Human Immunity and Blood

Individuals with blood group O have both anti-A and anti-B antibodies in the plasma.

Correct Answer: Neutrophils > lymphocytes > monocytes > eosinophils > basophils

Interferon is a cytokine barrier.

The regulatory T cells , formerly known as suppressor T cells, are a subpopulation of T cells which modulate the immune system, maintain tolerance to self-antigens, and abrogate autoimmune disease.

IgE also has an essential role in type I hypersensitivity,[7] which manifests various allergic diseases, such as allergic asthma, most types of sinusitis, allergic rhinitis, food allergies, and specific types of chronic urticaria and atopic dermatitis.

They produce beta inteferons.

Secondary lymphatic tissues include spleen, tonsils, lymph vessels, lymph nodes, adenoids, and skin and liver. 

AB positive suggests that an individual has both the antigens A and B. Blood Group AB has both A and B antigen on red cells but with neither A or B antibody in the plasma.

T-cells are derived from bone marrow stem cells and differentiate into immunocompetent cells in the thymus.

The high-walled endothelium of the post-capillary venules (HEV) in lymph nodes express vascular addressins, which are recognised by homing receptors on lymphocytes passing through the afferent lymphatics and which mediate entry of the lymphocytes into the lymph nodes.

Many PRR are lectin-like in that they recognise exposed microbial sugars.

Endothelial cells are not essentially phagocytic, although they do contribute by the production of mediators of the inflammatory process, particularly acute inflammation and were previously lumped together with the mononuclear phagocyte system in what is known as the reticuloendothelial system (RES).

The defensins are peptide antibiotics present in the granules in extremely high concentration.

T-cells are mainly confined to the paracortical (thymus-dependent) area of lymph nodes, and in nodes taken from children with selective T-cell deficiency. The paracortical region is virtually devoid of lymphocytes.

The granules contain a wide spectrum of microbicidal agents.