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Mrs. X was getting out of her car, when she slammed the car door on her knee, hurting it quite badly, even though there was no broken skin or bleeding. The knee became very swollen and painful within

Mrs. X was getting out of her car, when she slammed the car door on her knee, hurting it quite badly, even though there was no broken skin or bleeding. The knee became very swollen and painful within the first couple of hours of the injury, making it difficult to walk, so Mrs. X went to an emergency room to check her knee.

  1. Explain what happened here at the cellular level (use the inflammatory reaction cascade to answer step by step).
  2. When Mrs. X came to the ER, the X-rays of her knee were taken, revealing no fracture. Doctor recommended ice packs to help reduce the swelling. What is the purpose of the ice packs? Explain at the cellular level.
  3. The doctor also prescribed Ibuprofen for inflammation and pain. Explain how that helps at the cellular level.

Expert Solution Preview

Introduction:
It is important to understand the cellular processes that take place during an injury, in order to provide effective medical treatment. In this scenario, Mrs. X has injured her knee, resulting in swelling and pain. We will discuss the cellular reactions that occur during an injury, as well as the use of ice packs and Ibuprofen to manage the symptoms.

1. At the cellular level, an inflammatory reaction cascade takes place in response to tissue injury. The first step is the release of chemicals, such as histamine and prostaglandins, which cause blood vessels to dilate and become more permeable. This results in an influx of fluid and white blood cells to the injured area, leading to swelling and redness. The white blood cells then release enzymes and other chemicals to break down damaged tissue and prevent infection. This process can also cause pain due to the sensitization of nerves in the area.

2. Ice packs are used to manage the symptoms of swelling and pain by constricting the blood vessels in the affected area. This reduces the amount of fluid and white blood cells that can enter the area, and therefore reduces swelling. Ice also helps to numb the area, which can reduce pain sensation.

3. Ibuprofen is a nonsteroidal anti-inflammatory drug (NSAID) that works by blocking the production of prostaglandins. Prostaglandins are responsible for the dilation of blood vessels and the sensitization of pain fibers, both of which contribute to the symptoms of inflammation. By blocking prostaglandin production, Ibuprofen reduces inflammation and pain at the cellular level. It is important to note that NSAIDs can have side effects and should be taken as directed by a healthcare professional.

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