Which of the following types of anemia is characterized by excessive destruction of erythrocytes?
Pernicious
Aplastic
Immunohemolytic
Iron-deficiency
The Correct Answer is C
A. Pernicious anemia is caused by vitamin B12 deficiency due to impaired absorption, not excessive destruction of erythrocytes.
B. Aplastic anemia results from the bone marrow's inability to produce enough blood cells, leading to a deficiency of all blood cell types, rather than the destruction of erythrocytes.
C. Immunohemolytic anemia is characterized by the immune system mistakenly attacking and destroying the body's own erythrocytes, leading to excessive destruction of red blood cells.
D. Iron-deficiency anemia is caused by insufficient iron to produce hemoglobin, resulting in low red blood cell production, but not excessive destruction of erythrocytes.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. The tricuspid valve has three leaflets and is located between the right atrium and right ventricle. It closes during ventricular contraction (systole) but does not have two leaflets.
B. The pulmonic valve has three leaflets and controls blood flow from the right ventricle to the pulmonary artery. It is closed during the systolic phase but is not the correct answer for having two leaflets.
C. The aortic valve has three leaflets and controls blood flow from the left ventricle into the aorta. It also closes during systole, but it does not have two leaflets.
D. The mitral valve, also known as the bicuspid valve, has two leaflets and is located between the left atrium and left ventricle. It closes during systole to prevent backflow of blood into the left atrium.
Correct Answer is D
Explanation
A. Flexion refers to a bending movement that decreases the angle between two body parts, such as bending the knee or elbow, but it does not involve lateral movement away from the body's midline.
B. Adduction is the movement of a body part toward the midline of the body, opposite of what the question describes.
C. Extension refers to a straightening movement that increases the angle between two body parts, such as straightening the arm or leg, but again does not involve lateral movement.
D. Abduction is the correct term for moving a limb or body part away from the midline of the body. In this case, it refers to the lateral movement of the leg away from the body's midline.
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