Which of the following is NOT a chemical buffer system?
nitrogen
bicarbonate
phosphate
protein
The Correct Answer is A
A. Nitrogen: Nitrogen is a gas and a component of proteins and nucleic acids, but it does not function as a buffer system in the body.
B. Bicarbonate: The bicarbonate buffer system is the primary buffer system in the extracellular fluid, regulating blood pH.
C. Phosphate: The phosphate buffer system operates mainly in the intracellular fluid and renal tubules.
D. Protein: Proteins, especially hemoglobin, act as buffers by binding or releasing hydrogen ions.
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Related Questions
Correct Answer is A
Explanation
A. Nitrogen: Nitrogen is a gas and a component of proteins and nucleic acids, but it does not function as a buffer system in the body.
B. Bicarbonate: The bicarbonate buffer system is the primary buffer system in the extracellular fluid, regulating blood pH.
C. Phosphate: The phosphate buffer system operates mainly in the intracellular fluid and renal tubules.
D. Protein: Proteins, especially hemoglobin, act as buffers by binding or releasing hydrogen ions.
Correct Answer is A
Explanation
A. Gastrin: G cells secrete gastrin, a hormone that stimulates parietal cells to produce hydrochloric acid and promotes gastric motility. It is released in response to food components like peptides, caffeine, and a rise in pH.
B. Pepsin: Pepsin is an enzyme that digests proteins, but it is secreted as pepsinogen by chief cells, not G cells.
C. Ghrelin: Ghrelin is a hunger-stimulating hormone, secreted primarily by cells in the stomach fundus, not by G cells.
D. Hydrochloric acid: Hydrochloric acid is secreted by parietal cells, not G cells.
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