In acute inflammation, Late-appearing sunburn is an example of
**Question:** In acute inflammation, Late-appearing sunburn is an example of
A. Heat
B. Heat
C. Cold
D. Cold
**Core Concept:** Acute inflammation is a rapid, intense immune response to injury, infection, or irritation that involves swelling, redness, and warmth. Late-appearing sunburn refers to the delayed symptoms and signs that develop after direct exposure to ultraviolet (UV) radiation from the sun or artificial sources.
**Why the Correct Answer is Right:** Late-appearing sunburn is caused by the delayed onset of UV-induced damage to the skin, which leads to inflammation. This inflammation results in the characteristic symptoms and signs of acute inflammation, such as redness, swelling, and warmth. In contrast to the immediate symptoms of acute inflammation, the late-appearing sunburn occurs hours after exposure to UV radiation, making it an example of a late-onset inflammatory response.
**Why Each Wrong Option is Incorrect:**
A. Heat (Option B) is a component of acute inflammation, but late-appearing sunburn is not specifically due to heat. Heat is one of the symptoms of inflammation, but it does not represent the underlying mechanism for the late-appearing sunburn.
C. Cold (Option D) is not the cause of late-appearing sunburn. Cold exposure does not induce inflammation in a similar manner to UV radiation.
**Clinical Pearl:** Late-appearing sunburn is an important clinical point to remember when assessing patients with delayed skin reactions. It is a useful tool for understanding delayed inflammatory responses and the role of UV radiation in causing inflammation. This knowledge can aid in diagnosing and treating conditions with delayed inflammatory responses, such as drug reactions or delayed hypersensitivity reactions.