Final Exam Prep Flashcards

1
Q

Which of the following structures is not directly involved in the gas exchange process within the lungs?

  • A. Bronchi
  • B. Nostrils
  • C. Alveoli
  • D. Bronchioles
A

Which of the following structures is not directly involved in the gas exchange process within the lungs?

  • A. Bronchi
  • B. Nostrils
  • C. Alveoli
  • D. Bronchioles
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2
Q

The primary muscle responsible for initiating inspiration by increasing the volume of the intrathoracic cavity is:

  • A. Pectoralis minor
  • B. Sternocleidomastoid
  • C. Diaphragm
  • D. External intercostals
A

The primary muscle responsible for initiating inspiration by increasing the volume of the intrathoracic cavity is:

  • A. Pectoralis minor
  • B. Sternocleidomastoid
  • C. Diaphragm
  • D. External intercostals
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3
Q

In terms of lung volumes and capacities, which parameter increases significantly during vigorous exercise?

  • A. Residual volume
  • B. Inspiratory reserve volume
  • C. Tidal volume
  • D. Functional residual capacity
A

In terms of lung volumes and capacities, which parameter increases significantly during vigorous exercise?

  • A. Residual volume
  • B. Inspiratory reserve volume
  • C. Tidal volume
  • D. Functional residual capacity
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4
Q

The formula 𝑉𝐸 = 𝑉𝑇 Γ— 𝑓defines which of the following respiratory measurements?

  • A. Lung compliance
  • B. Airway resistance
  • C. Pulmonary ventilation
  • D. Respiratory quotient
A

The formula 𝑉𝐸 = 𝑉𝑇 Γ— 𝑓defines which of the following respiratory measurements?

  • A. Lung compliance
  • B. Airway resistance
  • C. Pulmonary ventilation
  • D. Respiratory quotient
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5
Q

Pulmonary ventilation involves all of the following functions except:

  • A. Air is warmed as it enters the respiratory tract
  • B. Mucus traps airborne particles
  • C. Air is cooled before reaching the lungs
  • D. Humidifies air to prevent damage to membranes
A

Pulmonary ventilation involves all of the following functions except:

  • A. Air is warmed as it enters the respiratory tract
  • B. Mucus traps airborne particles
  • C. Air is cooled before reaching the lungs
  • D. Humidifies air to prevent damage to membranes
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6
Q

Which of the following is not a factor promoting diffusion of gases in the lungs?

  • A. Large surface area of alveoli
  • B. Pressure differences between air and blood
  • C. Increased airway resistance
  • D. Thinness of the respiratory membrane
A

Which of the following is not a factor promoting diffusion of gases in the lungs?

  • A. Large surface area of alveoli
  • B. Pressure differences between air and blood
  • C. Increased airway resistance
  • D. Thinness of the respiratory membrane
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7
Q

The intrapleural pressure is described as being:

  • A. Less than atmospheric pressure
  • B. Equal to intrapulmonary pressure during inspiration
  • C. Higher than intrapulmonary pressure at rest
  • D. None of the above
A

The intrapleural pressure is described as being:

  • A. Less than atmospheric pressure
  • B. Equal to intrapulmonary pressure during inspiration
  • C. Higher than intrapulmonary pressure at rest
  • D. None of the above
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8
Q

Expiration at rest is primarily a result of:

  • A. Passive recoil of the diaphragm
  • B. Contraction of the rectus abdominis
  • C. Active contraction of internal intercostal muscles
  • D. Increased intrathoracic volume
A

Expiration at rest is primarily a result of:

  • A. Passive recoil of the diaphragm
  • B. Contraction of the rectus abdominis
  • C. Active contraction of internal intercostal muscles
  • D. Increased intrathoracic volume
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9
Q

During forced expiration, such as during intense exercise, which muscles are most likely to be involved?

  • A. External intercostals
  • B. Scalenes
  • C. Rectus abdominis
  • D. Diaphragm
A

During forced expiration, such as during intense exercise, which muscles are most likely to be involved?

  • A. External intercostals
  • B. Scalenes
  • C. Rectus abdominis
  • D. Diaphragm
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10
Q

The FEV1-to-FVC ratio decreases in conditions like asthma or emphysema due to:

  • A. Increased tidal volume
  • B. Decreased residual volume
  • C. Airway obstruction limiting expiratory flow
  • D. Increased inspiratory reserve volume
A

The FEV1-to-FVC ratio decreases in conditions like asthma or emphysema due to:

  • A. Increased tidal volume
  • B. Decreased residual volume
  • C. Airway obstruction limiting expiratory flow
  • D. Increased inspiratory reserve volume
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11
Q

What is the primary function of the respiratory membrane in the alveoli?

