BIOD 151 Essential Human Anatomy & Physiology I
Module 8 on The Respiratory System 150 Questions and correct answers
1. Module Overview
Advanced review of upper and lower respiratory structures, pulmonary compliance metrics, surfactant
chemistry, ventilation-perfusion mismatch boundaries, gas transport kinetics, and central/peripheral
chemoreceptor homeostatic loops.
2. High ranking Question Bank (150 Objective Prompts)
Question 1: [1] What specialized lipoprotein complex is secreted by Type II alveolar cells to decrease
surface tension within the lungs?
Correct Answer: Pulmonary surfactant
Physiological Rationale: Surfactant disrupts the cohesive hydrogen bonding of water molecules
lining the alveolar fluid film. This lowers surface tension, prevents alveolar collapse during
expiration, and reduces the overall work of breathing.
Question 2: [2] Which primary respiratory center in the brainstem sets the basic rhythmic pace of
involuntary ventilation?
Correct Answer: Ventral Respiratory Group (VRG) in the medulla oblongata
Physiological Rationale: The VRG contains pacemaker neurons that rhythmically fire impulses to
drive the diaphragm via the phrenic nerve and intercostal muscles via intercostal nerves, dictating
basic eupnea.
Question 3: [3] What law states that the total pressure exerted by a mixture of ideal gases is equal to
the sum of the partial pressures of its individual components?
Correct Answer: Dalton's Law of Partial Pressures
Physiological Rationale: Dalton's Law dictates that each gas in a mixture exerts its own pressure
independently. This underpins the partial pressure gradients (PO2 and PCO2) that drive gas diffusion
across the respiratory membrane.
Question 4: [4] How is the vast majority of metabolic carbon dioxide transported within human systemic
venous blood?
Correct Answer: As bicarbonate ions (HCO3-) dissolved in plasma
Physiological Rationale: Approximately 70% of CO2 is converted inside erythrocytes into carbonic
acid via carbonic anhydrase, which dissociates into hydrogen and bicarbonate ions. The bicarbonate
then shifts into the plasma in exchange for chloride.
,Question 5: [5] What specialized lipoprotein complex is secreted by Type II alveolar cells to decrease
surface tension within the lungs?
Correct Answer: Pulmonary surfactant
Physiological Rationale: Surfactant disrupts the cohesive hydrogen bonding of water molecules
lining the alveolar fluid film. This lowers surface tension, prevents alveolar collapse during
expiration, and reduces the overall work of breathing.
Question 6: [6] Which primary respiratory center in the brainstem sets the basic rhythmic pace of
involuntary ventilation?
Correct Answer: Ventral Respiratory Group (VRG) in the medulla oblongata
Physiological Rationale: The VRG contains pacemaker neurons that rhythmically fire impulses to
drive the diaphragm via the phrenic nerve and intercostal muscles via intercostal nerves, dictating
basic eupnea.
Question 7: [7] What law states that the total pressure exerted by a mixture of ideal gases is equal to
the sum of the partial pressures of its individual components?
Correct Answer: Dalton's Law of Partial Pressures
Physiological Rationale: Dalton's Law dictates that each gas in a mixture exerts its own pressure
independently. This underpins the partial pressure gradients (PO2 and PCO2) that drive gas diffusion
across the respiratory membrane.
Question 8: [8] How is the vast majority of metabolic carbon dioxide transported within human systemic
venous blood?
Correct Answer: As bicarbonate ions (HCO3-) dissolved in plasma
Physiological Rationale: Approximately 70% of CO2 is converted inside erythrocytes into carbonic
acid via carbonic anhydrase, which dissociates into hydrogen and bicarbonate ions. The bicarbonate
then shifts into the plasma in exchange for chloride.
Question 9: [9] What specialized lipoprotein complex is secreted by Type II alveolar cells to decrease
surface tension within the lungs?
Correct Answer: Pulmonary surfactant
Physiological Rationale: Surfactant disrupts the cohesive hydrogen bonding of water molecules
lining the alveolar fluid film. This lowers surface tension, prevents alveolar collapse during
expiration, and reduces the overall work of breathing.
Question 10: [10] Which primary respiratory center in the brainstem sets the basic rhythmic pace of
involuntary ventilation?
Correct Answer: Ventral Respiratory Group (VRG) in the medulla oblongata
Physiological Rationale: The VRG contains pacemaker neurons that rhythmically fire impulses to
drive the diaphragm via the phrenic nerve and intercostal muscles via intercostal nerves, dictating
basic eupnea.
, Question 11: [11] What law states that the total pressure exerted by a mixture of ideal gases is equal to
the sum of the partial pressures of its individual components?
