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Which of the following best describes an infection?

The failure of the body to function normally

A diseased section of the body

The invasion of the body by a pathogen and the subsequent symptoms in response to the invasion

The invasion of the body by a disease

Answer and Explanation

The Correct Answer is C

A. The failure of the body to function normally

This is too general and applies to any illness, not specifically infection.

B. A diseased section of the body

This is vague and doesn’t identify causative factors like pathogens.

C. The invasion of the body by a pathogen and the subsequent symptoms in response to the invasion

This accurately defines infection as a host response to pathogen invasion.

D. The invasion of the body by a disease

Diseases don’t invade; pathogens do. This option is not scientifically accurate.

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Correct Answer is D

Explanation

A. Infections:

Infections in older adults are often due to immune suppression, not directly from autoantibodies.

B. Cancer:

While aging does increase cancer risk, autoantibodies do not directly cause cancer.

C. Allergic reaction:

Allergies involve hypersensitivity reactions to external antigens, not the body's own cells.

D. Autoimmune disease:

Autoantibodies target the body's own tissues, leading to autoimmune diseases such as rheumatoid arthritis or lupus, which are more common in older adults.

A. Red, like blood B. Formed when fluid is filtered across the subclavian veins into the tissue spaces C. Formed from tissue fluid D. Pumped by the left heart into systemic circulation

Correct Answer is C

Explanation

A. Red, like blood:

Lymph is typically clear to pale yellow; it lacks red blood cells, which give blood its red color.

B. Formed when fluid is filtered across the subclavian veins into the tissue spaces:

Lymph forms from interstitial (tissue) fluid, not from fluid filtered from veins into tissues.

C. Formed from tissue fluid:

Lymph originates as interstitial fluid that enters lymphatic vessels and is transported back into the circulatory system.

D. Pumped by the left heart into systemic circulation:

Lymph is not pumped by the heart; it moves through the lymphatic system via muscle contractions and valves.

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Which of the following best describes an infection?

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Naxlex Comprehensive Predictor Exams

The nurse knows that older clients have increase of circulating autoantibodies. The nurse knows that this may cause which of the following?

Correct Answer is D

Explanation

Lymph fluid is:

Correct Answer is C

Explanation

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