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Which of the following is NOT a chemical buffer system?

A.

nitrogen

B.

bicarbonate

C.

phosphate

D.

protein

Answer and Explanation

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 {"dropdown-group-1":"C","dropdown-group-2":"C"}

Explanation

A. Intrinsic salivary gland: This is a general category, not a pair of specific glands, so it doesn't answer the two-part question.
B. Lingual; labial: Both lingual and labial glands are intrinsic (minor) salivary glands.
C. Submandibular; lingual: The submandibular gland is one of the major extrinsic salivary glands, while lingual glands are minor intrinsic glands located in the tongue.
D. Submandibular; sublingual: Both are extrinsic salivary glands.
E. Sublingual; parotid: Both are extrinsic glands; the parotid is the largest.
F. Lingual; sublingual: Lingual is intrinsic; sublingual is extrinsic, so the order here is reversed.

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