Top 550+ Solved Physiology MCQ Questions Answer

a. the diffusion constant

b. tissue area

c. solubility of the gas

d. square root of the molecular weight

e. the difference in partial pressure

a. oxygen consumption is about 6L/min in a moderately fit subject

b. the respiratory exchange ratio rises to 0.8

c. diffusing capacity increases 3-fold

d. the change in cardiac output is only about a sixth of the increase in ventilation

e. the oxygen dissociation curve moves to the left

a. are located in the medulla near exit of cranial nerve X, XI

b. respond directly to changes in external PCO2

c. respond directly to changes in arterial PO2

d. are located on dorsal surface of medulla

e. respond to pH of CSF

a. carotid bodies respond to PO2, PCO2, and pH

b. peripheral chemoreceptor response to arterial PCO2 is more important than central chemoreceptor response

c. aortic bodies are located within the aortic valve ring

d. drop in PO2 < 100mmHg causes increase in firing rate

e. carotid bodies respond to venous PO2

a. sleep

b. barbiturate overdose

c. increasing age

d. decreasing the work of breathing

e. trained athletes and divers

a. three times the area of skin

b. ten times the area of skin

c. 30 times the area of skin

d. 100 times the area of skin

e. none of the above

a. trachea

b. main bronchi

c. large bronchi

d. medium sized bronchi

e. bronchioles

a. 50mL

b. 100mL

c. 150mL

d. 200ml

e. 300ml

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