Biology Chapter 29:

A molecule that stimulates an immune-system reaction by B cells and T cells is termed a(n)

antigen

When a baby receives antibodies in breast milk, this is an example of passive immunity. True False

True

An exaggerated attack on a harmless antigen by an overly sensitive immune system is termed a(n)

allergy

Which is an example of humoral immunity?

antibodies produced that destroy an invading pathogen

What is not part of the innate defense response?

antibody production

If a tumor metastasizes, this means that it has moved to another part of the body. Doctors often look in lymph nodes near a tumor for signs of metastasis. Why might cancer cells be found in lymph nodes?

because the lymphatic system collects fluids and cells from tissues

Every year the flu vaccine is designed to protect against three different strains of the influenza virus. Why do scientists typically have to make a new vaccine every year?

because the virus can mutate into new strains

If you observe an immune reaction involving a cytotoxic T cell, it is a

cell mediated response

Although the lymphatic system has many similarities to the circulatory system, what can the lymphatic system accomplish that the circulatory system cannot?

collect bacteria, viruses, cancer cells, and other large particles from body tissues

The substance that when activated triggers a chain reaction that punctures bacterial cell membranes is

complement protein

A phagocyte is a cell that

engulfs other cells and debris

The "master cells" of the immune system that initiate and coordinate the adaptive immune response are

helper T cells

Which is not a major part of the immune system?

pancreas

The second time that an immune system sees an antigen, a secondary immune reaction will take place. False True

true

If a human fetus is ________ and the pregnant woman is ________, an incompatibility that destroys the red blood cells of the fetus may occur.

RH-positive; RH-negative