Correct Answer: Dalton's Law of Partial Pressures
Physiological Rationale: Dalton's Law dictates that each gas in a mixture exerts its own pressure
independently. This underpins the partial pressure gradients (PO2 and PCO2) that drive gas diffusion
across the respiratory membrane.
Question 12: [12] How is the vast majority of metabolic carbon dioxide transported within human
systemic venous blood?
Correct Answer: As bicarbonate ions (HCO3-) dissolved in plasma
Physiological Rationale: Approximately 70% of CO2 is converted inside erythrocytes into carbonic
acid via carbonic anhydrase, which dissociates into hydrogen and bicarbonate ions. The bicarbonate
then shifts into the plasma in exchange for chloride.
Question 13: [13] What specialized lipoprotein complex is secreted by Type II alveolar cells to decrease
surface tension within the lungs?
Correct Answer: Pulmonary surfactant
Physiological Rationale: Surfactant disrupts the cohesive hydrogen bonding of water molecules
lining the alveolar fluid film. This lowers surface tension, prevents alveolar collapse during
expiration, and reduces the overall work of breathing.
Question 14: [14] Which primary respiratory center in the brainstem sets the basic rhythmic pace of
involuntary ventilation?
Correct Answer: Ventral Respiratory Group (VRG) in the medulla oblongata
Physiological Rationale: The VRG contains pacemaker neurons that rhythmically fire impulses to
drive the diaphragm via the phrenic nerve and intercostal muscles via intercostal nerves, dictating
basic eupnea.
Question 15: [15] What law states that the total pressure exerted by a mixture of ideal gases is equal to
the sum of the partial pressures of its individual components?
Correct Answer: Dalton's Law of Partial Pressures
Physiological Rationale: Dalton's Law dictates that each gas in a mixture exerts its own pressure
independently. This underpins the partial pressure gradients (PO2 and PCO2) that drive gas diffusion
across the respiratory membrane.
Question 16: [16] How is the vast majority of metabolic carbon dioxide transported within human
systemic venous blood?
Correct Answer: As bicarbonate ions (HCO3-) dissolved in plasma
Physiological Rationale: Approximately 70% of CO2 is converted inside erythrocytes into carbonic
acid via carbonic anhydrase, which dissociates into hydrogen and bicarbonate ions. The bicarbonate
then shifts into the plasma in exchange for chloride.
Module 8 on The Respiratory System 150 Questions and correct answers
1. Module Overview
Advanced review of upper and lower respiratory structures, pulmonary compliance metrics, surfactant
chemistry, ventilation-perfusion mismatch boundaries, gas transport kinetics, and central/peripheral
chemoreceptor homeostatic loops.
2. High ranking Question Bank (150 Objective Prompts)
Question 1: [1] What specialized lipoprotein complex is secreted by Type II alveolar cells to decrease
surface tension within the lungs?
Correct Answer: Pulmonary surfactant
Physiological Rationale: Surfactant disrupts the cohesive hydrogen bonding of water molecules
lining the alveolar fluid film. This lowers surface tension, prevents alveolar collapse during
expiration, and reduces the overall work of breathing.
Question 2: [2] Which primary respiratory center in the brainstem sets the basic rhythmic pace of
involuntary ventilation?
Correct Answer: Ventral Respiratory Group (VRG) in the medulla oblongata
Physiological Rationale: The VRG contains pacemaker neurons that rhythmically fire impulses to
drive the diaphragm via the phrenic nerve and intercostal muscles via intercostal nerves, dictating
basic eupnea.
Question 3: [3] What law states that the total pressure exerted by a mixture of ideal gases is equal to
the sum of the partial pressures of its individual components?
Correct Answer: Dalton's Law of Partial Pressures
Physiological Rationale: Dalton's Law dictates that each gas in a mixture exerts its own pressure
independently. This underpins the partial pressure gradients (PO2 and PCO2) that drive gas diffusion
across the respiratory membrane.
Question 4: [4] How is the vast majority of metabolic carbon dioxide transported within human systemic
venous blood?
Correct Answer: As bicarbonate ions (HCO3-) dissolved in plasma
Physiological Rationale: Approximately 70% of CO2 is converted inside erythrocytes into carbonic
acid via carbonic anhydrase, which dissociates into hydrogen and bicarbonate ions. The bicarbonate
then shifts into the plasma in exchange for chloride.
,Question 5: [5] What specialized lipoprotein complex is secreted by Type II alveolar cells to decrease
surface tension within the lungs?
Correct Answer: Pulmonary surfactant
Physiological Rationale: Surfactant disrupts the cohesive hydrogen bonding of water molecules
lining the alveolar fluid film. This lowers surface tension, prevents alveolar collapse during
expiration, and reduces the overall work of breathing.
