The lymphoid organ(s) located in the throat that defend(s) against invading bacteria coming in through the mouth and nose is/are __________.

More than one choice may apply.

Where exactly does an antigen bind to an antibody molecule?

Once almost a rite of childhood, tonsillectomy (surgical removal of the tonsils) is now rarely performed. Similarly, while ruptured spleens were once routinely removed, they are now conserved whenever possible. Why should these lymphoid organs be preserved when possible?

A friend tells you that she has tender, swollen 'glands' along the left side of the front of her neck. You notice that she has a bandage on her left cheek that is not fully hiding a large infected cut there. Exactly what are her swollen 'glands,' and how did they become swollen?

The lymphoid organ that functions primarily during youth and then begins to atrophy is:

a. Spleen

b. Thymus

c. Palatine tonsils

d. Bone marrow

The lymphoid organ that filters the blood is the ______, and the lymphoid organ that filters the lymph is the______.