ATI LPN
Multiple Choice Questions on Immune System Questions
Question 1 of 5
The best source of active bone marrow from a 20-year-old would be:
Correct Answer: A
Rationale: The iliac crest is the best source for active bone marrow in a 20-year-old because it contains a high concentration of hematopoietic stem cells responsible for blood cell production. It is easily accessible, minimizing risks associated with harvesting. The femur, distal radius, and tibia have lower concentrations of active bone marrow and are less commonly used for bone marrow aspiration. Therefore, the iliac crest is the optimal choice for obtaining active bone marrow in this scenario.
Question 2 of 5
Homan's sign is classified as pain behind the knee
Correct Answer: B
Rationale: The correct answer is B: FALSE. Homan's sign is actually classified as pain in the calf upon passive dorsiflexion of the foot, not behind the knee. This test is used to assess for deep vein thrombosis (DVT). The other choices are incorrect: A is incorrect as Homan's sign is not associated with pain behind the knee, C is incorrect as the sign is consistent in its presentation, and D is incorrect because Homan's sign is not exclusive to DVT.
Question 3 of 5
Chronic lymphocytic leukemia is most common leukemia in what kind of people? Slide 4
Correct Answer: B
Rationale: The correct answer is B: Older adults. Chronic lymphocytic leukemia typically affects individuals over the age of 50, with the average age of diagnosis around 70. This type of leukemia is rare in young adults, children, or middle-aged adults. Risk factors for chronic lymphocytic leukemia include advanced age and a family history of the disease. Therefore, older adults are the most commonly affected demographic group for this type of leukemia.
Question 4 of 5
A 1:20 dilution was made in a unopette, with glacial acetic acid as the diluent. The four corner squares on BOTH sides of the hemacytometer are counted for a total of 100 cells. What is the total WBC (x10^9/L)?
Correct Answer: B
Rationale: The correct answer is B: 2.5. The dilution factor for the hemacytometer is 20, so we must multiply the count of 100 cells by 20 to get the total number of cells per microliter. Given the dilution factor, we then convert cells per microliter to cells per liter by multiplying by 10^6. To convert cells per liter to cells per cubic meter, we multiply by 10^3. Finally, to convert cells per cubic meter to x10^9/L, we divide by 10^9. The correct calculation is (100 cells * 20 * 10^6 * 10^3) / 10^9 = 2.5 x10^9/L. Summary: A: 0.25 - Incorrect, as it does not account for the dilution factor and the subsequent conversions. C: 5 - Incorrect, as it is the result of a miscalc
Question 5 of 5
The lipids of the RBC membrane are arranged:
Correct Answer: D
Rationale: The correct answer is D because the lipids in the RBC membrane are arranged in a phospholipid bilayer structure, with two layers that are not symmetric in composition. This asymmetry is crucial for maintaining the integrity and function of the membrane. The inner and outer layers have different lipid compositions, allowing for specific functions such as signal transduction and selective permeability. Choice A is incorrect because lipids are not arranged in chains beneath a protein exoskeleton in the RBC membrane. Choice B is incorrect because the hydrophobic portions of lipids face each other within the membrane, not the plasma. Choice C is incorrect as lipids are not arranged in a hexagonal lattice in the RBC membrane.