The fourth most common type of leukocyte in a normal blood sample.

 when activated these cells present the antigens to lymphocytes to activate them. They include macrophages and B cells.

Macrophages and other phagocytic cells detect pathogens by their _________

The type of MHC molecules that are found and antigen presenting cells (APCs) such as macrophages and dendritic cells

derived from monocytes, These cells remain is a particular tissue; Example: alveolar macrophages, kupffer cells in liver, microglia

Type of cells that are found in the connective tissue of skin, lungs, and the gastrointestinal tract have a similar function as basophils in that they can release histamine and heparin.

Phagocytic cells are studded with plasma membrane proteins known as toll-like receptors (TLRs) that recognize __________typically found on viral and bacterial cell walls.

Type of leukocyte that kill virus-infected and cancerous cells. Can differentiate into many other cells (killer T, helper T, suppressor T)

Type leukocyte that increase in number during an allergy attack

Neutrophils, basophils, and eosinophils are all considered to be _______ that can be found circulating in the bloodstream

3 types of T lymphocytes

Type of leukocyte that differentiates into plasma cells and secrete antibodies (immunoglobulins)