Questions: Which physiologic change contributes to the development of dehydration in an older adult? Select all that apply. One, some, or all responses may be correct. Diminishing kidney function Decreased thirst sensation Declining gastrointestinal motility Decreased enzyme and mucus secretion in the intestines

The answer is:

• Diminishing kidney function
• Decreased thirst sensation
• Declining gastrointestinal motility

Explanation for each option:

1. Diminishing kidney function: Correct. As people age, their kidney function often declines, which can impair the body's ability to concentrate urine and conserve water, leading to an increased risk of dehydration.

2. Osteopenia and osteoporosis: Incorrect. These conditions are related to bone density and do not directly contribute to dehydration.

3. Decreased thirst sensation: Correct. Older adults often experience a reduced sense of thirst, which can lead to inadequate fluid intake and increase the risk of dehydration.

4. Declining gastrointestinal motility: Correct. Slower gastrointestinal motility can affect the absorption of fluids and nutrients, contributing to dehydration.

5. Decreased enzyme and mucus secretion in the intestines: Incorrect. While this can affect digestion and nutrient absorption, it is not a primary factor in the development of dehydration.

Summary: The physiologic changes that contribute to the development of dehydration in an older adult include diminishing kidney function, decreased thirst sensation, and declining gastrointestinal motility.