Question 1

With aging, what changes are seen in the elastic recoil and compliance of the lungs?

Accepted Answer

With aging, the elastic recoil of the lungs decreases due to changes in the connective tissue of the lung parenchyma. This decrease in elastic recoil leads to an increase in lung compliance, making the lungs more easily distensible.

Question 2

What of the following is one of the most prominent physiologic changes associated with aging?

Accepted Answer

Reduced airflow expulsion is a prominent physiological change associated with aging, due to factors like decreased lung elasticity and strength of respiratory muscles.

Question 3

Approximately how many people living in the United States are 65 years of age or older?

Accepted Answer

As of my last update in 2023, there are more than 45 million people in the United States who are 65 years of age or older. This reflects the aging population trend in the country.

Question 4

What changes can be expected in arterial venous oxygen content difference C(a-v)O₂ with aging?

Accepted Answer

With aging, the arterial venous oxygen content difference typically decreases due to reduced cardiac output and decreased muscle mass, leading to less oxygen extraction by tissues.

Question 5

In women, how much does the VC decrease per year?

Accepted Answer

In women, the vital capacity (VC) decreases by approximately 20 mL/year. This decline is part of the normal aging process, affecting lung function by reducing the maximum amount of air a person can exhale after maximum inhalation.

Question 6

By age 60, what is the approximate value for the RV/TLC ratio?

Accepted Answer

The RV/TLC ratio, which represents the residual volume to total lung capacity ratio, increases with age due to changes in lung structure and function. By age 60, this ratio is approximately 35%.

Question 7

Which of the following factors may predispose the elderly to anemia?
I. Replacement of red bone marrow in long bones with fatty marrow
II. GI atrophy
III. GI bleeding
Iv. Insufficient income to purchase nutritious food

Accepted Answer

All listed factors can predispose the elderly to anemia: I. Replacement of red bone marrow with fatty marrow reduces the body's ability to produce new blood cells. II. GI atrophy can lead to malabsorption of essential nutrients necessary for blood formation. III. GI bleeding can cause loss of blood. IV. Insufficient income to purchase nutritious food can lead to dietary deficiencies that contribute to anemia.

Question 8

What change in D_LCO is expected over the course of adult life?

Accepted Answer

D_LCO (diffusing capacity of the lungs for carbon monoxide) typically decreases by about 20% over the course of adult life due to factors like aging, which affects lung structure and function.

Question 9

After age 20, how much does the FEV₁ decrease for males?

Accepted Answer

The answer of After age 20, how much does the...

Question 10

At what adult age does the PaO₂ generally start to decline?

Accepted Answer

The partial pressure of oxygen (PaO2) in the blood typically begins to decline around the age of 45 due to changes in lung function and efficiency as part of the natural aging process.

Question 11

What effect does aging have on PaCO₂ in the healthy adult?

Accepted Answer

In healthy adults, PaCO2 typically remains constant throughout adult life because the respiratory system maintains its ability to regulate carbon dioxide levels effectively despite aging.

Question 12

By age 70, how much does the VC generally decrease?

Accepted Answer

The answer of By age 70, how much does the...

Question 13

By what age do most of the pulmonary function indices reach their maximum levels?

Accepted Answer

Pulmonary function indices typically reach their maximum levels by the age of 20-25 years, after which they may plateau or begin to gradually decline.

Question 14

What changes would be expected in RV, VC and TLC with aging?

Accepted Answer

With aging, residual volume (RV) tends to increase due to decreased elastic recoil of the lungs and chest wall, vital capacity (VC) decreases as a result of reduced muscle strength and chest wall compliance, and total lung capacity (TLC) remains relatively constant because the increase in RV compensates for the decrease in VC.

Question 15

During exertion, how does the body compensate for the decreased compliance of the respiratory system associated with aging?

Accepted Answer

During exertion, the body compensates for the decreased compliance of the respiratory system associated with aging by increasing the respiratory frequency. This is because the decreased compliance makes it more difficult to expand the lungs, so the body must breathe more frequently to maintain the same minute ventilation.

Question 16

How does the work expenditure of a 60-year-old to overcome static mechanical forces during normal breathing compare to that of a 20-year-old?

Accepted Answer

The work expenditure of a 60-year-old to overcome static mechanical forces during normal breathing is higher than that of a 20-year-old due to age-related changes in the respiratory system, such as decreased elasticity of the lungs and chest wall stiffness, making breathing more labor-intensive for older adults.

