BMS 300 Exam 4 UPDATED Exam
Questions and CORRECT Answers
Epithelial cells of the alveoli are covered by a layer of water that does what to surface tension -
CORRECT ANSWER - increases
Damage to the lower motor neurons of C3, C4 and C5 (Phrenic nerve) has what effect? -
CORRECT ANSWER - Paralysis of the diaphragm
Elastic recoil of the lungs to their original volume is an active process (true or false) -
CORRECT ANSWER - true
What is the function of the type I pneumocytes? - CORRECT ANSWER - Responsible for
gas exchange that takes place in the alveoli
By decreasing the surface tension, surfactant (detergent): - CORRECT ANSWER -
increases lung compliance & decreases lung elastic recoil
What is the difference between the conducting and respiratory zones? - CORRECT
ANSWER - The conducting zone is the respiratory tract leading up to the alveoli. The
respiratory zone is where the gas exchange happens in the alveoli.
What are the functions of the respiratory system? - CORRECT ANSWER - Gas exchange
with oxygen entering the pulmonary capillaries from the alveoli and carbon dioxide entering the
alveoli from the pulmonary capillaries.
Maintaining blood pH from about 7.2-7.4. This is maintained with a bicarbonate buffering
system CO2 + H2O <—> H2CO3 <—> H+ + HCO3-
Contraction of the respiratory diaphragm causes _____ by ______ intrapleural pressure -
CORRECT ANSWER - inspiration; decreasing
, At higher elevations, the partial pressure of the atmosphere is lower causing the pressure
difference between the alveoli and the atmosphere to be ______. Therefore, gas exchange is
_______. - CORRECT ANSWER - lower; more difficult
Match the following hematopoietic cells with an appropriate definition: - CORRECT
ANSWER - erythrocytes --> bags of hemoglobin
proerythrocytes --> cells that can still make proteins
reticulocytes --> anucleated cells with remnants of ER
megakaryocytes --> cells that break off processes to form platelets
normoblasts --> cells that eject their nucleus
Antigens in the extracellular fluid are carried into the capillaries specialized to carry fluid. This
fluid is monitored by cells in the germinal regions of ___________________. - CORRECT
ANSWER - lymph nodes
Which of the following is a correct statement? - CORRECT ANSWER - Erythrocytes do
NOT have class I MHC or class II MHC & Macrophages have both class I and class II MHC
Match the cell with its role in the immune response. - CORRECT ANSWER - Granulocyte
--> releases toxic substances to ward off pathogens
Macrophage --> phagocytic, professional APC
B-lymphocyte --> part of the humoral branch of the adaptive immune system, secretes antibodies
Questions and CORRECT Answers
Epithelial cells of the alveoli are covered by a layer of water that does what to surface tension -
CORRECT ANSWER - increases
Damage to the lower motor neurons of C3, C4 and C5 (Phrenic nerve) has what effect? -
CORRECT ANSWER - Paralysis of the diaphragm
Elastic recoil of the lungs to their original volume is an active process (true or false) -
CORRECT ANSWER - true
What is the function of the type I pneumocytes? - CORRECT ANSWER - Responsible for
gas exchange that takes place in the alveoli
By decreasing the surface tension, surfactant (detergent): - CORRECT ANSWER -
increases lung compliance & decreases lung elastic recoil
What is the difference between the conducting and respiratory zones? - CORRECT
ANSWER - The conducting zone is the respiratory tract leading up to the alveoli. The
respiratory zone is where the gas exchange happens in the alveoli.
What are the functions of the respiratory system? - CORRECT ANSWER - Gas exchange
with oxygen entering the pulmonary capillaries from the alveoli and carbon dioxide entering the
alveoli from the pulmonary capillaries.
Maintaining blood pH from about 7.2-7.4. This is maintained with a bicarbonate buffering
system CO2 + H2O <—> H2CO3 <—> H+ + HCO3-
Contraction of the respiratory diaphragm causes _____ by ______ intrapleural pressure -
CORRECT ANSWER - inspiration; decreasing
, At higher elevations, the partial pressure of the atmosphere is lower causing the pressure
difference between the alveoli and the atmosphere to be ______. Therefore, gas exchange is
_______. - CORRECT ANSWER - lower; more difficult
Match the following hematopoietic cells with an appropriate definition: - CORRECT
ANSWER - erythrocytes --> bags of hemoglobin
proerythrocytes --> cells that can still make proteins
reticulocytes --> anucleated cells with remnants of ER
megakaryocytes --> cells that break off processes to form platelets
normoblasts --> cells that eject their nucleus
Antigens in the extracellular fluid are carried into the capillaries specialized to carry fluid. This
fluid is monitored by cells in the germinal regions of ___________________. - CORRECT
ANSWER - lymph nodes
Which of the following is a correct statement? - CORRECT ANSWER - Erythrocytes do
NOT have class I MHC or class II MHC & Macrophages have both class I and class II MHC
Match the cell with its role in the immune response. - CORRECT ANSWER - Granulocyte
--> releases toxic substances to ward off pathogens
Macrophage --> phagocytic, professional APC
B-lymphocyte --> part of the humoral branch of the adaptive immune system, secretes antibodies
