PhysioLec: Gas Exchange

Question 1

TRUE OR FALSE: Internal respiration involves gas exchange in systemic capillaries and tissue level.

Answer 1

False

Question 2

TRUE OR FALSE: The diameter of the pulmonary capillary affects airway resistance.

Answer 2

False

Question 3

TRUE OR FALSE: Increased airway resistance, increases airflow to the distal alveoli.

Answer 3

False

Question 4

TRUE OR FALSE: Bronchioles have a greater tendency to collapse during expiration.

Answer 4

True

Question 5

TRUE OR FALSE: Epinephrine produces bronchodilation

Answer 5

True

Question 6

TRUE OR FALSE: ACh produces bronchoconstriction

Answer 6

True

Question 7

TRUE OR FALSE: The stretchability of the alveoli contributes to lung compliance

Answer 7

True

Question 8

TRUE OR FALSE: A very compliant lung optimizes gas exchange.

Answer 8

False

Question 9

TRUE OR FALSE: A lung with low compliance is a highly collapsible lung

Answer 9

True

Question 10

TRUE OR FALSE: Dalton ’s Law is all about the solubility of gases.

Answer 10

False

Question 11

TRUE OR FALSE: O2 has the most abundant gas percentage in ambient air.

Answer 11

False

Question 12

TRUE OR FALSE: At high altitude, atmospheric pressure decreases but the percentage of gas composition in the air does not change.

Answer 12

True

Question 13

TRUE OR FALSE: At high altitude, N2 predominates as the gas having a high partial pressure, followed by O2.

Answer 13

True

Question 14

TRUE OR FALSE: CO2 is more soluble in liquid than O2

Answer 14

True

Question 15

TRUE OR FALSE: Alveolar air has a lower PO2 than atmospheric air

Answer 15

True

Question 16

TRUE OR FALSE: Atmospheric air has a higher PH2O than alveolar air

Answer 16

False

Atmospheric PH2O: 3.5 mmHg
Alveolar PH2O: 47 mmHg

Question 17

TRUE OR FALSE: In the pulmonary veins, PO2 reaches 104 mmHg

Answer 17

True

Question 18

TRUE OR FALSE: It takes about 1/3 of a second of transit time before the blood becomes O2 saturated

Answer 18

True

Question 19

TRUE OR FALSE: If VA/Q = 0, there is ventilation but no perfusion

Answer 19

False

VA/Q=0: Once it passes the alveolus there is no ventilation, what enters will go out but it is not oxygenated

Question 20

TRUE OR FALSE: In zone 2, during systole there is perfusion, in diastole there is no perfusion.

Answer 20

True

Question 21

TRUE OR FALSE: Zone 1 doesn’t exist in (N) lungs

Answer 21

True

Question 22

TRUE OR FALSE: If VA/Q = N, alveolar PCO2 is 45 mmHg

Answer 22

False

PCO2 = 40 mmHg

Question 23

TRUE OR FALSE: In supine position, Zone 1 is present.

Answer 23

False

Question 24

TRUE OR FALSE: Tissue PO2 is 40 mmHg. The PO2 on the pulmonary end is 40 mmHg and on the arterial end is 104 mmHg.

Answer 24

True

Question 25

TRUE OR FALSE: Venous blood (pulmonary end) has a PCO2 of 45 mmHg and arterial end has a PCO2 of 40 mmHg.

Answer 25

True

Question 26

TRUE OR FALSE: Internal respiration occurs at the tissue-capillary interphase.

Answer 26

False

Question 27

TRUE OR FALSE: The partial pressure of the gases are decreased at high altitude.

Answer 27

True

Question 28

TRUE OR FALSE: It takes 0.5 sec transmit time before capillary blood gets fully oxygenated in the lungs

Answer 28

False

Question 29

TRUE OR FALSE: If VA/Q=0, alveolar PO2 drops to 40 mmHg

Answer 29

True

Question 30

TRUE OR FALSE: Arterial PO2 is lower than alveolar PO2

Answer 30

True