  • A. To produce mucus
  • B. To facilitate the diffusion of gases
  • C. To regulate airflow resistance
  • D. To warm the air entering the lungs
A

What is the primary function of the respiratory membrane in the alveoli?

  • A. To produce mucus
  • B. To facilitate the diffusion of gases
  • C. To regulate airflow resistance
  • D. To warm the air entering the lungs
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12
Q

Which muscles are primarily responsible for elevating the ribs during the process of inspiration?

  • A. External intercostals
  • B. Internal intercostals
  • C. Pectoralis major
  • D. Latissimus dorsi
A

Which muscles are primarily responsible for elevating the ribs during the process of inspiration?

  • A. External intercostals
  • B. Internal intercostals
  • C. Pectoralis major
  • D. Latissimus dorsi
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13
Q

The partial pressure of carbon dioxide (PCO2) in the alveoli is typically:

  • A. 0.2 mm Hg
  • B. 40 mm Hg
  • C. 46 mm Hg
  • D. 100 mm Hg
A

The partial pressure of carbon dioxide (PCO2) in the alveoli is typically:

  • A. 0.2 mm Hg
  • B. 40 mm Hg
  • C. 46 mm Hg
  • D. 100 mm Hg
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14
Q

Which physiological change is associated with an increase in age with respect to lung volumes and capacities?

  • A. Increase in tidal volume
  • B. Increase in total lung capacity
  • C. Increase in residual volume
  • D. Increase in inspiratory capacity
A

Which physiological change is associated with an increase in age with respect to lung volumes and capacities?

  • A. Increase in tidal volume
  • B. Increase in total lung capacity
  • C. Increase in residual volume
  • D. Increase in inspiratory capacity
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15
Q

When considering the transportation of carbon dioxide in the blood, what percentage is transported as bicarbonate?

  • A. 10%
  • B. 20%
  • C. 70%
  • D. 90%
A

When considering the transportation of carbon dioxide in the blood, what percentage is transported as bicarbonate?

  • A. 10%
  • B. 20%
  • C. 70%
  • D. 90%
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16
Q

Myoglobin, found in skeletal and cardiac muscle, serves which primary function during physical activity?

  • A. Transports carbon dioxide from tissues to lungs
  • B. Binds oxygen to facilitate its transport to mitochondria
  • C. Acts as a primary source of energy
  • D. Converts glucose to ATP
A

Myoglobin, found in skeletal and cardiac muscle, serves which primary function during physical activity?

  • A. Transports carbon dioxide from tissues to lungs
  • B. Binds oxygen to facilitate its transport to mitochondria
  • C. Acts as a primary source of energy
  • D. Converts glucose to ATP
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17
Q

Which of the following best describes the role of central chemoreceptors in respiratory control?

  • A. They detect changes in oxygen levels in the blood.
  • B. They respond to changes in pH and H+ concentration in cerebrospinal fluid.
  • C. They control the voluntary modification of breathing patterns.
  • D. They increase the respiratory rate in response to decreases in blood pressure.
A

Which of the following best describes the role of central chemoreceptors in respiratory control?

  • A. They detect changes in oxygen levels in the blood.
  • B. They respond to changes in pH and H+ concentration in cerebrospinal fluid.
  • C. They control the voluntary modification of breathing patterns.
  • D. They increase the respiratory rate in response to decreases in blood pressure.
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18
Q

What is the primary role of pleural fluid in the respiratory system?

  • A. To provide nutrients to lung tissues
  • B. To facilitate gas exchange between alveoli and blood
  • C. To reduce friction between the pleural membranes during breathing
  • D. To transport oxygen and carbon dioxide between the lungs and the heart
A

What is the primary role of pleural fluid in the respiratory system?

  • A. To provide nutrients to lung tissues
  • B. To facilitate gas exchange between alveoli and blood
  • C. To reduce friction between the pleural membranes during breathing
  • D. To transport oxygen and carbon dioxide between the lungs and the heart
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19
Q

During an intense workout, how does the respiratory system primarily respond to meet increased oxygen demands?

  • A. By increasing both the depth and frequency of breathing
  • B. By decreasing the tidal volume to conserve energy
  • C. By increasing the residual volume
  • D. By decreasing the rate of breathing to enhance gas exchange
A

During an intense workout, how does the respiratory system primarily respond to meet increased oxygen demands?

