immediate
  feedback on your answer choice.
• I obtained some figures, animations or videos
  from internet classes or from your textbook
  author to demonstrate the important principles
  covered in this quiz.

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3/30/2008
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Overview The Parts of a Reflex

• Stimulus
• Sensory receptor
• Sensory (afferent) neuron
• CNS integration
• Efferent (motor) neuron
• Effector (target tissue)
• Response (movement)

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Overview The Parts of a Reflex
Figure 13-1a Monosynaptic and polysynaptic
somatic motor reflexes
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Types of Skeletal Muscle Reflex Sensory
Receptors the Proprioceptors

• Muscle spindle
• In muscles
• Sense stretch
• Golgi tendon organ
• Near tendon
• Sense force
• Joint receptors
• Sense pressure
• Position

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1. Which statement is true about muscle
spindles?a. They are found in smooth muscle
b. They do not contain muscle fibers.c. They
help prevent muscle damage that would result from
overstretching d. They are regulated by alpha
motoneurons.
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2. The receptor located at the junction of
tendons and skeletal muscle fibers is thea.
muscle spindle. b. Golgi tendon organ c.
neither d. both
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Golgi Tendon Reflex Response to Excessive Force

• Force pulls collagen fibers which squeeze sensors
• Overload causes inhibition of contraction

This is a disynaptic inhibitory reflex arc!
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3. After stretching an intrafusal muscle fiber,
the next event isa. an increase in action
potentials along the associated sensory
neuron.b. a decrease in muscle tension.
c. a decrease in muscle tone.d. decreased
sensitivity to stretching.e. an increase in
action potentials along the associated alpha
motoneuron.
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Somatic Reflex arc

• Identify the afferent and efferent sides of this
  reflex arc
• http//ext.sac.edu/faculty_staff/mansfield_patrici
  a/Animations/reflex_arc.html

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4. The normal, contractile fibers of skeletal
muscle are called _____ fibers.a. intrafusal
b. extrafusal c. alpha d. stretched
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5. How many neurons make up a monosynaptic reflex
arc?a. 1 b. 2 c. 3 d. 4 or more
Neuron 1
Neuron 2
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6. The structure whose abnormal function is
associated with Parkinsons disease is the
_____.a. spinal cord b. basal ganglia c.
cerebellum d. motor cortex
Primary cause Loss of neurons containing
dopamine in the substantia nigra of the midbrain
AND their pathway to the caudate nucleus and
putamen.
http//library.med.utah.edu/neurologicexam/html/ga
it_abnormal.html05
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Overview The ANS
Compare the somatic motor pathway to the
parasympathetic and sympathetic motor pathways
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Overview The ANS Compare the somatic motor
pathway to the parasympathetic and sympathetic
motor pathways
Figure 11-11 (2 of 5)
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Overview The ANS
Table 11-4
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7. ______ is the main enzyme responsible for the
degradation of catecholamines. a. ß1 b.
monoamine oxidase (MAO) c. acetylcholinesterase
(AChE) d. cytochrome oxidase e. lactate
dehydrogenase
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• 8. Sweat glands contain _____ receptors.
• cholinergic receptors
• a receptors c. ß1 d. ß2

Your textbook has an error in a chart. The error
is covered up on the next slide. Here is the
scoop from Wikipedia at en.wikipedia.org!
The sympathetic nervous system supplies sweat
glands, BUT the major neurotransmitter is
acetylcholine. The nerve terminal releases
acetylcholine, which binds to M3 receptors
(muscarinic cholinergic receptors) on the sweat
gland and causes the secretion of sweat.
Acetylcholine is partially degraded by
Cholinesterase enzyme (AchE) thus anything which
interferes with AchE activity causes too much
sweating.
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• 9. Which part of the autonomic nervous
• system innervates sweat glands?
• sympathetic
• parasympathetic
• both
• neither

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10. Which endocrine gland is considered a
modified sympathetic ganglion? a. thyroid b.
anterior pituitary c. pineal d. adrenal
medulla
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10. Which endocrine gland is considered a
modified sympathetic ganglion? a. thyroid b.
anterior pituitary c. pineal d. adrenal
medulla
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11. The target receptor for preganglionic neurons
is the _____ receptor. a. cholinergic nicotinic
b. cholinergic muscarinic c.
adrenergic ß1 d. adrenergic a
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11. The target receptor for preganglionic neurons
is the _____ receptor. a. cholinergic nicotinic
b. cholinergic muscarinic c.
adrenergic ß1 d. adrenergic a
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Answers
1. C 7. B 2. B 8. A 3. A 9. A 4. B 10.
D 5. B 11. A 6. B
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SIGNALING PATHWAYS!
Table 11-2