The biological function of antibodies

• Activation of complement.
• Binding Fc receptors.
• 3.1 Opsonization promotes phagocytosis.
• 3.2 Mediated allergic reactions.
• 3.3 Antibody-dependent cellular cytotoxicity, ADCC effect.
• Through the placenta.
• Immune regulation.

Examples of antibody functions include neutralization of infectivity, phagocytosis, antibody-dependent cellular cytotoxicity (ADCC), and complement-mediated lysis of pathogens or of infected cells.

1) Antibodies are secreted into the blood and mucosa, where they bind to and inactivate foreign substances such as pathogens and toxins (neutralization). 2) Antibodies activate the complement system to destroy bacterial cells by lysis (punching holes in the cell wall).

Antibodies (immunoglobins) are Y-shaped proteins produced by B cells of the immune system in response to exposure to antigens….Comparison Chart on Differences Between Antigen & Antibody.

T cells are a part of the immune system that focuses on specific foreign particles. Rather than generically attack any antigens, T cells circulate until they encounter their specific antigen. As such, T cells play a critical part in immunity to foreign substances.

1. They bind to antigens (pathogen) and act as opsonins to enhance phagocytosis for phagocytes. 2. Occupy binding sites of antigens inhibiting them from binding onto other cells.

Antibodies contribute to immunity in three ways: preventing pathogens from entering or damaging cells by binding to them (neutralization); stimulating removal of pathogens by macrophages and other cells by coating the pathogen (opsonization); and triggering destruction of pathogens by stimulating other immune responses …

Optimal Result: 87 – 352 mg/dL. Protects against infections of the mucous membranes lining the mouth, airways, and diggestive tract. Found in mucosal areas, such as the gut, respiratory tract and urogenital tract, and prevents colonization by pathogens.