The First Cell Type Active in the Innate Response Is

Question

The first cell type active in the innate response is usually a(n)
A) phagocyte.
B) erythrocyte.
C) fibroblast.
D) antibody.

Accepted Answer

The first cell type active in the innate response is usually a phagocyte, such as neutrophils or macrophages, which are responsible for engulfing and destroying invading pathogens. Erythrocytes are not involved in the immune response, fibroblasts are important in tissue repair but not in the initial immune response, and antibodies are a product of the adaptive immune response, which occurs after the innate response.