Unit 5: Chapter 29 (Karch 7th Ed) - Introduction to the Autonomic Nervous System 1. Flashcards
- The central nervous system (CNS) cells, where the impulses for the sympathetic nervous system (SNS)
originate, are located where?
A) Cranium and sacral area of the spinal cord
B) Hypothalamus and the medulla
C) Nerve membranes
D) Thoracic and lumbar sections of the spinal cord
Ans: D
Feedback:
The SNS is also called the thoracolumbar system because the CNS cells, where the impulses for the
SNS originate, are located in the thoracic and lumbar sections of the spinal cord. The parasympathetic
nervous system (PNS) is called the craniosacral system because the CNS neurons, where the impulses
for the PNS originate, are found in the cranium and the sacral area of the spinal cord. Alpha2-receptors
are located on nerve membranes and the hypothalamus and medulla are located where the main nerve
centers for the autonomic nervous system (ANS) are located.
- The nurse assesses that the patient is having a sympathetic response when noting what manifestations?
A) Decrease in sweating, decrease in respirations, and pupil constriction
B) Decrease in heart rate and perfusion, and an increase in inflammatory reactions
C) Increase in blood pressure, bronchodilation, and decreased bowel sounds
D) Increased motility and secretions in the GI tract, and constriction of bronchi and pupils
Ans: C
Feedback:
When stimulated, the sympathetic nervous system prepares the body to flee or to turn and fight (Figure
29.3). Cardiovascular activity increases, as do blood pressure, heart rate, and blood flow to the skeletal
muscles. Respiratory efficiency also increases; bronchi dilate to allow more air to enter with each
breath, and the respiratory rate increases. Pupils dilate to permit more light to enter the eye, to improve
vision in darkened areas (which helps a person to see to fight or flee). Sweating increases to dissipate
heat generated by the increased metabolic activity.
- An anatomy and physiology instructor scratches chalk across the blackboard causing a screeching
sound. Several students get a feeling like their hair is standing on end. This response is part of the
sympathetic stress reaction and is called what?
A) Diaphoresis
B) Diuresis
C) Piloerection
D) Vasoconstriction
Ans: C
Feedback:
The goose flesh or hair standing on end reaction that occurs as part of the stress response is called
piloerection. Diaphoresis refers to sweating. Diuresis is the loss of water through the kidneys.
Vasoconstriction is a muscle contraction in the blood vessel leading to blood vessel narrowing.
- The nurse administers a drug to the patient whose heart rate is bradycardic aimed at increasing heart
rate and myocardial activity. What adrenergic receptor is this drug stimulating?
A) Alpha1
B) Alpha2
C) Beta1
D) Beta2
Ans: C
Feedback:
Beta1-receptors are found in cardiac tissue where they can stimulate increased myocardial activity and
increased heart rate. Alpha1-receptors are found in blood vessels, in the iris, and in the urinary bladder.
Alpha2-receptors are located on nerve membranes and act as modulators of norepinephrine release.
Beta2-receptors are found in smooth muscle in blood vessels, in the bronchi, in the periphery, and in
uterine muscle
- The nurse administers a drug that stimulates the parasympathetic nervous system. What physiological
response would indicate the drug is working?
A) Vasoconstriction
B) Increased gastrointestinal (GI) motility
C) Increased heart rate
D) Pupil dilation
Ans: B
Feedback:
When the parasympathetic nervous system is stimulated, the result is increased GI motility, decreased
GI secretions, decreased heart rate, and pupillary constriction, which all result from stimulation of the
sympathetic nervous system.
- When the nurse administers a drug that stimulates the nicotinic receptors, what manifestation would
indicate the drug is working?
A) Increased gastrointestinal (GI) motility
B) Decrease in heart rate
C) Muscle contraction
D) Pupil constriction
Ans: C
Feedback:
Nicotinic receptors are located in the central nervous system (CNS), the adrenal medulla, the autonomic
ganglia, and the neuromuscular junction. Stimulation of nicotinic receptors causes muscle contractions,
autonomic responses, and release of norepinephrine from the adrenal medulla. Increased GI motility,
decreased heart rate, and pupil constriction are the result of stimulation of the muscarinic receptors.
- A young woman who lives alone comes home at night to find a man in her apartment. What body
responses would be expected for the young woman?
A) Increased blood pressure (BP), increased heart rate, and pupil dilation
B) Decrease sweating, decreased BP, and increased heart rate
C) Pupil constriction, increased respiratory rate, and decreased heart rate
D) Increased sweating, decreased respiratory rate, and increased BP
Ans: A
Feedback:
When stimulated by a stressful or fearful situation, the sympathetic nervous system (SNS) prepares the
body to flee or to turn and fight. Cardiovascular activity increases as do blood pressure, heart rate, and
blood flow to skeletal muscles. Respiratory rate increases, pupils dilate, and sweating increases.
Decrease in sweating, BP, heart rate, respiratory rate, and pupil constriction indicate stimulation of the
parasympathetic nervous system, which would not be stimulated by fear.
