HESI RN
Biology Test
1. Why does ice have the capability of floating on water?
- A. It has a higher viscosity
- B. It has a different chemical composition
- C. It has a high specific heat
- D. It forms a lattice when freezing
Correct answer: D
Rationale: The correct answer is D. Ice forms a lattice structure when it freezes, which makes it less dense than liquid water, allowing it to float. Choice A is incorrect because viscosity refers to a fluid's resistance to flow and is not related to ice floating. Choice B is incorrect as ice and liquid water have the same chemical composition (H2O). Choice C is incorrect because the high specific heat of water is not the reason why ice floats.
2. A client with hyperthyroidism is being treated with radioactive iodine. The nurse should teach the client to expect which of the following side effects?
- A. Increased heart rate
- B. Hypothyroidism
- C. Hypercalcemia
- D. Weight loss
Correct answer: B
Rationale: When a client with hyperthyroidism undergoes radioactive iodine treatment, it often leads to hypothyroidism due to the destruction of thyroid tissue. This occurs as a desired outcome of the treatment to reduce the overactive thyroid function. Choices A, C, and D are incorrect. Increased heart rate, hypercalcemia, and weight loss are not expected side effects of radioactive iodine treatment for hyperthyroidism. Instead, the goal is to suppress the overactive thyroid, leading to a hypothyroid state.
3. A client is receiving a blood transfusion and develops chills and back pain. What is the nurse's first action?
- A. Stop the transfusion and notify the healthcare provider.
- B. Monitor the client's vital signs every 15 minutes.
- C. Administer a PRN dose of diphenhydramine.
- D. Prepare to administer an antihistamine.
Correct answer: A
Rationale: The correct first action for the nurse is to stop the transfusion and notify the healthcare provider. These symptoms suggest a transfusion reaction, and stopping the transfusion is crucial to prevent further complications. Notifying the healthcare provider ensures timely intervention and appropriate management for the client's condition. Monitoring vital signs, administering diphenhydramine, or preparing to administer an antihistamine can be considered after stopping the transfusion and seeking guidance from the healthcare provider. However, the immediate priority is to halt the transfusion and inform the provider.
4. A 13-year-old client with type 1 diabetes is admitted to the hospital with a blood glucose level of 450 mg/dL. The client is lethargic and has fruity-smelling breath. What is the nurse’s priority action?
- A. Administer insulin as prescribed
- B. Start an IV infusion of normal saline
- C. Check the client’s urine for ketones
- D. Monitor the client’s vital signs
Correct answer: B
Rationale: The correct priority action for the nurse is to start an IV infusion of normal saline. The client's presentation with lethargy, fruity-smelling breath, and high blood glucose level indicates diabetic ketoacidosis (DKA). IV fluids are essential to correct dehydration and help stabilize the client's condition. Checking for ketones in the urine is important, but fluid replacement takes precedence to address the immediate risk of dehydration and electrolyte imbalances. Administering insulin is also a crucial intervention for DKA, but fluid resuscitation should first be initiated.
5. A middle-aged adult with a family history of CAD has the following: total cholesterol 198 (11 mmol/L); LDL cholesterol 120 (6.7 mmol/L); HDL cholesterol 58 (3.2 mmol/L); triglycerides 148 (8.2 mmol/L); blood sugar 102 (5.7 mmol/L); and C-reactive protein (CRP) 4.2. The health care provider prescribes a statin medication and aspirin. The client asks the nurse why these medications are needed. Which is the best response by the nurse?
- A. The labs indicate severe hyperlipidemia and the medications will lower your LDL, along with a low-fat diet.
- B. The triglycerides are elevated and will not return to normal without these medications.
- C. The CRP is elevated indicating inflammation seen in cardiovascular disease, which can be lowered by the medications prescribed.
- D. These medications will reduce the risk of type 2 diabetes.
Correct answer: C
Rationale: CRP is a marker of inflammation, which is elevated in cardiovascular disease. Statins and aspirin help lower CRP and reduce the risk of heart attacks and strokes.