Aplastic anemia is a disorder in which the bone marrow cells that develop into mature blood cells become damaged. The damaged bone marrow cells can lead to low numbers of red blood cells, white blood cells, and/or platelets. When the cause of aplastic anemia cannot be diagnosed, the cause is likely which of the following?
Radiation exposure
An autoimmune disorder
Chemotherapy drugs
Toxins
The Correct Answer is B
A. Radiation exposure: Radiation exposure can cause aplastic anemia, but if the cause is unknown, it is less likely to be due to a specific and identifiable event like radiation exposure.
B. An autoimmune disorder: When the cause of aplastic anemia cannot be diagnosed, it is often attributed to an autoimmune disorder where the body attacks its own bone marrow cells.
C. Chemotherapy drugs: Chemotherapy drugs can cause aplastic anemia, but this cause would typically be known based on the patient's medical history.
D. Toxins: Toxins can cause aplastic anemia, but like chemotherapy drugs and radiation, this cause would generally be identifiable.
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Related Questions
Correct Answer is A
Explanation
A. The activity of the bone marrow is depressed. Aplastic anemia is a condition where the bone marrow fails to produce sufficient numbers of blood cells, including red cells, white cells, and platelets.
B. Red cells are absent as a result of chronic blood loss. This describes a condition like iron- deficiency anemia, not aplastic anemia.
C. The bone marrow fails to produce lymphocytes. Aplastic anemia affects the production of all blood cells, not just lymphocytes.
D. The kidneys fail to produce red blood cells. This describes anemia of chronic kidney disease, not aplastic anemia. In aplastic anemia, the problem lies with the bone marrow, not the kidneys.
Correct Answer is E
Explanation
A. Vaginal bleeding is not a typical sign of ovulation. Vaginal bleeding occurs during menstruation, which is distinct from ovulation.
B. A slight decrease in basal body temperature may occur before ovulation, not during ovulation itself.
C. Breast tenderness can occur due to hormonal changes during the menstrual cycle, but it is not a direct indicator of ovulation.
D. Decreased sex drive is not a typical symptom of ovulation. In fact, some women may experience an increase in sex drive around ovulation.
E. Lower abdominal pain/cramping, also known as mittelschmerz, is a common symptom of ovulation. It typically occurs on one side of the lower abdomen and can help indicate the timing of ovulation.
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