HESI A2 MIDTERM EXAM
COMPREHENSIVE STUDY GUIDE
QUESTIONS & ANSWERS (VERIFIED
ANSWERS) WITH EXPERT
EXPLANATIONS | 2026 – 2027 UPDATE
(PDF)
1. Which organelle is responsible for the detoxification of drugs and the synthesis of lipids
within a eukaryotic cell?
A. Rough Endoplasmic Reticulum
B. Lysosome
C. Golgi Apparatus
D. Smooth Endoplasmic Reticulum
Answer: D
Conceptual Explanation: The Smooth ER is primarily involved in lipid synthesis,
carbohydrate metabolism, and the detoxification of drugs and poisons.
2. In a redox reaction, the substance that loses electrons is said to be:
A. Reduced
B. Neutralized
,C. Catalyzed
D. Oxidized
Answer: D
Conceptual Explanation: Oxidation is the loss of electrons, while reduction is the gain of
electrons (OIL RIG: Oxidation Is Loss, Reduction Is Gain).
3. Which anatomical plane divides the body into superior and inferior portions?
A. Sagittal plane
B. Coronal plane
C. Transverse plane
D. Midsagittal plane
Answer: C
Conceptual Explanation: The transverse (horizontal) plane divides the body into top
(superior) and bottom (inferior) halves.
4. If a patient is prescribed 0.5 grams of a medication and the available tablets are 250 mg
each, how many tablets should be administered?
A. 2 tablets
B. 1 tablet
C. 0.5 tablets
, D. 4 tablets
Answer: A
Conceptual Explanation: 0.5 grams is equivalent to 500 mg. 500 mg divided by 250 mg
per tablet equals 2 tablets.
5. Which of the following describes a state of low blood potassium levels?
A. Hypernatremia
B. Hypercalcemia
C. Hypokalemia
D. Hypoglycemia
Answer: C
Conceptual Explanation: Hypokalemia refers to a lower-than-normal level of potassium
(K+) in the bloodstream.
6. What is the primary function of the valve located between the left atrium and the left
ventricle?
A. To prevent backflow into the right atrium
B. To prevent blood from entering the aorta
C. To regulate blood flow to the lungs
D. To prevent backflow into the left atrium
COMPREHENSIVE STUDY GUIDE
QUESTIONS & ANSWERS (VERIFIED
ANSWERS) WITH EXPERT
EXPLANATIONS | 2026 – 2027 UPDATE
(PDF)
1. Which organelle is responsible for the detoxification of drugs and the synthesis of lipids
within a eukaryotic cell?
A. Rough Endoplasmic Reticulum
B. Lysosome
C. Golgi Apparatus
D. Smooth Endoplasmic Reticulum
Answer: D
Conceptual Explanation: The Smooth ER is primarily involved in lipid synthesis,
carbohydrate metabolism, and the detoxification of drugs and poisons.
2. In a redox reaction, the substance that loses electrons is said to be:
A. Reduced
B. Neutralized
,C. Catalyzed
D. Oxidized
Answer: D
Conceptual Explanation: Oxidation is the loss of electrons, while reduction is the gain of
electrons (OIL RIG: Oxidation Is Loss, Reduction Is Gain).
3. Which anatomical plane divides the body into superior and inferior portions?
A. Sagittal plane
B. Coronal plane
C. Transverse plane
D. Midsagittal plane
Answer: C
Conceptual Explanation: The transverse (horizontal) plane divides the body into top
(superior) and bottom (inferior) halves.
4. If a patient is prescribed 0.5 grams of a medication and the available tablets are 250 mg
each, how many tablets should be administered?
A. 2 tablets
B. 1 tablet
C. 0.5 tablets
, D. 4 tablets
Answer: A
Conceptual Explanation: 0.5 grams is equivalent to 500 mg. 500 mg divided by 250 mg
per tablet equals 2 tablets.
5. Which of the following describes a state of low blood potassium levels?
A. Hypernatremia
B. Hypercalcemia
C. Hypokalemia
D. Hypoglycemia
Answer: C
Conceptual Explanation: Hypokalemia refers to a lower-than-normal level of potassium
(K+) in the bloodstream.
6. What is the primary function of the valve located between the left atrium and the left
ventricle?
A. To prevent backflow into the right atrium
B. To prevent blood from entering the aorta
C. To regulate blood flow to the lungs
D. To prevent backflow into the left atrium
