Top 250+ Solved Respiration MCQ Questions Answer

a. 50%

b. 60%

c. 70%

d. 80%

e. 90%

a. the difference between alveolar pressure and the pressure within them

b. the pressure in the pulmonary artery

c. the lung volume

d. the cardiac output

e. the patient’s fluid status

a. males eliminate carboxy haemoglobin faster than females

b. gas around the body is normal air compressed to the same high pressure

c. it produces marked increases in dissolved oxygen in the blood

d. oxygen is administered at up to 3 atmospheres pressure

e. toxicity includes optic neuritis

a. shift to the right of the oxygen dissociation curve

b. increased number of capillaries in peripheral tissues

c. pulmonary vasodilation

d. polycythaemia

e. increased maximum breathing capacity

a. pulmonary stretch receptors lie within the airway epithelial cells

b. J receptors, when stimulated, cause slow deep breathing

c. irritant receptors, when stimulated, send impulses up the vagus in unmyelinated fibres

d. irritant receptors are rapidly adapting

e. increased maximum breathing capacity

a. tidal volume in the average human is 500ml

b. anatomical dead space is the volume of the conducting airway and is about 160ml

c. upper regions of the lung ventilate better than the lower regions

d. you can measure physiological dead space via Bohr’s method to get what is called a Bohr equation which is: VD PACO2-PECO2 VT PACO2

e. None of the above

a. P1-P2

b. area of lung

c. the thickness

d. diffusion constant

e. all of the above

a. hyperventilation occurs due to hypoxic stimulation of peripheral chemoreceptors

b. pro-erythroblasts mature into erythrocytes more rapidly than normal

c. renal bicarbonate excretion increases

d. increased numbers of mitochondria appear in the tissues

e. FiO2 decreases with increasing altitude

a. conversion of AI to AII by ACE

b. metabolism of AII

c. inactivation of bradykinin

d. removal of serotonin

e. metabolism of arachidonic acid metabolises

a. O2 toxicity causes convulsion

b. O2 at 100% in premature infants causes retrolental fibroplasia

c. acclimatisation to high altitudes include a shift to the left of the O2 dissociation curve

d. polycythaemia is a feature of acclimatisation

e. acute mountain sickness is due to hypoxaemia and alkalosis

a. medullary centres are close to but separate from central chemoreceptors

b. during quiet respiration, expiration is a passive event

c. inspiratory medullary neurons supply both phrenic nerves

d. ventral medullary neurons are expiratory and do not discharge spontaneously

e. inspiratory medullary neurons discharge spontaneously at a rate of 12-15 times/minute

a. O2

b. N2O

c. CO2

d. CO

e. halothane

a. it is calculated by Bohr’s method

b. the normal value is about 150ml

c. it increases with large inspirations

d. depends on the size of the subject

e. it is equivalent to the conducting zone

a. 2

b. 4

c. 6

d. 1

a. 1

b. 2

c. 4

d. 6