  • A. By increasing both the depth and frequency of breathing
  • B. By decreasing the tidal volume to conserve energy
  • C. By increasing the residual volume
  • D. By decreasing the rate of breathing to enhance gas exchange
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20
Q

How does the thickness of the respiratory membrane affect the efficiency of gas exchange in the lungs?

  • A. Increased thickness enhances oxygen absorption
  • B. Decreased thickness facilitates faster diffusion of gases
  • C. Increased thickness decreases the diffusion capacity for carbon dioxide
  • D. Decreased thickness increases airflow resistance
A

How does the thickness of the respiratory membrane affect the efficiency of gas exchange in the lungs?

  • A. Increased thickness enhances oxygen absorption
  • B. Decreased thickness facilitates faster diffusion of gases
  • C. Increased thickness decreases the diffusion capacity for carbon dioxide
  • D. Decreased thickness increases airflow resistance
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21
Q

Which of the following best describes the effect of exercise on bronchial diameter?

  • A. Exercise decreases bronchial diameter due to increased airway resistance.
  • B. Exercise causes bronchodilation, decreasing resistance to airflow.
  • C. Exercise has no effect on bronchial diameter.
  • D. Exercise increases bronchial constriction, enhancing oxygen uptake.
A

Which of the following best describes the effect of exercise on bronchial diameter?

  • A. Exercise decreases bronchial diameter due to increased airway resistance.
  • B. Exercise causes bronchodilation, decreasing resistance to airflow.
  • C. Exercise has no effect on bronchial diameter.
  • D. Exercise increases bronchial constriction, enhancing oxygen uptake.
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22
Q

During pulmonary gas exchange, the movement of oxygen from alveoli into the blood is primarily facilitated by:

  • A. Active transport mechanisms
  • B. The gradient of partial pressure differences
  • C. The hydrostatic pressure in the capillaries
  • D. The viscosity of the blood
A

During pulmonary gas exchange, the movement of oxygen from alveoli into the blood is primarily facilitated by:

  • A. Active transport mechanisms
  • B. The gradient of partial pressure differences
  • C. The hydrostatic pressure in the capillaries
  • D. The viscosity of the blood
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23
Q

Ventilation during moderate to intense exercise is most effectively controlled by:

  • A. Voluntary efforts from the cerebral cortex
  • B. Chemoreceptors that respond to blood pH and gas levels
  • C. Central nervous system suppression of respiratory muscles
  • D. Decreased sensitivity of the respiratory centers to carbon dioxide
A

Ventilation during moderate to intense exercise is most effectively controlled by:

  • A. Voluntary efforts from the cerebral cortex
  • B. Chemoreceptors that respond to blood pH and gas levels
  • C. Central nervous system suppression of respiratory muscles
  • D. Decreased sensitivity of the respiratory centers to carbon dioxide
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24
Q

What is the role of hemoglobin in oxygen transport?

  • A. Hemoglobin decreases the solubility of oxygen in blood.
  • B. Hemoglobin binds with carbon dioxide to expel it from the body.
  • C. Hemoglobin carries most of the oxygen transported in the blood.
  • D. Hemoglobin prevents oxygen from escaping from the capillaries.
A

What is the role of hemoglobin in oxygen transport?

  • A. Hemoglobin decreases the solubility of oxygen in blood.
  • B. Hemoglobin binds with carbon dioxide to expel it from the body.
  • C. Hemoglobin carries most of the oxygen transported in the blood.
  • D. Hemoglobin prevents oxygen from escaping from the capillaries
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25
Q

Which condition would result in a FEV1/FVC ratio below the normal range of 75-85%?

  • A. Decreased age-related elastic decline
  • B. Heightened respiratory muscle function
  • C. Increased airway resistance due to structural lung changes
  • D. Obstructive lung disease, such as asthma or emphysema
A

Which condition would result in a FEV1/FVC ratio below the normal range of 75-85%?

  • A. Decreased age-related elastic decline
  • B. Heightened respiratory muscle function
  • C. Increased airway resistance due to structural lung changes
  • D. Obstructive lung disease, such as asthma or emphysema
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26
Q

The respiratory control center in the medulla oblongata primarily:

  • A. Initiates voluntary muscular contractions for respiration.
  • B. Generates the basic rhythmical pattern of breathing.
  • C. Modulates the respiratory rate based on visual stimuli.
  • D. Acts independently of peripheral chemoreceptors.
A

The respiratory control center in the medulla oblongata primarily:

  • A. Initiates voluntary muscular contractions for respiration.
  • B. Generates the basic rhythmical pattern of breathing.
  • C. Modulates the respiratory rate based on visual stimuli.
  • D. Acts independently of peripheral chemoreceptors.
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27
Q

What is the primary purpose of the pulmonary pleurae?

