A nurse is teaching a newly licensed nurse about physiological changes in the digestive system that occur with aging.
The nurse should include older adults might experience which of the following physiological changes?
Increased muscle tone of the bowel.
Increased gastric acid production.
Decreased pH of the stomach.
Decreased intestinal peristalsis.
The Correct Answer is D
Choice A rationale
Aging usually leads to a decrease in muscle tone of the bowel rather than an increase, which can result in slower bowel movements and constipation.
Choice B rationale
Gastric acid production tends to decrease with age, not increase. This can affect the digestion and absorption of nutrients, and also increase the risk of stomach infections.
Choice C rationale
The pH of the stomach tends to become less acidic (increase) as one ages, not decrease. This is often due to the reduced production of gastric acid.
Choice D rationale
Decreased intestinal peristalsis is a common physiological change in older adults. This slowing down of the intestinal movements can lead to constipation and other digestive issues.
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Correct Answer is D
Explanation
Choice A rationale
A sigmoid colostomy usually produces stool that is more formed compared to an ileostomy. This is because the colostomy is created from the sigmoid colon, where water absorption occurs.
Choice B rationale
The stoma should not be painful after the procedure. Pain may indicate complications, and the stoma itself lacks nerve endings.
Choice C rationale
The stoma should be a bright red or pink color, indicating good blood supply. A purple color could suggest ischemia or poor blood flow.
Choice D rationale
A sigmoid colostomy is typically located in the left lower abdomen because the sigmoid colon is situated in this area of the body.
Correct Answer is C
Explanation
Choice A rationale
Toxic levels refer to concentrations of a medication that are high enough to cause harmful effects or poisoning. This is not related to the lowest serum concentration.
Choice B rationale
Peak levels are the highest concentration of a medication in the bloodstream after administration. This occurs after the drug is absorbed and distributed.
Choice C rationale
Trough levels occur when the medication is at its lowest concentration in the bloodstream, typically just before the next dose is due. Monitoring trough levels helps ensure therapeutic effectiveness while avoiding toxicity.
Choice D rationale
Half-life refers to the time it takes for the concentration of a drug in the bloodstream to decrease by half. It is not directly related to the lowest serum concentration at a specific point in time.