ATI TEAS Science
ATI TEAS Science 2025/2026 Exam – 100 Verified Questions with
Correct Answers & Detailed Professional Rationales
ASCORERS STUVIA
This Document Contains:
ATI TEAS Science 2025/2026 Exam
100 Multiple Choice Questions with Correct Answers
Detailed Professional Rationales
100% Guaranteed Pass
Complete A+ Guide
, ATI TEAS Science 2025/2026 Exam – 100 Verified
Questions with Correct Answers & Detailed
Professional Rationales
Which of the following best describes negative feedback in endocrine
regulation?
A. A hormone stimulates a process that increases its own secretion indefinitely
B. A hormone’s release is decreased when the effect on the target organ is
achieved
C. Hormone release is unrelated to physiological effects
D. A hormone directly stimulates its own secretion via feed-forward signaling
Ans: B
Rationale: Negative feedback reduces further hormone release when the
physiological effect reaches setpoint, maintaining homeostasis.
In an electrocardiogram, which wave corresponds to atrial
depolarization?
A. P wave
B. QRS complex
C. T wave
D. U wave
Ans: A
,Rationale: The P wave represents atrial depolarization; the QRS complex
represents ventricular depolarization, and the T wave ventricular repolarization.
Which process in the small intestine facilitates digestion of lipids by
increasing the surface area of fats for enzymatic action?
A. Peristalsis only
B. Bile emulsification of lipids into micelles
C. Acidification by gastric secretions
D. Sequestration by pancreatic proteases
Ans: B
Rationale: Bile salts emulsify dietary lipids into micelles, increasing surface area
for pancreatic lipase to digest triglycerides.
Which laboratory value indicates primary respiratory acidosis?
A. Low PaCO2, elevated HCO3−
B. Elevated PaCO2, decreased pH
C. Elevated pH, low HCO3−
D. Normal PaCO2, elevated anion gap
Ans: B
Rationale: Respiratory acidosis results from hypoventilation with elevated
PaCO2 and a resulting decrease in blood pH.
Which cell type is primarily implicated in allergic (Type I
hypersensitivity) reactions by releasing histamine?
A. Neutrophils
B. Eosinophils
, C. Basophils and mast cells
D. Macrophages
Ans: C
Rationale: Mast cells and basophils store and release histamine and other
mediators in IgE-mediated Type I hypersensitivity responses.
Which vitamin deficiency is associated with scurvy due to impaired
collagen synthesis?
A. Vitamin A
B. Vitamin C (ascorbic acid)
C. Vitamin D
D. Vitamin K
Ans: B
Rationale: Vitamin C is a cofactor for prolyl and lysyl hydroxylases required for
collagen cross-linking; deficiency leads to scurvy.
Which physiological change would you expect with hemorrhagic shock in
an adult?
A. Increased preload leading to increased stroke volume
B. Tachycardia as a compensatory response to decreased blood volume
C. Bradycardia due to sympathetic activation
D. Increased blood pressure due to hypovolemia
Ans: B
Rationale: Hemorrhage reduces circulating volume and cardiac output;
ATI TEAS Science 2025/2026 Exam – 100 Verified Questions with
Correct Answers & Detailed Professional Rationales
ASCORERS STUVIA
This Document Contains:
ATI TEAS Science 2025/2026 Exam
100 Multiple Choice Questions with Correct Answers
Detailed Professional Rationales
100% Guaranteed Pass
Complete A+ Guide
, ATI TEAS Science 2025/2026 Exam – 100 Verified
Questions with Correct Answers & Detailed
Professional Rationales
Which of the following best describes negative feedback in endocrine
regulation?
A. A hormone stimulates a process that increases its own secretion indefinitely
B. A hormone’s release is decreased when the effect on the target organ is
achieved
C. Hormone release is unrelated to physiological effects
D. A hormone directly stimulates its own secretion via feed-forward signaling
Ans: B
Rationale: Negative feedback reduces further hormone release when the
physiological effect reaches setpoint, maintaining homeostasis.
In an electrocardiogram, which wave corresponds to atrial
depolarization?
A. P wave
B. QRS complex
C. T wave
D. U wave
Ans: A
,Rationale: The P wave represents atrial depolarization; the QRS complex
represents ventricular depolarization, and the T wave ventricular repolarization.
Which process in the small intestine facilitates digestion of lipids by
increasing the surface area of fats for enzymatic action?
A. Peristalsis only
B. Bile emulsification of lipids into micelles
C. Acidification by gastric secretions
D. Sequestration by pancreatic proteases
Ans: B
Rationale: Bile salts emulsify dietary lipids into micelles, increasing surface area
for pancreatic lipase to digest triglycerides.
Which laboratory value indicates primary respiratory acidosis?
A. Low PaCO2, elevated HCO3−
B. Elevated PaCO2, decreased pH
C. Elevated pH, low HCO3−
D. Normal PaCO2, elevated anion gap
Ans: B
Rationale: Respiratory acidosis results from hypoventilation with elevated
PaCO2 and a resulting decrease in blood pH.
Which cell type is primarily implicated in allergic (Type I
hypersensitivity) reactions by releasing histamine?
A. Neutrophils
B. Eosinophils
, C. Basophils and mast cells
D. Macrophages
Ans: C
Rationale: Mast cells and basophils store and release histamine and other
mediators in IgE-mediated Type I hypersensitivity responses.
Which vitamin deficiency is associated with scurvy due to impaired
collagen synthesis?
A. Vitamin A
B. Vitamin C (ascorbic acid)
C. Vitamin D
D. Vitamin K
Ans: B
Rationale: Vitamin C is a cofactor for prolyl and lysyl hydroxylases required for
collagen cross-linking; deficiency leads to scurvy.
Which physiological change would you expect with hemorrhagic shock in
an adult?
A. Increased preload leading to increased stroke volume
B. Tachycardia as a compensatory response to decreased blood volume
C. Bradycardia due to sympathetic activation
D. Increased blood pressure due to hypovolemia
Ans: B
Rationale: Hemorrhage reduces circulating volume and cardiac output;
