Repiratory Physiology

Question 1

Internal respiration refer to

Answer 1

Gas exchange between histiocytes and the blood in capillaries

Question 2

Motivation of pulmonary ventilation is produced from

Answer 2

Constriction and dilation of respiratory muscle

Question 3

When a(n)______contracts,the chest cavity gets larger and air rushes to your lungs

Answer 3

Diaphragm

Question 4

Which one is the intrapulmonary pressure equal to atmospheric pressure in respiratory phases

Answer 4

End-expiration and end-inspiration

Question 5

When the respiratory muscles are relaxed,the lungs are at

Answer 5

Functional residual capacity (FRC)

Question 6

Which of the following can produce the intrathoracic pressure

Answer 6

Atmosphere pressure-pulmonary recoil pressure

Question 7

How does the intrathoracic pressure change when the diaphragm contracts in the inspiration

Answer 7

More negative

Question 8

Role of surfactant is

Answer 8

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

Question 9

Which one is not true in the following on function of pulmonary surfactant

Answer 9

To decrease pulmonary compliance

Question 10

Which one is not true in the following on descriptions of pulmonary surfactant

Answer 10

To decrease pulmonary compliance

Question 11

A deficiency of pulmonary surfactant would

Answer 11

Decrease lung compliance

Question 12

A woman has a tidal volume of 350ml,a dead space of 100ml,and a respiratory rate of 18.What is her alveolar ventilation

Answer 12

4.5L

Question 13

The difference between minute ventilation volume and alveolar ventilation is

Answer 13

Dead space volume *respiratoy frequency

Question 14

If the tidal voume decreases by half,but respiratoy frequency increases to double,then

Answer 14

Alveolar ventilation is decreased

Question 15

Which one of the following is higher at apex of the lung than at the base when a person is standing

Answer 15

Va/Q ratio

Question 16

The key factor of the gas exchange in normal human body is

Answer 16

Difference of the gas partial pressure between both sides of the exchange place

Question 17

Which one of the following would increase in obstructive,but not in restrictive,lung diseases

Answer 17

Functional residual capacity

Question 18

Which one of the following will decrease in a person with ventilation/perfusion (Va/Q)abnormalities

Answer 18

Arterial carbon dioxide tension

Question 19

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

Answer 19

1.0

Question 20

In areas of the lung with lower than normal Va/Q ratios,the

Answer 20

Pulmonary vascular resistance is higher than normal

Question 21

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

Answer 21

An increase in the forced expiratory volume in 1second/forced vital capacity (FEV1/FVC)ratio

Question 22

Which one of the following components of a pulmonary function test will be closest to normal in a patient with restrictive lung disease

Answer 22

MVV (maximal voluntary ventilation)

Question 23

Peripheral and central chemoreceptors may both contribute to the increased ventilation that occurs as a result of

Answer 23

An increase in arterial carbon dioxide tension

Question 24

The oxygen content of the blood is

Answer 24

The amount of O2 bound to hemoglobin

Question 25

Oxygen saturation (SO2)equals

Answer 25

O2 content/O2 capacity *100%

Question 26

The percentage of hemoglobin saturated with oxygen will increase if

Answer 26

The arterial PO2 is increased

Question 27

The hemoglobin saturated with oxygen of the arterial blood for a normal person is

Answer 27

97%

Question 28

The affinity of hemoglobin for oxygen is increased by

Answer 28

Carbon monoxide poisoning

Question 29

An increase in the P50 of an oxyhemoglobin curve would result from a decrease in

Answer 29

pH

Question 30

The bulk of CO2 is transported in arterial blood as

Answer 30

Bicarbonate

Question 31

Breathing is an involuntary action under the control of the

Answer 31

Medulla oblongata

Question 32

The activity of the central chemoreceptor is stimulated by

Answer 32

An increase in the PCO2 of blood flowing through the brain

Question 33

Hyperventilation in response to a stressful situation leads to

Answer 33

A decrease in the blood flow to the brain

Question 34

Effect of lower PO2 on respiratory movement is mainly to stimulate

Answer 34

Carotid body

Question 35

Reduction of functional hemoglobin associated with anemia,metheglobinemia or carbon monoxide poisoning does not produce hypernea because the

Answer 35

PO2 of arterial blood is normal