How do antibodies help defend the body?

Differentiate between a primary and a secondary immune response. Which is more rapid and why?

Antibodies released by plasma cells are involved ina. humoral immunity,b. immediate hypersensitivity reactions,c. autoimmune disorders,d. all of the above.

An investigator at a crime scene discovers some body fluid on the victim's clothing. The investigator carefully takes a sample and sends it to the crime lab for analysis. On the basis of the analysis of antibodies, could the crime lab determine whether the sample is blood plasma or semen? Explain.

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

An anesthesia technician is advised that she should be vaccinated against hepatitis B, which is caused by a virus. She is given one injection and is told to come back for a second injection in a month and a third injection after 6 months. Why is this series of injections necessary?