Which statement about nonspecific (innate immunity) is true?.
It is an acquired immunity.
It retains a memory of a pathogen after defeating it.
It offers protection against a particular pathogen.
It is present at birth.
The Correct Answer is D
Choice A rationale:
Innate immunity is not an acquired immunity. Acquired immunity refers to immunity that develops after exposure to a specific pathogen.
Choice B rationale:
Innate immunity does not retain a memory of a pathogen after defeating it. This is a characteristic of adaptive immunity.
Choice C rationale:
Innate immunity does not offer protection against a particular pathogen. It provides a general defense against a wide range of invaders.
Choice D rationale:
Innate immunity is present at birth. It provides a fast response that involves first- and second-line defenses.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A rationale:
Sinusoids are a type of capillary found in some organs, such as the liver, bone marrow, and spleen. They are not vessels that carry blood away from the heart.
Choice B rationale:
Veins are blood vessels that carry blood from the body back into the heart.
Choice C rationale:
Capillaries are delicate blood vessels that deliver blood, nutrients and oxygen to cells throughout the body. They do not carry blood away from the heart.
Choice D rationale:
Arteries are blood vessels that carry oxygenated blood away from the heart to the body.
Correct Answer is A
Explanation
hoice A rationale:
Inspired gas passes through the convoluted air passages of the nasopharynx and pharynx which generates turbulence. This turbulence increases evaporative heat exchange between the air and the mucosa. The nasal mucosa is the lining of the nasal cavity. It moistens air that is coming into the body during inhalation.
Choice B rationale:
The sphenoid is a bone located within the skull and does not directly contribute to the heating and humidification of air.
Choice C rationale:
The nasopharynx is part of the pharynx, located above the soft palate. It serves as an air passage way connecting the nasal cavity to the throat and does not directly heat or humidify the air.
Choice D rationale:
The oropharynx is also part of the pharynx, located between the soft palate and the epiglottis. It serves as a passageway for both air and food but does not directly heat or humidify the air.
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