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How do nasal blood vessels respond in cases of infection, inflammation, or allergy?

They constrict, leading to decreased blood flow

They dilate, causing fluid transudation into tissue spaces

The response of nasal blood vessels during instances of infection, inflammation, or allergy is characterized by dilation, which leads to increased blood flow to the area. This dilation results in the permeability of the blood vessel walls, allowing fluids and proteins to transude into the surrounding tissues. This process contributes to the classic symptoms associated with inflammation, such as swelling, redness, and heat in the affected tissues, which are intended to facilitate the immune response by bringing more immune cells to the site of the issue.

Dilation also assists in clearing out pathogens, as increased blood flow can enhance the delivery of antibodies and white blood cells. This is a critical aspect of the body's defense mechanism, highlighting why the response of nasal blood vessels is crucial during times of infectious or allergic challenges.

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They remain unchanged, with normal functioning

They rupture, leading to bleeding

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