Describe the structure and function of antibodies

An antibody, also known as an immunoglobulin (Ig), is a protein that is produced by plasma cells after stimulation by an antigen. Antibodies are the functional basis of humoral immunity. Antibodies occur in the blood, in gastric and mucus secretions, and in breast milk. Antibodies in these bodily fluids can bind pathogens and mark them for destruction by phagocytes before they can infect cells.

What You’ll Learn to Do

• Describe the structure of antibodies
• Identify the different classes of antibodies
• Describe the function of antibodies
• Describe immunodeficiency and hypersensitivity

Learning Activities

The learning activities for this section include the following:

• Antibody Structure
• Antibody Classes
• Antibody Functions
• Disruptions in the Immune System
• Self Check: Antibodies