HESI A2 V2 Complete Practice Exam 2025 – Full-Length Mock Test with Rationales (All 7 Subjects)

✅ 4. HESI A2 Full-Length Mock Exam – All Subjects
Timed Practice Test with Answer Key & Rationales



📑 Format Overview:

 Subjects Covered: Anatomy & Physiology, Biology, Chemistry, Mathematics,
Grammar, Vocabulary, Reading Comprehension
 Total Questions: 75 (10–12 questions per subject, balanced)
 Answer Key: End of PDF
 Rationales: Short explanations for each answer
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🧪 Section Breakdown:
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1. Anatomy & Physiology – 10 questions
2. Biology – 10 questions
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3. Chemistry – 10 questions
4. Mathematics – 10 questions
5. Grammar – 10 questions
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6. Vocabulary – 10 questions
7. Reading Comprehension – 15 questions
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Part 1:
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📘 HESI A2 Mock Exam

Section 1: Anatomy & Physiology

1. Which organelle is responsible for producing ATP, the cell’s energy currency?
A. Nucleus
B. Ribosome
C. Mitochondrion
D. Endoplasmic reticulum
✅ Correct Answer: C
Rationale: The mitochondrion is the powerhouse of the cell, where ATP is produced via
cellular respiration.

2. What type of tissue covers body surfaces and lines cavities?
A. Muscle tissue
B. Nervous tissue
C. Connective tissue

,D. Epithelial tissue
✅ Correct Answer: D
Rationale: Epithelial tissue serves as a barrier and lines all body surfaces and cavities.

3. The axial skeleton includes all of the following except:
A. Skull
B. Ribs
C. Vertebral column
D. Pelvic girdle
✅ Correct Answer: D
Rationale: The pelvic girdle is part of the appendicular skeleton, not axial.

4. Which part of the brain regulates balance and coordination?
A. Cerebrum
B. Cerebellum
C. Medulla oblongata
D. Hypothalamus
✅ Correct Answer: B
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Rationale: The cerebellum controls fine motor skills and balance.
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5. What is the primary function of red blood cells?
A. Fight infection
B. Clot blood
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C. Carry oxygen
D. Regulate blood pressure
✅ Correct Answer: C
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Rationale: Red blood cells transport oxygen to tissues via hemoglobin.
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6. Which hormone regulates the sleep-wake cycle?
A. Insulin
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B. Estrogen
C. Cortisol
D. Melatonin
✅ Correct Answer: D
Rationale: Melatonin is secreted by the pineal gland and helps regulate circadian rhythms.

7. The nephron is the functional unit of which organ?
A. Liver
B. Kidney
C. Heart
D. Lung
✅ Correct Answer: B
Rationale: Nephrons in the kidneys filter blood and produce urine.

8. What type of joint is the shoulder joint?
A. Hinge
B. Saddle
C. Ball-and-socket
D. Pivot

, ✅ Correct Answer: C
Rationale: The shoulder is a ball-and-socket joint, allowing multidirectional movement.

9. Which part of the respiratory system is the main site of gas exchange?
A. Bronchi
B. Alveoli
C. Trachea
D. Larynx
✅ Correct Answer: B
Rationale: Alveoli are tiny air sacs where oxygen and carbon dioxide are exchanged.

10. Which organ regulates blood sugar by releasing insulin?
A. Pancreas
B. Liver
C. Kidney
D. Thyroid
✅ Correct Answer: A
Rationale: The pancreas produces insulin to help regulate blood glucose levels.
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📘 Section 2: Biology — 10 Questions
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1. What is the basic unit of life?
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A. Atom
B. Cell
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C. Organelle
D. Molecule
✅ Correct Answer: B
Rationale: The cell is the smallest unit of life that can perform all life processes.



2. Which macromolecule serves as the main source of energy for cells?
A. Lipids
B. Proteins
C. Nucleic acids
D. Carbohydrates
✅ Correct Answer: D
Rationale: Carbohydrates are broken down into glucose, a primary energy source.



3. In DNA, adenine always pairs with:
A. Cytosine