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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 {"dropdown-group-1":"B"}

Explanation

A. External urethral orifice: This is the external opening of the urethra, and part of the urethral passageway.
B. Internal urethral sphincter: This is a muscular structure that regulates flow, but it is not a section of the urethral tube itself.
C. Prostatic urethra: This is the part of the male urethra that passes through the prostate gland.
D. Membranous urethra: This portion passes through the urogenital diaphragm in males.
E. Spongy urethra: The longest segment of the male urethra, it runs through the penile (spongy) tissue.

Correct Answer is E

Explanation

A. The gastrocolic reflex: Triggered by food entering the stomach, it stimulates mass movement in the colon.
B. The duodenocolic reflex: Triggered by chyme entering the duodenum, this reflex stimulates colon contractions.
C. Chyme filling the duodenum: This activates the duodenocolic reflex, promoting mass movement.
D. Chyme filling the stomach: This activates the gastrocolic reflex.
E. The colorectal reflex: This reflex is involved in the defecation process-it responds to rectal filling, not in initiating mass movement in the colon. It is not a trigger for mass movement.

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