Repiratory Physiology Flashcards
Internal respiration refer to
Gas exchange between histiocytes and the blood in capillaries
Motivation of pulmonary ventilation is produced from
Constriction and dilation of respiratory muscle
When a(n)______contracts,the chest cavity gets larger and air rushes to your lungs
Diaphragm
Which one is the intrapulmonary pressure equal to atmospheric pressure in respiratory phases
End-expiration and end-inspiration
When the respiratory muscles are relaxed,the lungs are at
Functional residual capacity (FRC)
Which of the following can produce the intrathoracic pressure
Atmosphere pressure-pulmonary recoil pressure
How does the intrathoracic pressure change when the diaphragm contracts in the inspiration
More negative
Role of surfactant is
To reduce the surface tension
To keep the alveoli of different size stable in lungs
To keep the alveoli dry
To increase the pulmonary compliance
Which one is not true in the following on function of pulmonary surfactant
To decrease pulmonary compliance
Which one is not true in the following on descriptions of pulmonary surfactant
To decrease pulmonary compliance
A deficiency of pulmonary surfactant would
Decrease lung compliance
A woman has a tidal volume of 350ml,a dead space of 100ml,and a respiratory rate of 18.What is her alveolar ventilation
4.5L
The difference between minute ventilation volume and alveolar ventilation is
Dead space volume *respiratoy frequency
If the tidal voume decreases by half,but respiratoy frequency increases to double,then
Alveolar ventilation is decreased
Which one of the following is higher at apex of the lung than at the base when a person is standing
Va/Q ratio
The key factor of the gas exchange in normal human body is
Difference of the gas partial pressure between both sides of the exchange place
Which one of the following would increase in obstructive,but not in restrictive,lung diseases
Functional residual capacity
Which one of the following will decrease in a person with ventilation/perfusion (Va/Q)abnormalities
Arterial carbon dioxide tension
A 43-year-old man whose pulmonary ventilation is 7500ml/min,the respiratory frequency is 20/min, the dead space is 125 ml, and the minute cardiac output is 5000ml presents to your clinic.What is his ventilation/perfusion
1.0
In areas of the lung with lower than normal Va/Q ratios,the
Pulmonary vascular resistance is higher than normal
A patient with reduced vital capacity (VC),functional residual capacity (FRC), and residual volume (RV) is found to have a normal pH.A tentative diagnosis of diffuse interstitial fibrosis is made.Which of the following characteristics are consistent with this disease
An increase in the forced expiratory volume in 1second/forced vital capacity (FEV1/FVC)ratio
Which one of the following components of a pulmonary function test will be closest to normal in a patient with restrictive lung disease
MVV (maximal voluntary ventilation)
Peripheral and central chemoreceptors may both contribute to the increased ventilation that occurs as a result of
An increase in arterial carbon dioxide tension
The oxygen content of the blood is
The amount of O2 bound to hemoglobin
Oxygen saturation (SO2)equals
O2 content/O2 capacity *100%
The percentage of hemoglobin saturated with oxygen will increase if
The arterial PO2 is increased
The hemoglobin saturated with oxygen of the arterial blood for a normal person is
97%
The affinity of hemoglobin for oxygen is increased by
Carbon monoxide poisoning
An increase in the P50 of an oxyhemoglobin curve would result from a decrease in
pH
The bulk of CO2 is transported in arterial blood as
Bicarbonate
Breathing is an involuntary action under the control of the
Medulla oblongata
The activity of the central chemoreceptor is stimulated by
An increase in the PCO2 of blood flowing through the brain
Hyperventilation in response to a stressful situation leads to
A decrease in the blood flow to the brain
Effect of lower PO2 on respiratory movement is mainly to stimulate
Carotid body
Reduction of functional hemoglobin associated with anemia,metheglobinemia or carbon monoxide poisoning does not produce hypernea because the
PO2 of arterial blood is normal
