Question

your immune systems 2nd line of defense includes an inflammatory response. ____ release histamine causing blood cells to dilate/widen near the injury and make them leak, so white blood cells such as ____ can reach the area and consume the pathogen. mast cells; macrophages white blood cells; mast cells rewatch submit

Explanation:

Mast cells are immune cells that release histamine during inflammation, leading to blood vessel dilation and leakage. Macrophages are white blood cells that phagocytose (consume) pathogens at the injury site. The other option incorrectly pairs cell types: white blood cells do not primarily release histamine (mast cells do), and mast cells are not the pathogen-consuming white blood cells here.

Answer:

Mast cells; macrophages