Small areas on the intestinal walls that contain white blood cells to destroy microorganisms are called:

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Peyer's patches are small areas of lymphoid tissue found in the small intestine. They contain white blood cells called lymphocytes, which help to destroy microorganisms before they can enter the bloodstream. Haustra are pouches or sacs that form along the colon wall. Villi are finger-like projections in the small intestine that help to increase the surface area for absorption. Mucosa is the inner lining of the digestive system.

Small Areas on the Intestinal Walls That Contain White Blood