PNB 2265 - EXAM 2 QUESTIONS AND
ANSWERS
Compared to a primary immune response, during the secondary immune response to
bacterial antigen, ______ . - Correct Answers -Memory B cells respond faster.
Assume normal pH and body temperature, and resting conditions. The hemoglobin-
oxygen (HbO2) dissociation curve shows us that at a PO2 characteristic of systemic
venous blood, _________ . - Correct Answers -Hb is about 75% saturated with oxygen
The type II alveolar cells function to ________ . - Correct Answers -Produce a secretion
that reduces surface tension of alveolar fluid
Intact skin and mucus membranes provide a first line of defense against infection by
microbes - Correct Answers -True
The immune response to viral antigen can involve both cell- and antibody-mediated
defenses. - Correct Answers -True
Functions of the respiratory system include _______ . - Correct Answers -Regulation of
blood H+ concentration.
Defense against microbes.
Excretion of CO2
The enzyme carbonic anhydrase is found in red blood cells. In the TISSUES (systemic
capillaries), it catalyzes the reaction that ________ . - Correct Answers -Produces
HCO3- from CO2
Which is the correct sequence of events for activation of a specific helper T cell? (Note:
IL = Interleukin) - Correct Answers -Antigen presentation, costimulation, secretion of IL-
1, helper T cell division.
Which of the following signals is most effective at stimulating central chemoreceptors to
produce increased ventilation? - Correct Answers -Decreased pH of the cerebrospinal
fluid
In response to an increase in alveolar PO2, a pulmonary arteriole will dilate. - Correct
Answers -True.
Helper T cytokines ________ . - Correct Answers -Stimulate cloning of selected B cells
Include IL-2 (Interleukin 2)
Include gamma Interferon (Type II Interferon)
ANSWERS
Compared to a primary immune response, during the secondary immune response to
bacterial antigen, ______ . - Correct Answers -Memory B cells respond faster.
Assume normal pH and body temperature, and resting conditions. The hemoglobin-
oxygen (HbO2) dissociation curve shows us that at a PO2 characteristic of systemic
venous blood, _________ . - Correct Answers -Hb is about 75% saturated with oxygen
The type II alveolar cells function to ________ . - Correct Answers -Produce a secretion
that reduces surface tension of alveolar fluid
Intact skin and mucus membranes provide a first line of defense against infection by
microbes - Correct Answers -True
The immune response to viral antigen can involve both cell- and antibody-mediated
defenses. - Correct Answers -True
Functions of the respiratory system include _______ . - Correct Answers -Regulation of
blood H+ concentration.
Defense against microbes.
Excretion of CO2
The enzyme carbonic anhydrase is found in red blood cells. In the TISSUES (systemic
capillaries), it catalyzes the reaction that ________ . - Correct Answers -Produces
HCO3- from CO2
Which is the correct sequence of events for activation of a specific helper T cell? (Note:
IL = Interleukin) - Correct Answers -Antigen presentation, costimulation, secretion of IL-
1, helper T cell division.
Which of the following signals is most effective at stimulating central chemoreceptors to
produce increased ventilation? - Correct Answers -Decreased pH of the cerebrospinal
fluid
In response to an increase in alveolar PO2, a pulmonary arteriole will dilate. - Correct
Answers -True.
Helper T cytokines ________ . - Correct Answers -Stimulate cloning of selected B cells
Include IL-2 (Interleukin 2)
Include gamma Interferon (Type II Interferon)
