Top 250+ Solved Respiration MCQ Questions Answer

a. tidal volume is the normal breathing volume

b. vital capacity is the volume from maximal inspiration followed by maximal expiration

c. residual volume is the volume remaining in lungs after maximal expiration

d. functional residual capacity is the volume after normal inspiration

e. total lung capacity is the vital capacity plus residual volume

a. tissue thickness

b. square root of the molecular weight

c. difference in partial pressures

d. tissue area

e. gas solubility

a. 2

b. 5

c. 8

d. 15

e. 25

a. increased arterial pressure leads to increased pulmonary vascular resistance

b. localised vasoconstriction is directly due to arterial PO2 hypoxia

c. regional differences are due to hydrostatic pressure differences

d. at the apex Pa>Pv>PA

e. pulmonary arteries and veins have transmural pressures equal to alveolar pressure

a. serotonin

b. bradykinin

c. leukotrienes

d. prostaglandin E2

e. vasopressin

a. the respiratory quotient nears 1.0 with exercise

b. PIO2= barometric pressure – water vapour pressure

c. PACO2 > PaCO2

d. PAO2 is normally 150mmHg

e. remains valid if there is CO2 present in the inspired gas

a. 0.003ml O2/100ml

b. 0.3ml O2/100ml

c. 3ml O2/100ml

d. 3ml O2/mL

e. 0.3ml O2/L

a. increased PCO2 has a direct effect on the curve, shifting it to the right

b. 2,3-DPG levels rise as altitude

c. the deoxy form of Hb is in the relaxed state

d. CO moves the curve to the left as it has 100 times the affinity of O2 for Hb

e. P50 is at a PO2 of 40mmHg

a. Fick’s law states that “the volume of gas per unit time that moves across a sheet of tissue is proportional to the area of the sheet, but inversely proportional to its thickness”

b. the Bohr effect is “the effect of PCO2 on the O2 dissociation curve due to the action of PCO2 on H+ concentration”

c. Henry’s law states that “the amount of gas dissolved is proportional to the partial pressure of that gas”

d. the chloride shift is “the diffusion of HCO3 - in to the cell, with the outward diffusion of Cl- ions to maintain electrical neutrality”

e. the Haldane effect is that deoxygenation of the blood increases its ability to carry CO2

a. metabolic acidosis

b. metabolic acidosis with renal compensation

c. respiratory acidosis

d. respiratory acidosis with renal compensation

e. respiratory alkalosis

a. the lung volume at any given pressure during inflation is larger than during deflation

b. the area under the pressure-volume curve is known as the compliance

c. surface tension is the force acting across an imaginary line in the surface of the liquid

d. pressure generated in an alveolus equals 4T/R

e. surfactant, produced by Type I alveolar cells, reduces surface tension in alveoli

a. 2-fold

b. 4-fold

c. 8-fold

d. 16-fold

e. has no effect on resistance

a. segmental bronchii

b. medium-sized bronchii

c. small bronchii

d. large bronchioles

e. terminal bronchioles

a. asthma

b. alveolar oedema

c. pulmonary hypertension

d. atelectasis

e. pulmonary fibrosis

a. sleep

b. increasing age

c. trained athlete

d. morphine

e. decreased PO2