21. The Immune System

Defensin antimicrobial peptides kill microbes by:

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

Fever is generated by pyrogens that reset the temperature set point of the hypothalamus to a lower value.

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

Neutrophils are a critical component of the response to a parasitic infection.

All of the following are chemical defenses against microbial infection except which of these answers?

What property of antimicrobial peptide allows them to disrupt bacterial cell surfaces?

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

NK cells are cytotoxic cells that lyse and kill cancer cells and cells infected with certain viruses.

The process by which neutrophils squeeze through capillary walls in response to inflammatory signals is called:

a. Diapedesis

b. Chemotaxis

c. Margination

d. Opsonization

Give a function for each of the following:

(l) Interleukins

(m) Tumor necrosis factor

(n) Colony-stimulating factors

More than one choice may apply.

Against which of the following will interferon do some good?

a. Infection of body cells by a virus

b. Circulating free viruses

c. Some types of cancer

d. Bacterial infection

Complement activation promotes all of the following except:

a. Cell lysis

b. Inflammation

c. Opsonization

d. Interferon release

e. Chemotaxis of neutrophils and other cell