Final answer:
Increased blood flow carries white blood cells to the site of injury as part of the body's inflammatory response. This process furnishes the site with immune cells that help to fight off infection and support tissue healing.
Step-by-step explanation:
How does the circulatory system and immune system work together to respond to an injury? The correct response is that increased blood flow carries white blood cells to the site of the injury. When an injury occurs, the body's inflammatory response is activated, and part of this response involves increasing blood flow to the injured area. This process, known as vasodilation, allows for more immune cells, especially leukocytes, to reach the site of injury. Leukocytes include monocytes, which become macrophages, and lymphocytes, all of which play key roles in the immune response. They can eliminate pathogens through phagocytosis and help in healing the tissue. Inflammation is a complex biological response that brings more nutrient-rich, oxygenated blood to the tissue, which also facilitates the exchange of O2 and CO2 and the removal of debris and pathogens.