Which primary inflammatory mediators are known to promote vasodilation in the initial immune response?

Which primary inflammatory mediators are known to promote vasodilation in the initial immune response?

• A. Histamine, bradykinin, and prostaglandin-E2
• B. Cytokines, leukotrienes, and nitric oxide
• C. Prostaglandin I2, thromboxane, and leukotriene B4
• D. Complement proteins, interleukins, and histamine

Answer: (A)

The selection of histamine, bradykinin, and prostaglandin E2 as primary inflammatory mediators promoting vasodilation in the initial immune response is well-grounded in their roles in inflammation. Histamine is released from mast cells and basophils during an immune response. It is a potent vasodilator, leading to increased blood flow and vascular permeability, which are critical for the delivery of immune cells and substances to the site of injury or infection. Bradykinin is part of the kinin system that is activated during inflammation. It also causes vasodilation and increases vascular permeability, contributing to the classical signs of inflammation, including redness and swelling. Prostaglandin E2 is produced by various cells at the site of inflammation and has a role in promoting vasodilation and increasing vascular permeability as well. It enhances the effects of other inflammatory mediators and is involved in both local and systemic effects during inflammatory responses. Together, these mediators initiate and amplify the inflammatory process by enhancing blood flow to affected areas, facilitating the influx of immune cells, and promoting healing while also contributing to pain and other symptoms associated with inflammation.

The selection of histamine, bradykinin, and prostaglandin E2 as primary inflammatory mediators promoting vasodilation in the initial immune response is well-grounded in their roles in inflammation.

Histamine is released from mast cells and basophils during an immune response. It is a potent vasodilator, leading to increased blood flow and vascular permeability, which are critical for the delivery of immune cells and substances to the site of injury or infection.

Bradykinin is part of the kinin system that is activated during inflammation. It also causes vasodilation and increases vascular permeability, contributing to the classical signs of inflammation, including redness and swelling.

Prostaglandin E2 is produced by various cells at the site of inflammation and has a role in promoting vasodilation and increasing vascular permeability as well. It enhances the effects of other inflammatory mediators and is involved in both local and systemic effects during inflammatory responses.

Together, these mediators initiate and amplify the inflammatory process by enhancing blood flow to affected areas, facilitating the influx of immune cells, and promoting healing while also contributing to pain and other symptoms associated with inflammation.