Which of the following stimulates the production of new erythrocytes?
Dehydration
Hypoxia
Inflammation
Infection
The Correct Answer is B
A. Dehydration does not directly stimulate the production of erythrocytes. While dehydration can affect blood volume and viscosity, it is not a primary factor in erythropoiesis (the production of red blood cells).
B. Hypoxia (low oxygen levels) stimulates the production of erythropoietin, a hormone produced by the kidneys that promotes the formation of new erythrocytes in the bone marrow. This response helps improve oxygen delivery to tissues.
C. Inflammation triggers the immune response and can affect various blood cell types, but it does not directly stimulate erythropoiesis.
D. Infection can affect blood cell counts, but it is not a direct stimulus for the production of erythrocytes. The body may produce white blood cells as part of the immune response, but not red blood cells specifically.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Magnesium plays a role in many enzymatic reactions and muscle function, but it is not essential for thyroid hormone production.
B. Iodine is an essential element for normal thyroid function. The thyroid gland uses iodine to produce thyroid hormones (T3 and T4), which are critical for regulating metabolism. This is the correct element necessary for thyroid function.
C. Sodium is important for maintaining fluid balance and nerve function, but it is not directly involved in thyroid hormone production.
D. Calcium is important for bone health and cellular processes, but it does not directly influence thyroid hormone synthesis.
Correct Answer is A
Explanation
A. Calcium plays a critical role in blood clotting. It is involved in the coagulation cascade and is necessary for the activation of clotting factors that help stop bleeding.
B. Calcium is not involved in acid buffering. This function is primarily carried out by buffers such as bicarbonate in the blood.
C. While calcium does help regulate some functions of cells and tissues, it does not primarily contribute to extracellular osmotic pressure; this is more a function of proteins and other ions.
D. ATP production mainly occurs in mitochondria and is driven by the metabolism of glucose and fatty acids, not by calcium directly. Calcium does, however, play a role in cellular processes like muscle contraction.
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