ATLS Physiologic Response to Trauma
Practice Test Questions And Correct
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Rationales 2026 Q&A Instant Download
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Question 1
A trauma patient has acute blood loss and develops tachycardia, peripheral
vasoconstriction, and cool skin. Which physiologic response is primarily
responsible?
A. Increased parasympathetic activity
B. Increased sympathetic nervous system activity
C. Decreased catecholamine release
D. Increased vagal stimulation
Answer: Increased sympathetic nervous system activity
Rationale: The sympathetic nervous system increases heart rate, contractility,
and peripheral vasoconstriction during hemorrhage to preserve blood flow to
vital organs.
Question 2
Which hormone is released rapidly in response to significant trauma and
contributes to increased heart rate and vasoconstriction?
,A. Insulin
B. Aldosterone
C. Epinephrine
D. Calcitonin
Answer: Epinephrine
Rationale: Epinephrine is a major catecholamine released during the stress
response and increases cardiac output and vascular tone.
Question 3
A patient with major trauma develops hypotension after substantial blood loss.
Which compensatory mechanism occurs early?
A. Increased renal blood flow
B. Increased gastrointestinal perfusion
C. Decreased systemic vascular resistance
D. Peripheral vasoconstriction
Answer: Peripheral vasoconstriction
Rationale: Peripheral vasoconstriction redirects blood toward the heart and
brain and helps maintain arterial pressure during hemorrhage.
Question 4
Which organ is generally prioritized for blood flow during severe hemorrhagic
shock?
A. Skin
B. Gastrointestinal tract
C. Brain
D. Skeletal muscle
Answer: Brain
Rationale: Compensatory mechanisms preferentially preserve perfusion of vital
organs, particularly the brain and heart.
,Question 5
A trauma patient has persistent hemorrhage. Activation of the renin-angiotensin-
aldosterone system primarily causes:
A. Sodium and water loss
B. Increased urine production
C. Reduced vascular tone
D. Sodium and water retention with vasoconstriction
Answer: Sodium and water retention with vasoconstriction
Rationale: Renin-angiotensin-aldosterone activation promotes vasoconstriction
and renal sodium and water retention, supporting circulating volume.
Question 6
Which finding most strongly suggests inadequate tissue perfusion after trauma?
A. Warm extremities
B. Normal mental status
C. Decreased urine output
D. Increased appetite
Answer: Decreased urine output
Rationale: The kidneys are highly sensitive to reduced perfusion, making oliguria
an important indicator of inadequate circulating volume and shock.
Question 7
What is the primary immediate cardiovascular consequence of acute
hemorrhage?
A. Increased preload
B. Increased circulating volume
C. Decreased venous return
D. Increased stroke volume
Answer: Decreased venous return
, Rationale: Loss of intravascular volume reduces venous return, ventricular
filling, preload, and ultimately stroke volume.
Question 8
A patient develops tachycardia following trauma without obvious external
bleeding. Which mechanism best explains this response?
A. Increased vagal tone
B. Decreased sympathetic activity
C. Compensatory sympathetic activation
D. Increased parasympathetic stimulation
Answer: Compensatory sympathetic activation
Rationale: Tachycardia is an early compensatory response intended to maintain
cardiac output when stroke volume falls.
Question 9
Which equation best describes cardiac output?
A. Blood pressure × heart rate
B. Preload × afterload
C. Heart rate × stroke volume
D. Stroke volume ÷ heart rate
Answer: Heart rate × stroke volume
Rationale: Cardiac output is the product of heart rate and stroke volume and is a
central determinant of systemic perfusion.
Question 10
In early hemorrhagic shock, which change commonly occurs to stroke volume?
A. It increases markedly
B. It remains permanently unchanged
C. It decreases
D. It becomes independent of preload
Practice Test Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant Download
Question 1
A trauma patient has acute blood loss and develops tachycardia, peripheral
vasoconstriction, and cool skin. Which physiologic response is primarily
responsible?
A. Increased parasympathetic activity
B. Increased sympathetic nervous system activity
C. Decreased catecholamine release
D. Increased vagal stimulation
Answer: Increased sympathetic nervous system activity
Rationale: The sympathetic nervous system increases heart rate, contractility,
and peripheral vasoconstriction during hemorrhage to preserve blood flow to
vital organs.
Question 2
Which hormone is released rapidly in response to significant trauma and
contributes to increased heart rate and vasoconstriction?
,A. Insulin
B. Aldosterone
C. Epinephrine
D. Calcitonin
Answer: Epinephrine
Rationale: Epinephrine is a major catecholamine released during the stress
response and increases cardiac output and vascular tone.
Question 3
A patient with major trauma develops hypotension after substantial blood loss.
Which compensatory mechanism occurs early?
A. Increased renal blood flow
B. Increased gastrointestinal perfusion
C. Decreased systemic vascular resistance
D. Peripheral vasoconstriction
Answer: Peripheral vasoconstriction
Rationale: Peripheral vasoconstriction redirects blood toward the heart and
brain and helps maintain arterial pressure during hemorrhage.
Question 4
Which organ is generally prioritized for blood flow during severe hemorrhagic
shock?
A. Skin
B. Gastrointestinal tract
C. Brain
D. Skeletal muscle
Answer: Brain
Rationale: Compensatory mechanisms preferentially preserve perfusion of vital
organs, particularly the brain and heart.
,Question 5
A trauma patient has persistent hemorrhage. Activation of the renin-angiotensin-
aldosterone system primarily causes:
A. Sodium and water loss
B. Increased urine production
C. Reduced vascular tone
D. Sodium and water retention with vasoconstriction
Answer: Sodium and water retention with vasoconstriction
Rationale: Renin-angiotensin-aldosterone activation promotes vasoconstriction
and renal sodium and water retention, supporting circulating volume.
Question 6
Which finding most strongly suggests inadequate tissue perfusion after trauma?
A. Warm extremities
B. Normal mental status
C. Decreased urine output
D. Increased appetite
Answer: Decreased urine output
Rationale: The kidneys are highly sensitive to reduced perfusion, making oliguria
an important indicator of inadequate circulating volume and shock.
Question 7
What is the primary immediate cardiovascular consequence of acute
hemorrhage?
A. Increased preload
B. Increased circulating volume
C. Decreased venous return
D. Increased stroke volume
Answer: Decreased venous return
, Rationale: Loss of intravascular volume reduces venous return, ventricular
filling, preload, and ultimately stroke volume.
Question 8
A patient develops tachycardia following trauma without obvious external
bleeding. Which mechanism best explains this response?
A. Increased vagal tone
B. Decreased sympathetic activity
C. Compensatory sympathetic activation
D. Increased parasympathetic stimulation
Answer: Compensatory sympathetic activation
Rationale: Tachycardia is an early compensatory response intended to maintain
cardiac output when stroke volume falls.
Question 9
Which equation best describes cardiac output?
A. Blood pressure × heart rate
B. Preload × afterload
C. Heart rate × stroke volume
D. Stroke volume ÷ heart rate
Answer: Heart rate × stroke volume
Rationale: Cardiac output is the product of heart rate and stroke volume and is a
central determinant of systemic perfusion.
Question 10
In early hemorrhagic shock, which change commonly occurs to stroke volume?
A. It increases markedly
B. It remains permanently unchanged
C. It decreases
D. It becomes independent of preload
