ATI LPN
Assessment of Hematologic System NCLEX Questions Questions
Question 1 of 5
What is the life span of RBC
Correct Answer: A
Rationale: The correct answer is A: 120 days. Red blood cells (RBCs) have a lifespan of around 120 days. This is because they do not contain a nucleus and other organelles, limiting their ability to repair and maintain themselves. RBCs are constantly being produced and replaced by the bone marrow. Choices B, C, and D are incorrect as they do not align with the established scientific knowledge regarding the lifespan of RBCs. A lifespan of 100, 200, or 80 days is not consistent with the typical turnover rate and function of red blood cells in the body.
Question 2 of 5
At which month of fetal development does the bone marrow become the primary site of hematopoiesis?
Correct Answer: C
Rationale: The correct answer is C, the end of the 6th month. By this time, the bone marrow becomes the primary site of hematopoiesis in fetal development. This is because around this stage, the bones have developed enough to support the production of blood cells. Prior to the end of the 6th month, hematopoiesis mainly occurs in the liver and spleen. Choices A, B, and D are incorrect because by the 2nd, 5th, and end of 7th month respectively, the liver and spleen are still the main sites of hematopoiesis in fetal development.
Question 3 of 5
Which single feature of normal RBCs is most responsible for limiting their life span?
Correct Answer: D
Rationale: The correct answer is D: Loss of nucleus. The absence of a nucleus in red blood cells (RBCs) limits their ability to repair and regenerate, leading to a shorter lifespan. Without a nucleus, RBCs cannot synthesize new proteins or repair damaged DNA, making them more susceptible to wear and tear. The other choices are incorrect because: A: Loss of mitochondria - RBCs naturally lack mitochondria to make space for more hemoglobin, but this feature does not significantly impact their lifespan. B: Increased flexibility of the cell membrane - While flexibility is important for RBCs to navigate through narrow capillaries, it does not directly affect their lifespan. C: Reduction of Hb iron - While iron is crucial for hemoglobin function, a reduction in Hb iron does not directly limit the lifespan of RBCs.
Question 4 of 5
What is the distribution of normal Hb in adults?
Correct Answer: B
Rationale: The correct answer is B (>95% Hb A, <3.5% Hb A2, <1-2% Hb F). In adults, the normal distribution of hemoglobin includes mainly Hb A (>95%), a small percentage of Hb A2 (<3.5%), and an even smaller percentage of Hb F (<1-2%). This distribution is typical in healthy individuals and represents the normal composition of adult hemoglobin. Choice A (80-90% Hb A, 5-10% Hb A2, 1-5% Hb F) and Choice C (90-95% Hb A, 3-5% Hb A2, 1-3% Hb F) are incorrect because they do not reflect the accurate distribution percentages of Hb A, Hb A2, and Hb F in adults. Choice D (85-90% Hb A, 5-7% H
Question 5 of 5
What signs would you expect to see in a patient when diagnosing malaria? (Choose one)
Correct Answer: B
Rationale: The correct answer is B: Fever. In diagnosing malaria, fever is a key symptom due to the cyclic nature of the disease. Malaria typically presents with recurrent bouts of fever, which is caused by the cycle of the parasite invading and multiplying in red blood cells. The other choices (A: Rash, C: Chest pain, D: Hair loss) are not typical signs of malaria. Rash is more commonly seen in diseases like dengue fever, chest pain could be indicative of other conditions like pneumonia or heart issues, and hair loss is not a characteristic symptom of malaria. Therefore, fever is the most characteristic and essential sign to consider when diagnosing malaria.