subclass_of promonocyte
The innate immune ___MASK13___ , also known as the non - specific immune ___MASK13___ or in - born immunity ___MASK13___ , is an important subsystem of the overall immune ___MASK13___ that comprises the cells and mechanisms that defend the host from infection by other organisms . The cells of the innate ___MASK13___ recognize and respond to pathogens in a generic way , but , unlike the adaptive immune ___MASK13___ , the ___MASK13___ does not provide long - lasting immunity to the host . Innate immune systems provide immediate defense against infection , and are found in all classes of plant and animal life . Macrophages ( from ___MASK29___ "  " (" makros ") = large , "  " (" phagein ") = to eat ) are a type of ___MASK38___ that engulfs and digests cellular debris , foreign substances , microbes , cancer cells , and anything else that does not have the types of proteins specific to healthy body cells on its surface in a process called phagocytosis . These large phagocytes are found in essentially all tissues , where they patrol for potential pathogens by amoeboid movement . They take various forms ( with various names ) throughout the body ( e . g ., histiocytes , Kupffer cells , alveolar macrophages , microglia , and others ), but all are part of the mononuclear phagocyte system . Besides phagocytosis , they play a critical role in nonspecific defense ( innate immunity ) and also help initiate specific defense mechanisms ( adaptive immunity ) by recruiting other immune cells such as lymphocytes . For example , they are important as antigen presenters to T cells . In humans , dysfunctional macrophages cause severe diseases such as chronic granulomatous disease that result in frequent infections . Vertebrates comprise all ___MASK100___ of animals within the subphylum Vertebrata ( chordates with backbones ). Vertebrates represent the overwhelming majority of the phylum Chordata , with currently about 64 , 000 ___MASK100___ described . Vertebrates include the jawless fish and the jawed vertebrates , which include the cartilaginous fish ( sharks and rays ) and the bony fish . Monocytes are a ___MASK44___ of ___MASK38___ , or " leukocyte ". They are the largest ___MASK44___ of leukocyte and can differentiate into macrophages and they can acquire some features of dendritic cells . As a part of the vertebrate innate immune system monocytes also influence the process of adaptive immunity . A promonocyte ( or premonocyte ) is a ___MASK61___ arising from a monoblast and developing into a monocyte . Dendritic cells ( DCs ) are ___MASK2___ - presenting cells ( also known as " accessory cells ") of the mammalian immune system . Their main function is to process ___MASK2___ material and present it on the cell surface to the T cells of the immune system . They act as messengers between the innate and the adaptive immune systems . Monoblasts are normally found in ___MASK58___ marrow and do not appear in the normal peripheral blood . They mature into monocytes which , in turn , develop into macrophages . Blood is a ___MASK45___ in humans and other animals that delivers necessary substances such as nutrients and ___MASK23___ to the cells and transports metabolic waste products away from those same cells . ___MASK78___ blood cells ( WBCs ), also called leukocytes or leucocytes , are the cells of the immune ___MASK13___ that are involved in protecting the body against both infectious ___MASK31___ and foreign invaders . All white blood cells are produced and derived from multipotent cells in the ___MASK58___ marrow known as hematopoietic stem cells . Leukocytes are found throughout the body , including the blood and lymphatic ___MASK13___ .