Unit 8, Lessons 1 & 2

Most microscopic organisms are harmless.

• true
• false

An organism, virus, or protein that causes disease is called a _________________.

• pathogen
• antibody

External defenses include all of the following EXCEPT...

• skin
• hair
• nails
• fever

Internal defenses include all of the following except...

• inflamation
• fever
• the immune system
• mucus membranes

A white blood cell that destroys pathogens by digesting them is called a _____________________.

• macrophage
• T cell
• B cell
• antibody

___________________ coordinate the body's response to a pathogen.

• macrophages
• T cells
• B cells
• antibodies

______________________ make antibodies that attach themselves to specific pathogens.

• macrophages
• T cells
• B cells
• antibodies

A specialized protein that attaches itself to a specific antigen to mark it for destruction is called a(n) ________________________.

• macrophage
• T cell
• B cell
• antibody

How does the body build immunity?

• by receiving immunity from a mother
• through vaccinations
• by building memory cells
• all of the above

What is not a challenge the immune system (according to page 551)?

• cancer
• allergies
• HIV and AIDS
• the common cold