  • A. To absorb oxygen from the alveolar air
  • B. To encase each lung in a protective double-layered membrane
  • C. To increase the surface area for gas exchange
  • D. To actively transport gases into and out of the lungs
A

What is the primary purpose of the pulmonary pleurae?

  • A. To absorb oxygen from the alveolar air
  • B. To encase each lung in a protective double-layered membrane
  • C. To increase the surface area for gas exchange
  • D. To actively transport gases into and out of the lungs
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28
Q

How does the diaphragm contribute to the mechanics of ventilation?

  • A. It contracts and flattens, increasing the volume of the thoracic cavity during inspiration.
  • B. It relaxes and curves upwards, decreasing the thoracic volume during inspiration.
  • C. It remains static and allows the intercostal muscles to control breathing.
  • D. It assists in expelling air during forced expiration only.
A

How does the diaphragm contribute to the mechanics of ventilation?

  • A. It contracts and flattens, increasing the volume of the thoracic cavity during inspiration.
  • B. It relaxes and curves upwards, decreasing the thoracic volume during inspiration.
  • C. It remains static and allows the intercostal muscles to control breathing.
  • D. It assists in expelling air during forced expiration only.
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29
Q

In cases of severe asthma, which muscle group is particularly involved during forced expiration?

  • A. Internal intercostals and abdominal muscles
  • B. External intercostals and pectoralis major
  • C. Diaphragm and scalenes
  • D. Sternocleidomastoid and trapezius
A

In cases of severe asthma, which muscle group is particularly involved during forced expiration?

  • A. Internal intercostals and abdominal muscles
  • B. External intercostals and pectoralis major
  • C. Diaphragm and scalenes
  • D. Sternocleidomastoid and trapezius
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30
Q

What effect does aging have on the respiratory system’s lung volumes?

  • A. Increase in both tidal and residual volumes
  • B. Increase in residual volume with a decrease in expiratory reserve volume
  • C. General increase in all lung volumes and capacities
  • D. Decrease in residual volume with an increase in inspiratory capacity
A

What effect does aging have on the respiratory system’s lung volumes?

  • A. Increase in both tidal and residual volumes
  • B. Increase in residual volume with a decrease in expiratory reserve volume
  • C. General increase in all lung volumes and capacities
  • D. Decrease in residual volume with an increase in inspiratory capacity
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31
Q

Which of the following best describes the effect of exercise on bronchial diameter?

  • A. Exercise decreases bronchial diameter due to increased airway resistance.
  • B. Exercise causes bronchodilation, decreasing resistance to airflow.
  • C. Exercise has no effect on bronchial diameter.
  • D. Exercise increases bronchial constriction, enhancing oxygen uptake.
A

Which of the following best describes the effect of exercise on bronchial diameter?

  • A. Exercise decreases bronchial diameter due to increased airway resistance.
  • B. Exercise causes bronchodilation, decreasing resistance to airflow.
  • C. Exercise has no effect on bronchial diameter.
  • D. Exercise increases bronchial constriction, enhancing oxygen uptake.
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32
Q

During pulmonary gas exchange, the movement of oxygen from alveoli into the blood is primarily facilitated by:

  • A. Active transport mechanisms
  • B. The gradient of partial pressure differences
  • C. The hydrostatic pressure in the capillaries
  • D. The viscosity of the blood
A

During pulmonary gas exchange, the movement of oxygen from alveoli into the blood is primarily facilitated by:

  • A. Active transport mechanisms
  • B. The gradient of partial pressure differences
  • C. The hydrostatic pressure in the capillaries
  • D. The viscosity of the blood
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33
Q

What is the role of cilia in the respiratory system?

  • A. To increase the diffusion of gases at the alveoli.
  • B. To move mucus toward the oral cavity to be expelled.
  • C. To regulate the flow of serous fluid in the pleural cavity.
  • D. To control the opening and closing of the airway during respiration.
A

What is the role of cilia in the respiratory system?

