What is the major role of oxygen?
Maintains acid-base balance in the body
Triggers chemoreceptors in the body
All of these
Necessary for cellular metabolism
The Correct Answer is D
A. Oxygen does play a role in maintaining acid-base balance indirectly, as it is required for aerobic metabolism, which produces carbon dioxide that is regulated by the body to maintain acid-base balance. However, this is not its primary role.
B. Oxygen does trigger chemoreceptors, but this is more of a secondary function to regulate breathing based on oxygen and carbon dioxide levels.
C. While oxygen has many roles, its most critical function is providing the necessary support for cellular metabolism, which is vital for energy production in cells.
D. Oxygen is essential for cellular metabolism as it is required for the process of oxidative phosphorylation in mitochondria, which produces ATP, the energy currency of cells.
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Related Questions
Correct Answer is B
Explanation
A. Obesity is a common symptom of Cushing syndrome but is not the primary diagnostic criterion. Other tests are needed to confirm the diagnosis.
B. A 24-hour urine collection for cortisol is one of the most common and reliable methods for diagnosing Cushing syndrome. Elevated cortisol levels in the urine are indicative of the syndrome.
C. Chronic renal failure is not related to the diagnosis of Cushing syndrome. While Cushing syndrome may affect renal function, it is not the primary diagnostic tool.
D. Alcoholism can cause symptoms similar to those of Cushing syndrome, but it is not used as a diagnostic criterion. The diagnosis of Cushing syndrome requires specific tests, such as urine cortisol measurement.
Correct Answer is A
Explanation
A. Progeria, also known as Hutchinson-Gilford Progeria Syndrome (HGPS), is characterized by accelerated aging. One of the biochemical changes observed in this condition is an increase in hyaluronic acid levels, which is associated with skin changes and the premature aging process seen in affected individuals.
B. Low levels of glutamate are not characteristic of progeria. Glutamate is a neurotransmitter, and its levels are not typically altered in progeria.
C. High levels of thyroxine are not associated with progeria. Thyroxine levels are related to thyroid function, and there is no direct link between high thyroxine levels and progeria.
D. Low levels of calcitonin are not characteristic of progeria. Calcitonin is a hormone involved in calcium regulation, and its levels are not notably altered in progeria.
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