21. The Immune System

What are the five main classes of immunoglobulins found in humans?

Which of the following antibodies does a person with type B+ blood have in their plasma?

How many classes of human immunoglobulins are there in the immune system?

What is a characteristic of polyclonal antibodies?

Which antibody is the first class of antibody to be secreted in response to an antigen?

Which immunoglobulin (Ig) is the most abundant of circulating antibodies?

Active artificially acquired immunity is a result of __________.

Which part of an antibody recognizes and binds to antigens?

Cytotoxic T cells kill target cells __________.

Which immune cell is able to respond quickly after any subsequent encounter with the same antigen?

Which of the following statements is characteristic of a secondary humoral response?

In humans, what is the approximate half-life of IgA in the blood?

What part of an antibody molecule binds to its targeted antigen?

Which immunoglobulin class is the most abundant antibody in plasma?