- When there is stimulation of the sympathetic nervous system (SNS), blood is diverted away from the
gastrointestinal (GI) tract. What might the nurse assess that would indicate this diversion of blood flow
to the GI tract?
A) Increased blood glucose levels
B) Decreased bowel sounds
C) Increased blood pressure
D) Decreased immune reactions
Ans: B
Feedback:
When blood is diverted away from the GI tract, bowel sounds decrease and digestion slows
dramatically, sphincters are constricted, and bowel evacuation cannot occur. Increased blood glucose
levels, elevated blood pressure, and decreased immune reaction are due to SNS stimulation but are not
concerned with the GI tract.
- A patient is being admitted to the floor following a motor vehicle accident. Because of the stressful
nature of the event, the nurse anticipates the patient will continue to have a sympathetic stress reaction
during the postoperative period. When monitoring the patient’s serum electrolytes, what will the nurse
closely monitor?
A) Increased calcium
B) Decreased potassium
C) Increased chloride
D) Decreased sodium
Ans: B
Feedback:
Aldosterone, also released with adrenal stimulation, retains sodium and water and causes the excretion
of potassium in the urine. As water is retained, sodium is also retained, therefore increasing serum
levels. Chloride levels are unlikely to change significantly. Calcium is not involved
10. What does the body require in order to produce acetylcholine? A) Tyramine B) Tyrosine from the diet C) Choline from the diet D) Bilirubin from the liver
Ans: C
Feedback:
Acetylcholine (ACh) is an ester of acetic acid and an organic alcohol called choline. Cholinergic nerves
use choline, obtained in the diet, to produce ACh. Tyramine and tyrosine are associated with
norepinephrine production. Bilirubin is not a neurotransmitter.
11. Which of these is a neurotransmitter? A) Calcium B) Cholinesterase C) Acetylcholine (ACh) D) Monoamine oxidase
Ans: C
Feedback:
The last step in the production of the neurotransmitter involves choline acetyltransferase, an enzyme
that is also produced within cholinergic nerves. Just like norepinephrine, the ACh is produced in the
nerve and travels to the end of the axons, where it is packaged into vesicles. Calcium is an electrolyte
and not a neurotransmitter. Cholinesterase breaks down acetylcholine and is an enzyme, not a
neurotransmitter. Monoamine oxidase is an enzyme that breaks down norepinephrine.
12. Neurons that use acetylcholine as its neurotransmitter are what type of neurons? A) Cholinergic B) Dopaminergic C) GABA-ergic D) Serotonergic
Ans: A
Feedback:
Neurons that use ACh as their neurotransmitter are called cholinergic neurons. Other options are
incorrect
- The nursing student learns that the hypothalamus serves what purpose?
A) Causes the secretion of adrenocorticotropic hormone (ACTH)
B) Controls voluntary movement
C) Secretes norepinephrine
D) Helps maintain red blood cell production
Ans: A
Feedback:
The hypothalamus causes the secretion of ACTH, leading to a release of the adrenal hormones
including cortisol, which suppresses the immune and inflammatory reactions to preserve energy that
otherwise, might be used by these activities. The hypothalamus does not have a role in controlling
voluntary movement. The adrenal glands secrete norepinephrine. Red blood cells are produced in the
bone marrow and are stimulated to produce the cells by epoetin secreted by the kidney
- Central nervous system drugs bind to receptors embedded in the cell membranes of neurons.
Cholinergic receptors have been classified as what?
A) Muscarinic
B) Hormones
C) Enzymes
D) Proteins
Ans: A
Feedback:
Cholinergic receptors or acetylcholine receptors are found on organs and muscles. They have been
classified as muscarinic receptors and nicotinic receptors. Cholinergic receptors are not classified as
hormones, enzymes, or proteins.
15. What helps to prevent overstimulation of effector sites on nerve membranes? A) Alpha1-receptors B) Alpha2-receptors C) Beta1-receptors D) Beta2-receptors
Ans: B
Feedback:
Alpha2-receptors are located on nerve membranes and act as modulators of norepinephrine release.
When norepinephrine is released from a nerve ending, it crosses the synaptic cleft to react with its
specific receptor site. Some of it also flows back to react with the alpha-receptor on the nerve
membrane. This causes a reflex decrease in norepinephrine release. In this way, the Alpha2-receptor
helps to prevent overstimulation of effector sites
- The sympathetic nervous system (SNS) is associated with a fight-or-flight reaction. What reaction is the
parasympathetic nervous system is associated?
A) Recover and repair
B) Respond and return
C) Rest and digest
D) Calm and peace
Ans: C
Feedback:
Although the SNS is associated with the stress reaction and expenditure of energy, the parasympathetic
nervous system is associated with activities that help the body to store or conserve energy, a rest-anddigest
response.
- The control systems of the body act in many ways to maintain homeostasis. These homeostatic control
systems regulate the functions of the cell, integrate the functions of different organ systems, and do
what else?
