Physiological Changes in Older Adults Practice Quiz (11 questions)

1. How do López-Otín et al. (2023) characterize aging?

A. A gradual reduction in physical and mental capacity caused primarily by environmental influences and disease

B. A universal change with increasing age that occurs independently of cellular or molecular damage

C. A progressive loss of immune recognition that increases infection risk without affecting other physiological functions

D. A progressive decline in physiological function at cellular and molecular levels, accompanied by accumulated damage and greater vulnerability to disease and death

Answer: (D)

Explanation

López-Otín et al. describe aging as progressive functional decline at cellular and molecular levels, associated with genetic damage, disrupted protein balance, and mitochondrial dysfunction. The description of declining physical and mental capacity reflects the WHO definition rather than this specific characterization.

2. An older adult experiences age-related changes that are compounded by chronic disease and environmental influences. Which type of aging best describes this interaction?

A. Primary aging, because it includes changes caused by environmental exposures over time

B. Secondary aging, because it involves primary aging processes interacting with disease and environmental influences

C. Primary aging, because it is a universal change that occurs as a person grows older

D. Secondary aging, because it refers to molecular damage accumulating independently of disease

Answer: (B)

Explanation

Secondary aging involves the interaction of primary aging processes with environmental influences and disease processes. Primary aging is a plausible alternative, but it is not caused by disease or environmental influences.

3. In the microbiological theory of aging, how can the accumulation of molecular connections damage cell function?

A. Reduced recognition of bacteria and viruses may trigger immune reactions that halt vital biochemical cycles

B. Connected and accumulated molecules may halt vital biochemical cycles, causing further damage that disrupts cell function

C. Declining DHEA production may connect molecules and directly stop biochemical cycles inside aging cells

D. Comorbidities may increase viral vulnerability, causing molecules to adhere and disrupt cell function

Answer: (B)

Explanation

The theory proposes that molecules in aging cells connect, adhere, and accumulate, potentially stopping vital biochemical cycles and causing further cellular damage. Reduced immune recognition can raise infection susceptibility, but it is a distinct age-related change rather than this proposed molecular mechanism.

4. Why are older adults more susceptible to infection as they age?

A. Their physical and mental capacity declines, preventing the immune system from recognizing pathogens

B. Their immune system becomes less able to recognize and fight bacteria and viruses

C. Their DHEA production declines, reducing the immune system’s ability to fight bacteria but not viruses

D. Their cells accumulate connected molecules that directly increase exposure to bacteria and viruses

Answer: (B)

Explanation

With age, the immune system diminishes in its ability to recognize and fight bacteria and viruses, increasing infection susceptibility. Molecular accumulation is a proposed cellular mechanism in the microbiological theory, not the stated explanation for reduced immune recognition.

5. What does age-related slowing of nerve transmission most directly affect?

A. The sensitivity of taste and smell

B. The speed of processing information

C. The strength of muscle contractions

D. The regulation of blood pressure

Answer: (B)

Explanation

Slower nerve transmission with age affects how quickly information is processed. Changes in taste and smell are linked to sensory-system changes, not slower nerve transmission.

6. Which disorder is characterized by acting out dreams during sleep, such as shouting or kicking?

A. Alzheimer's disease

B. Delirium

C. REM sleep behavior disorder

D. Parkinson's disease

Answer: (C)

Explanation

REM sleep behavior disorder involves physically acting out dreams, including behaviors such as shouting or kicking. Delirium can involve severe confusion, but it is a sudden temporary decline in mental function rather than dream enactment during sleep.

7. What role does the cochlea play in age-related changes to hearing?

A. Its weakening raises the threshold for pain.

B. Its atrophy lowers taste-bud regeneration.

C. Its stiffening narrows the visual field.

D. Its deterioration reduces the ability to hear sounds.

Answer: (D)

Explanation

The cochlea is involved in hearing, and its age-related deterioration reduces hearing ability. Narrowing of the visual field is a visual change, not a function of the cochlea.

8. Which pattern of cardiovascular change is associated with aging?

A. Blood pressure decreases as blood vessels become stiffer.

B. The amount of blood pumped by the heart decreases with age.

C. Blood pressure rises because the heart pumps more blood.

D. The amount of blood pumped by the heart increases with age.

Answer: (B)

Explanation

The amount of blood the heart pumps decreases with age. Increased blood pressure can also occur, but it is associated with factors such as hardened blood vessels rather than increased pumping volume.

9. How do morbidity and mortality differ as health risks for older adults?

A. Morbidity refers to the risk of death, while mortality refers to illness burden.

B. Morbidity refers to environmental stress, while mortality refers to disease prevalence.

C. Morbidity refers to illness burden, while mortality refers to the risk of death.

D. Morbidity refers to acute illness, while mortality refers to chronic disease.

Answer: (C)

Explanation

Morbidity describes the presence or burden of illness, whereas mortality concerns death. Acute illness and environmental stress can affect people of any age, so they do not define the distinction between morbidity and mortality.

10. Which organization defines aging as the gradual accumulation of molecular and cellular damage that reduces physical and mental capacity over time?

A. The World Health Organization

B. López-Otín and colleagues

C. The International Labour Organization

D. The United Nations General Assembly

Answer: (A)

Explanation

The World Health Organization describes aging as damage accumulating over time and gradually reducing capacity. López-Otín and colleagues also discuss biological aging, but their definition emphasizes decline at the cellular and molecular levels.

11. As DHEA production declines beginning in a person's 30s, which health risks does the material associate with that decline?

A. Higher stroke risk in women and osteoporosis risk in men

B. Higher heart attack risk in women and breast cancer risk in men

C. Higher osteoporosis risk in women and stroke risk in men

D. Higher breast cancer risk in women and heart attack risk in men

Answer: (D)

Explanation

The described decline in DHEA production is associated with increased breast cancer risk in women and increased heart attack risk in men. The alternative pairing reverses the sex-specific risks given.