Human Immunity and Blood

It is because  WBCs are produced in the spleen of a man.

Dendritic cells are a peculiar type of antigen-presenting cells.

Giant cells are the multinucleate cells formed by fusion of macrophages.

Plasma cells produce immunoglobulins of all isotypes including IgE.

They are circulating immature macrophages or dendritic cells.

The respiratory, alimentary and genitourinary tracts are guarded immunologically by subepithelial accumulations of lymphoid tissues.

Part of the pathway is involved in IgE production as well as in Th2 cellular responses.

These are of the myeloid lineage.

 A totally different gene set encodes the T cell receptor for antigen.

T cells recognise processed antigen plus the major histocompatibility complex (MHC) molecules.

B-lymphocytes have antibodies on their cell surface.

The thymus gland is a pink-grey organ that lies underneath the top of the breast bone. In animals it is known as the sweetbreads. The role of the thymus gland is to process lymphocytes, which are white blood cells that travel the body through the bloodstream.

Hemoglobin is the iron-containing protein pigment in red blood cells that gives them their characteristic red color. It binds to oxygen in the lungs and transports it throughout the body. Plasma is the fluid component, while platelets are cell fragments involved in clotting.

Basophils are the white blood cells primarily responsible for releasing histamine and heparin. Histamine promotes inflammation and allergic responses, while heparin acts as an anticoagulant that prevents blood clotting. Neutrophils are phagocytic, eosinophils combat parasites, and monocytes become macrophages.

Erythrocytes is the scientific name for red blood cells (RBCs), derived from Greek 'erythros' (red) and 'kytos' (cell). Leucocytes are white blood cells, thrombocytes are platelets, and plasma is the liquid portion of blood. RBCs contain hemoglobin and transport oxygen throughout the body.