HESI A2
Anatomy and Physiology Hesi A2 Practice Test
1. What is the most visible part of the ear?
- A. Ear canal
- B. Cochlea
- C. Organ of Corti
- D. Pinna
Correct answer: D
Rationale: The pinna, also known as the auricle, is the most visible part of the ear. Its external shape and location make it easily noticeable on the side of the head. The pinna helps in capturing sound waves and directing them into the ear canal, where the sound transmission process begins. The other structures listed, the Organ of Corti, Cochlea, and Ear canal, are essential parts of the ear involved in hearing and sound processing, but they are not as visibly prominent as the pinna. Therefore, the correct answer is the pinna because of its external visibility and role in capturing sound waves.
2. What is the best description for the term Aseptic?
- A. Sterilized
- B. Purified
- C. Contaminated
- D. Polluted
Correct answer: B
Rationale: The correct answer is B: 'Purified.' Aseptic means free from contamination or sterile. While 'Sterilized' (choice A) is related to the elimination of all microorganisms, aseptic goes beyond sterilization to ensure freedom from contamination in a broader sense. 'Contaminated' (choice C) and 'Polluted' (choice D) are incorrect as they mean the opposite of aseptic, implying the presence of unwanted or harmful substances.
3. What type of chemical reaction involves the reaction of a compound with oxygen?
- A. Decomposition
- B. Synthesis
- C. Combustion
- D. Single replacement
Correct answer: C
Rationale: The correct answer is C: Combustion. A combustion reaction is characterized by a compound reacting with oxygen. During this process, heat and light are often produced as energy is released in the form of heat. Combustion is a common type of reaction involving organic compounds, like hydrocarbons, reacting with oxygen to produce carbon dioxide and water. Choices A, B, and D are incorrect because decomposition involves a compound breaking down into simpler substances, synthesis involves the combination of two or more substances to form a more complex one, and single replacement involves an element replacing another element in a compound.
4. Archimedes' principle explains the ability to control buoyancy, allowing:
- A. Objects to sink regardless of density differences.
- B. Airplanes to generate lift for flight.
- C. Submarines to adjust their buoyancy for submergence and resurfacing.
- D. Helium balloons to overcome gravity and float.
Correct answer: C
Rationale: Archimedes' principle states that the upward buoyant force acting on an object submerged in a fluid is equal to the weight of the fluid displaced by the object. Submarines control their buoyancy by adjusting the volume of water they displace, which allows them to submerge and resurface. Choice C is correct because it directly relates to the principle of buoyancy and how submarines utilize it. Choices A, B, and D are incorrect because they do not accurately reflect the application of Archimedes' principle in controlling buoyancy for submergence and resurfacing.
5. Before a child undergoes a tonsillectomy, what information should the nurse collect?
- A. The child's birth weight
- B. The age at which they crawled
- C. Whether they have had the measles
- D. Reactions to previous hospitalizations
Correct answer: D
Rationale: Before a child undergoes a tonsillectomy, it is crucial for the nurse to gather information on the child's reactions to previous hospitalizations. This data helps in assessing potential fears or anxiety and in providing the necessary support and preparation for the upcoming tonsillectomy. Understanding the child's past reactions is vital for ensuring their comfort and well-being during the hospital admission and procedure. The other options provided are not directly relevant to the child's upcoming tonsillectomy procedure. Birth weight (Choice A) is not typically a factor considered before a tonsillectomy. The age at which a child crawled (Choice B) is a developmental milestone but not pertinent to the tonsillectomy. Having had measles (Choice C) is important for overall health history but not specifically crucial before a tonsillectomy.
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