Question 17

After what age do the alveoli start to progressively deteriorate and enlarge?

Accepted Answer

The answer of After what age do the alveoli start...

Question 18

What change can be expected in alveolar dead space ventilation throughout adult life?

Accepted Answer

Alveolar dead space ventilation increases by approximately 1 mL/year throughout adult life. This is due to the gradual decrease in efficiency of gas exchange in the lungs as one ages.

Question 19

How is the ventilatory response to hypoxia affected in healthy men over age 65?

Accepted Answer

In healthy men over age 65, the ventilatory response to hypoxia is decreased by more than 50% due to age-related changes in respiratory function and chemoreceptor sensitivity.

Question 20

With aging, what changes can be expected in the costal cartilages and thoracic compliance?

Accepted Answer

With aging, the costal cartilages tend to calcify, which can cause the ribs to slant downward. This change in the structure of the thorax makes it less compliant, meaning it becomes harder for the thorax to expand and contract, affecting breathing.

Quiz 11: Aging and the Cardiopulmonary System

With aging, what changes are seen in the elastic recoil and compliance of the lungs?

What of the following is one of the most prominent physiologic changes associated with aging?

Approximately how many people living in the United States are 65 years of age or older?

What changes can be expected in arterial venous oxygen content difference C(a-v) O₂ with aging?

In women, how much does the VC decrease per year?

By age 60, what is the approximate value for the RV/TLC ratio?

Which of the following factors may predispose the elderly to anemia? I. Replacement of red bone marrow in long bones with fatty marrow II. GI atrophy III. GI bleeding Iv. Insufficient income to purchase nutritious food

What change in D_LCO is expected over the course of adult life?

After age 20, how much does the FEV₁ decrease for males?

At what adult age does the PaO₂ generally start to decline?

What effect does aging have on PaCO₂ in the healthy adult?

By age 70, how much does the VC generally decrease?

By what age do most of the pulmonary function indices reach their maximum levels?

What changes would be expected in RV, VC and TLC with aging?

During exertion, how does the body compensate for the decreased compliance of the respiratory system associated with aging?

How does the work expenditure of a 60-year-old to overcome static mechanical forces during normal breathing compare to that of a 20-year-old?

After what age do the alveoli start to progressively deteriorate and enlarge?

What change can be expected in alveolar dead space ventilation throughout adult life?

How is the ventilatory response to hypoxia affected in healthy men over age 65?

With aging, what changes can be expected in the costal cartilages and thoracic compliance?

Quiz 11: Aging and the Cardiopulmonary System

With aging, what changes are seen in the elastic recoil and compliance of the lungs?

What of the following is one of the most prominent physiologic changes associated with aging?

Approximately how many people living in the United States are 65 years of age or older?

What changes can be expected in arterial venous oxygen content difference C(a-v) O2 with aging?

In women, how much does the VC decrease per year?

By age 60, what is the approximate value for the RV/TLC ratio?

Which of the following factors may predispose the elderly to anemia? I. Replacement of red bone marrow in long bones with fatty marrow II. GI atrophy III. GI bleeding Iv. Insufficient income to purchase nutritious food

What change in DLCO is expected over the course of adult life?

After age 20, how much does the FEV1 decrease for males?

At what adult age does the PaO2 generally start to decline?

What effect does aging have on PaCO2 in the healthy adult?

By age 70, how much does the VC generally decrease?

By what age do most of the pulmonary function indices reach their maximum levels?

What changes would be expected in RV, VC and TLC with aging?

During exertion, how does the body compensate for the decreased compliance of the respiratory system associated with aging?

How does the work expenditure of a 60-year-old to overcome static mechanical forces during normal breathing compare to that of a 20-year-old?

After what age do the alveoli start to progressively deteriorate and enlarge?

What change can be expected in alveolar dead space ventilation throughout adult life?

How is the ventilatory response to hypoxia affected in healthy men over age 65?

With aging, what changes can be expected in the costal cartilages and thoracic compliance?

What changes can be expected in arterial venous oxygen content difference C(a-v) O₂ with aging?

What change in D_LCO is expected over the course of adult life?

After age 20, how much does the FEV₁ decrease for males?

At what adult age does the PaO₂ generally start to decline?

What effect does aging have on PaCO₂ in the healthy adult?