A) Control vital functions
B) Feed cells under stress
C) Act on invading organisms
D) Shut down the body at death
Ans: A
Feedback:
In many areas, the parasympathetic nervous system works in opposition to the sympathetic nervous
system. This allows the autonomic system to maintain a fine control over vital functions. This is a
homeostatic control system. Homeostatic control systems do not feed cells when they are under stress,
they do not act on invading organisms, and do they shut down the body at death.
- The nurse administers a medication that stimulates the parasympathetic nervous system (PNS). What
manifestations would indicate the medication is working? (Select all that apply.)
A) Hyperactive bowel sounds
B) Increased saliva production
C) Elevated heart rate
D) Urinary incontinence
E) Constricted pupils
Ans: A, B, E
Feedback: PNS stimulation results in increased motility and secretions in the gastrointestinal (GI) tract to promote
digestion and absorption of nutrients: decreased heart rate and contractility to conserve energy and
provide rest for the heart; constriction of the bronchi, with increased secretions; relaxation of the GI
and urinary bladder sphincters, allowing evacuation of waste products; pupillary constriction, which
decreases the light entering the eye and decreases stimulation of the retina. While urinary sphincters
relax, they do not lose control so incontinence would not be an expected manifestation.
- The nurse administers a parasympathetic stimulator that only stimulates nicotinic receptors. What
effects would the nurse expect to assess? (Select all that apply.)
A) Muscle contraction
B) Slowing heart rate
C) Increased bladder contraction
D) Signs and symptoms of a stress reaction
E) Release of epinephrine from adrenal medulla
Ans: A, D, E
Feedback:
Stimulation of nicotinic receptors causes muscle contractions, autonomic responses such as signs and
symptoms of a stress reaction, and release of norepinephrine and epinephrine from the adrenal medulla.
Stimulation of muscarinic receptors causes pupil constriction, increased gastrointestinal (GI) motility
and secretions (including saliva), increased urinary bladder contraction, and a slowing of the heart rate
- Neurotransmitters are small molecules that exert their actions through specific proteins, called
receptors, embedded in the postsynaptic membrane. Where are neurotransmitters synthesized?
A) In the dendrite terminal
B) In the presynaptic junction
C) In the postsynaptic junction
D) In the axon terminal
Ans: D
Feedback:
Norepinephrine is made by the nerve cells using tyrosine, obtained in the diet. Dihydroxyphenylalanine
(dopa) is produced by a nerve, using tyrosine from the diet and other chemicals. With the help of the enzyme dopa decarboxylase, the dopa is converted to dopamine, which in turn is converted to
norepinephrine in the axon terminals of adrenergic cells. The norepinephrine then is stored in granules
or storage vesicles within the cell.
- The patient is undergoing chronic stress and has a prolonged sympathetic response. What type of drug
could this patient receive to reduce the sympathetic response? (Select all that apply.)
A) A drug that reduces sympathetic response
B) A drug that increases sympathetic response
C) A drug that reduces parasympathetic response
D) A drug that increases parasympathetic response
E) A drug that reduces central nervous system (CNS) response
Ans: A, D, E
Feedback:
Decreasing sympathetic response would reduce the stress response, whereas increasing
parasympathetic response would have the same effect. Although not optional, a medication that slowed
down the entire nervous system would also work. In many areas, the parasympathetic nervous system
works in opposition to the sympathetic nervous system (SNS). This allows the autonomic system to
maintain a fine control over internal homeostasis. For example, the SNS increases heart rate, whereas
the parasympathetic nervous system decreases it. Thus, the autonomic nervous system can influence
heart rate by increasing or decreasing sympathetic activity or by increasing or decreasing
parasympathetic activity.
22. Where are Alpha1-receptors found? (Select all that apply.) A) Blood vessels B) The iris C) Nerve membranes D) Urinary bladder E) Stomach sphincters
Ans: A, B, D
Feedback: Alpha1-receptors are found in blood vessels, in the iris, and in the urinary bladder. Alpha2-receptors are
located on nerve membranes. Option E is a distracter
23. The nurse administers a drug to treat hypertension that causes vasodilation of blood vessels. What is the drug stimulating? A) Alpha1-receptors B) Alpha2-receptors C) Beta1-receptors D) Beta2-receptors
Ans: D
Feedback:
In blood vessels, beta2 stimulation leads to vasodilation. Stimulation of Alpha1-receptors causes
vasoconstriction. Beta1 and Alpha2-receptors are not involved with blood vessels
24. The nurse administers a drug that stimulates beta2 receptors. What type of health condition would this drug treat? A) Heart disease B) High lipid levels C) Diabetes D) Respiratory disease
Ans: D
Feedback:
Beta2-receptors are found in the smooth muscle in blood vessels, in the bronchi, in the periphery, and in
uterine muscle. Beta2-receptors also cause dilation in the bronchi. Beta1-receptor stimulation would
improve some heart disease and are responsible for increased lipolysis. Because beta2-receptors
increase release of glucagon and the breakdown of glycogen, increasing serum glucose levels,
stimulation of these receptors would exacerbate diabetes.