  • A. To increase the diffusion of gases at the alveoli.
  • B. To move mucus toward the oral cavity to be expelled.
  • C. To regulate the flow of serous fluid in the pleural cavity.
  • D. To control the opening and closing of the airway during respiration.
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34
Q

What happens to the intrapleural pressure during inspiration?

  • A. It becomes more negative relative to atmospheric pressure, facilitating lung expansion.
  • B. It increases to higher than atmospheric pressure, pushing air out of the lungs.
  • C. It equilibrates with the intrapulmonary pressure.
  • D. It drops to zero, causing the lungs to collapse.
A

What happens to the intrapleural pressure during inspiration?

  • A. It becomes more negative relative to atmospheric pressure, facilitating lung expansion.
  • B. It increases to higher than atmospheric pressure, pushing air out of the lungs.
  • C. It equilibrates with the intrapulmonary pressure.
  • D. It drops to zero, causing the lungs to collapse.
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35
Q

What is the primary effect of bronchodilation during exercise?

  • A. It decreases the amount of air that can be inspired.
  • B. It increases the resistance to airflow.
  • C. It increases airflow by decreasing resistance.
  • D. It leads to a decrease in pulmonary ventilation.
A

What is the primary effect of bronchodilation during exercise?

  • A. It decreases the amount of air that can be inspired.
  • B. It increases the resistance to airflow.
  • C. It increases airflow by decreasing resistance.
  • D. It leads to a decrease in pulmonary ventilation.
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36
Q

How does the partial pressure of oxygen in the alveoli compare to that in arterial blood?

  • A. It is lower in the alveoli than in arterial blood.
  • B. It is higher in the alveoli, facilitating diffusion into the blood.
  • C. It is the same, indicating no net movement of oxygen.
  • D. It fluctuates more in the alveoli than in the blood.
A

How does the partial pressure of oxygen in the alveoli compare to that in arterial blood?

  • A. It is lower in the alveoli than in arterial blood.
  • B. It is higher in the alveoli, facilitating diffusion into the blood.
  • C. It is the same, indicating no net movement of oxygen.
  • D. It fluctuates more in the alveoli than in the blood.
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37
Q

Which condition directly results from a failure in the gas exchange efficiency at the alveoli?

  • A. Increased blood pressure
  • B. Hypoxemia
  • C. Hypercapnia
  • D. Acidosis
A

Which condition directly results from a failure in the gas exchange efficiency at the alveoli?

  • A. Increased blood pressure
  • B. Hypoxemia
  • C. Hypercapnia
  • D. Acidosis
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38
Q

What role does the parietal pleura play in the respiratory system?

  • A. It lines the inner surface of the thoracic cavity and diaphragm.
  • B. It directly covers the lungs.
  • C. It secretes enzymes that aid in gas exchange.
  • D. It absorbs oxygen into the bloodstream.
A

What role does the parietal pleura play in the respiratory system?

  • A. It lines the inner surface of the thoracic cavity and diaphragm.
  • B. It directly covers the lungs.
  • C. It secretes enzymes that aid in gas exchange.
  • D. It absorbs oxygen into the bloodstream.
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39
Q

What is the primary role of the serous fluid found between the pleural membranes?

  • A. It acts as a lubricant to facilitate the movement of lungs during breathing.
  • B. It aids in the transport of gases across the pleural membranes.
  • C. It provides nutrients to the cells of the pleural membranes.
  • D. It serves as a buffer to regulate pH changes in the pleural cavity.
A

What is the primary role of the serous fluid found between the pleural membranes?

  • A. It acts as a lubricant to facilitate the movement of lungs during breathing.
  • B. It aids in the transport of gases across the pleural membranes.
  • C. It provides nutrients to the cells of the pleural membranes.
  • D. It serves as a buffer to regulate pH changes in the pleural cavity.
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40
Q

All of the following are functions of the respiratory system except:

  • A. Exchange of gases between air and blood.
  • B. Regulation of blood pH.
  • C. Synthesis of red blood cells.
  • D. Humidification of inhaled air.
A

All of the following are functions of the respiratory system except:

  • A. Exchange of gases between air and blood.
  • B. Regulation of blood pH.
  • C. Synthesis of red blood cells.
  • D. Humidification of inhaled air.
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41
Q

All of the following are structural features that increase the efficiency of gas exchange in the alveoli except:

  • A. High surface area provided by numerous alveoli.
  • B. Proximity of alveoli to capillaries.
  • C. Thick mucus layer covering alveoli.
  • D. Thin respiratory membrane.
A