Question 6: [6] Which primary respiratory center in the brainstem sets the basic rhythmic pace of
involuntary ventilation?
Correct Answer: Ventral Respiratory Group (VRG) in the medulla oblongata
Physiological Rationale: The VRG contains pacemaker neurons that rhythmically fire impulses to
drive the diaphragm via the phrenic nerve and intercostal muscles via intercostal nerves, dictating
basic eupnea.
Question 7: [7] What law states that the total pressure exerted by a mixture of ideal gases is equal to
the sum of the partial pressures of its individual components?
Correct Answer: Dalton's Law of Partial Pressures
Physiological Rationale: Dalton's Law dictates that each gas in a mixture exerts its own pressure
independently. This underpins the partial pressure gradients (PO2 and PCO2) that drive gas diffusion
across the respiratory membrane.
Question 8: [8] How is the vast majority of metabolic carbon dioxide transported within human systemic
venous blood?
Correct Answer: As bicarbonate ions (HCO3-) dissolved in plasma
Physiological Rationale: Approximately 70% of CO2 is converted inside erythrocytes into carbonic
acid via carbonic anhydrase, which dissociates into hydrogen and bicarbonate ions. The bicarbonate
then shifts into the plasma in exchange for chloride.
Question 9: [9] What specialized lipoprotein complex is secreted by Type II alveolar cells to decrease
surface tension within the lungs?
Correct Answer: Pulmonary surfactant
Physiological Rationale: Surfactant disrupts the cohesive hydrogen bonding of water molecules
lining the alveolar fluid film. This lowers surface tension, prevents alveolar collapse during
expiration, and reduces the overall work of breathing.
Question 10: [10] Which primary respiratory center in the brainstem sets the basic rhythmic pace of
involuntary ventilation?
Correct Answer: Ventral Respiratory Group (VRG) in the medulla oblongata
Physiological Rationale: The VRG contains pacemaker neurons that rhythmically fire impulses to
drive the diaphragm via the phrenic nerve and intercostal muscles via intercostal nerves, dictating
basic eupnea.
, Question 11: [11] What law states that the total pressure exerted by a mixture of ideal gases is equal to
the sum of the partial pressures of its individual components?
Correct Answer: Dalton's Law of Partial Pressures
Physiological Rationale: Dalton's Law dictates that each gas in a mixture exerts its own pressure
independently. This underpins the partial pressure gradients (PO2 and PCO2) that drive gas diffusion
across the respiratory membrane.
Question 12: [12] How is the vast majority of metabolic carbon dioxide transported within human
systemic venous blood?
Correct Answer: As bicarbonate ions (HCO3-) dissolved in plasma
Physiological Rationale: Approximately 70% of CO2 is converted inside erythrocytes into carbonic
acid via carbonic anhydrase, which dissociates into hydrogen and bicarbonate ions. The bicarbonate
then shifts into the plasma in exchange for chloride.
Question 13: [13] What specialized lipoprotein complex is secreted by Type II alveolar cells to decrease
surface tension within the lungs?
Correct Answer: Pulmonary surfactant
Physiological Rationale: Surfactant disrupts the cohesive hydrogen bonding of water molecules
lining the alveolar fluid film. This lowers surface tension, prevents alveolar collapse during
expiration, and reduces the overall work of breathing.
Question 14: [14] Which primary respiratory center in the brainstem sets the basic rhythmic pace of
involuntary ventilation?
Correct Answer: Ventral Respiratory Group (VRG) in the medulla oblongata
Physiological Rationale: The VRG contains pacemaker neurons that rhythmically fire impulses to
drive the diaphragm via the phrenic nerve and intercostal muscles via intercostal nerves, dictating
basic eupnea.
Question 15: [15] What law states that the total pressure exerted by a mixture of ideal gases is equal to
the sum of the partial pressures of its individual components?
Correct Answer: Dalton's Law of Partial Pressures
Physiological Rationale: Dalton's Law dictates that each gas in a mixture exerts its own pressure
independently. This underpins the partial pressure gradients (PO2 and PCO2) that drive gas diffusion
across the respiratory membrane.
Question 16: [16] How is the vast majority of metabolic carbon dioxide transported within human
systemic venous blood?
Correct Answer: As bicarbonate ions (HCO3-) dissolved in plasma
Physiological Rationale: Approximately 70% of CO2 is converted inside erythrocytes into carbonic
acid via carbonic anhydrase, which dissociates into hydrogen and bicarbonate ions. The bicarbonate
then shifts into the plasma in exchange for chloride.
