What is the role of alveolar macrophages? a. to secrete pulmonary surfactant b. to secrete antimicrobial proteins c. to remove pathogens and debris d. to facilitate gas exchange

What is the function of the conchae in the nasal cavity? a. increase surface area b. exchange gases c. maintain surface tension d. maintain air pressure

A decrease in volume leads to a(n) ________ pressure. a. decrease in b. equalization of c. increase in d. zero

Gas flow decreases as ________ increases.

a. resistance

b. pressure

c. airway diameter

d. friction

What causes the delay in delayed hypersensitivity? a. inflammation b. cytokine release c. recruitment of immune cells d. histamine release

Which of the following is an autoimmune disease of the heart? a. rheumatoid arthritis b. lupus c. rheumatic fever d. Hashimoto’s thyroiditis Which of the following is an autoimmune disease of the heart? a. rheumatoid arthritis b. lupus c. rheumatic fever d. Hashimoto’s thyroiditis

Which type of immune response works in concert with cytotoxic T cells against virally infected cells? a. natural killer cells b. complement c. antibodies d. memory

Which type of immune response is most directly effective against bacteria? a. natural killer cells b. complement c. cytotoxic T cells d. helper T cells

When does class switching occur? a. primary response b. secondary response c. tolerance d. memory response When does class switching occur? a. primary response b. secondary response c. tolerance d. memory response

Which enzymes in macrophages are important for clearing intracellular bacteria? a. metabolic b. mitochondrial c. nuclear d. lysosomal

Which of the following prevents the alveoli from collapsing? a. residual volume b. tidal volume c. expiratory reserve volume d. inspiratory reserve volume

Which type of T cell is most effective against viruses? a. Th1 b. Th2 c. cytotoxic T cells d. regulatory T cells

Which structure allows lymph from the lower right limb to enter the bloodstream? a. thoracic duct b. right lymphatic duct c. right lymphatic trunk d. left lymphatic trunk

T cells that secrete cytokines that help antibody responses are called ________. a. Th1 b. Th2 c. regulatory T cells d. thymocytes