All of the following are structural features that increase the efficiency of gas exchange in the alveoli except:

  • A. High surface area provided by numerous alveoli.
  • B. Proximity of alveoli to capillaries.
  • C. Thick mucus layer covering alveoli.
  • D. Thin respiratory membrane.
42
Q

During the respiratory process, all of the following decrease during inspiration except:

  • A. Intrapulmonic pressure.
  • B. Pleural fluid volume.
  • C. Volume of the thoracic cavity.
  • D. Air pressure within the alveoli.
A

During the respiratory process, all of the following decrease during inspiration except:

  • A. Intrapulmonic pressure.
  • B. Pleural fluid volume.
  • C. Volume of the thoracic cavity.
  • D. Air pressure within the alveoli.
43
Q

All of the following are effects of aging on the respiratory system except:

  • A. Decrease in the elasticity of lung tissues.
  • B. Increase in residual volume.
  • C. Enhancement in the efficiency of the gas exchange process.
  • D. Reduction in maximum voluntary ventilation.
A

All of the following are effects of aging on the respiratory system except:

  • A. Decrease in the elasticity of lung tissues.
  • B. Increase in residual volume.
  • C. Enhancement in the efficiency of the gas exchange process.
  • D. Reduction in maximum voluntary ventilation.
44
Q

In the control of ventilation, all of the following are influenced by chemoreceptors except:

  • A. Response to changes in arterial carbon dioxide levels.
  • B. Regulation of blood glucose levels.
  • C. Sensitivity to changes in blood pH.
  • D. Adjustments in respiratory rate.
A

In the control of ventilation, all of the following are influenced by chemoreceptors except:

  • A. Response to changes in arterial carbon dioxide levels.
  • B. Regulation of blood glucose levels.
  • C. Sensitivity to changes in blood pH.
  • D. Adjustments in respiratory rate.
45
Q

All of the following muscles are involved in forced expiration except:

  • A. Internal intercostals.
  • B. Rectus abdominis.
  • C. Diaphragm.
  • D. Internal oblique muscles of the abdominal wall.
A

All of the following muscles are involved in forced expiration except:

  • A. Internal intercostals.
  • B. Rectus abdominis.
  • C. Diaphragm.
  • D. Internal oblique muscles of the abdominal wall.
46
Q

All of the following statements about myoglobin are true except:

  • A. It binds oxygen more readily than hemoglobin.
  • B. It is found in skeletal and cardiac muscle.
  • C. It is the primary transporter of CO2 in muscle cells.
  • D. It assists in the passive diffusion of oxygen within muscle cells.
A

All of the following statements about myoglobin are true except:

  • A. It binds oxygen more readily than hemoglobin.
  • B. It is found in skeletal and cardiac muscle.
  • C. It is the primary transporter of CO2 in muscle cells.
  • D. It assists in the passive diffusion of oxygen within muscle cells.
47
Q

All of the following conditions can lead to a decreased FEV1/FVC ratio except:

  • A. Asthma.
  • B. Emphysema.
  • C. Increased inspiratory muscle strength.
  • D. Chronic bronchitis.
A

All of the following conditions can lead to a decreased FEV1/FVC ratio except:

  • A. Asthma.
  • B. Emphysema.
  • C. Increased inspiratory muscle strength.
  • D. Chronic bronchitis.
48
Q

All of the following are roles of the pleurae in the respiratory system except:

  • A. Reducing friction between the lungs and chest wall.
  • B. Encasing each lung in a protective double-layered membrane.
  • C. Directly facilitating the oxygen-carbon dioxide exchange.
  • D. Containing pleural fluid to assist in lung expansion and contraction.
A

All of the following are roles of the pleurae in the respiratory system except:

  • A. Reducing friction between the lungs and chest wall.
  • B. Encasing each lung in a protective double-layered membrane.
  • C. Directly facilitating the oxygen-carbon dioxide exchange.
  • D. Containing pleural fluid to assist in lung expansion and contraction.
49
Q

During physical exercise, all of the following occur in the respiratory system except:

  • A. Increase in breathing rate.
  • B. Increase in tidal volume.
  • C. Decrease in oxygen extraction from the blood.
  • D. Bronchodilation to decrease airway resistance.
A

During physical exercise, all of the following occur in the respiratory system except:

  • A. Increase in breathing rate.
  • B. Increase in tidal volume.
  • C. Decrease in oxygen extraction from the blood.
  • D. Bronchodilation to decrease airway resistance.
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