Which of the following is not a trigger for mass movements of the colon?
The gastrocolic reflex
The duodenocolic reflex
Chyme filling the duodenum
Chyme filling the stomach
The colorectal reflex
The Correct Answer is E
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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. More carbonic acid is formed: The bicarbonate ion (HCO₃⁻) binds with H⁺ from HCl, forming carbonic acid (H₂CO₃), which helps buffer the drop in pH.
B. Hydrochloric acid is neutralized by sodium hydroxide: Sodium hydroxide is not involved in this buffer system; this describes a basic chemical reaction, not physiological buffering.
C. Carbonic acid is converted into bicarbonate: The reverse happens when acid is added-bicarbonate becomes carbonic acid.
D. The blood plasma pH is reduced: The buffer system prevents a large drop in pH by neutralizing the added acid.
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.
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