A wound on a patient's leg has stopped bleeding. The nurse realizes that this is because
1. platelets retracted the clot, reducing leakage.
2. neutrophils have invaded the wound.
3. macrophages have been released into the general circulation.
4. tumor necrosis factor has sealed the wound.
1
Rationale: Shortly after bleeding has stopped and the clot has formed, it retracts, drawing the torn vessel walls into closer proximity, reducing leakage. Clot retraction is largely a function of platelets. Neutrophils do not impact the amount of bleeding from a wound. Macrophages in the general circulation do not impact the amount of bleeding from a wound. Tumor necrosis factor will not seal a wound.
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