First cell to migrate into a wound due to chemotaxis to sta the process of wound healing is –
**Core Concept**
Chemotaxis is a crucial process in wound healing where cells migrate towards chemical signals, such as cytokines and growth factors, to initiate repair. In the early stages of wound healing, the first cell to migrate into a wound due to chemotaxis is essential for the process to begin.
**Why the Correct Answer is Right**
The first cell to migrate into a wound due to chemotaxis is the neutrophil. Neutrophils are attracted to the wound site by chemokines, such as CXCL8, and other inflammatory mediators. They play a key role in eliminating bacteria and debris from the wound, creating an environment conducive to further healing. The migration of neutrophils to the wound site is facilitated by the upregulation of adhesion molecules on the surface of endothelial cells, allowing neutrophils to adhere and transmigrate into the wound.
**Why Each Wrong Option is Incorrect**
**Option A:** Lymphocytes are not the first cells to migrate into a wound due to chemotaxis. While lymphocytes do play a role in wound healing, particularly in the later stages of the process, they are not the primary responders to chemotactic signals in the wound environment.
**Option B:** Macrophages are also not the first cells to migrate into a wound due to chemotaxis. While macrophages are essential for the resolution of inflammation and the initiation of tissue repair, they are not the primary responders to chemotactic signals in the early stages of wound healing.
**Option C:** Platelets are not cells that migrate into a wound due to chemotaxis. Platelets are involved in the initial hemostatic response to injury, releasing growth factors and other signaling molecules that promote the migration of other cells into the wound site.
**Clinical Pearl / High-Yield Fact**
In the context of wound healing, chemotaxis is a critical process that allows cells to migrate towards areas of injury or inflammation. Understanding the role of chemotaxis and the specific cells involved, such as neutrophils, is essential for developing effective treatments for wounds and other inflammatory conditions.
**✓ Correct Answer: D. Neutrophil**