Dr S Programme Physiology MCQ [File MCQPHYS3]

Respiration/alimentary tract/kidney

Type A1. Select which of the following would NOT be expected in a 70 kg male at rest:a) inspiratory reserve volume of 3500 mlb) expiratory reserve volume of 1000 mlc) tidal volume of 500 mld) residual volume of 2500 mle) physiological dead space of 150 ml

2. At 37 degrees under which conditions of pH of the blood is constant:a) HCO3 to H2CO3 ratio remains constantb) the bicarbonate concentration always falls when CO2 is addedc) as oxygen is given up an equal quantity of carbon dioxide must be taken upd) the carbonic acid concentration must be constante) the carbon dioxide content cannot be reduced without producing hypoxia

3. When the CO2 diffuses into the blood across the systemic capillaries the size of the erythrocytes is:a) increased because of the increased intracellular osmolesb) increased because of the increased intracellular osmotic pressurec) unchanged because of the Donnan equilibriumd) decreased because chloride ions diffuse out of erythrocytese) increased because bicarbonate ions are formed within the erythrocytes

4. Identify the inconsistent valuea) total arterial blood gas pressure = 755mmHgb) total alveolar gas pressure during quiet expiration at sea level +763 mmHgc) total alveolar gas pressure at the end of inspiration at all altitudes is given by (total pressure of gases-water vapour) +47 mmHgd) total venous blood gas pressure at sea level is 755mmHge) total alveolar gas pressure during a deep inspiration at sea level =755mmHg

5. A normal healthy man undergoes a journey of 30 minutes duration in an unpressurised cabin of an aircraft at 20,000 feet. Atmospheric pressure falls by approximately 100mmHg for each 5000 feet ascent from sea level:a) cyanosis could present because the alveolar PO2 is decreasedb) ventilation is increased because the PCO2 is decreasedc) his oxygen utilisation coefficient will fall due to reduced atmospheric PO2d) expiratory reserve volume is increased because of the lowered atmospheric pressuree) haemoglobin concentration in the blood rises because of the tissue hypoxia

6. A man with a respiratory dead space of 1250 ml inspires 18 litres of air per minute at a rate of 20 breaths per minute and has an oxygen consumption of 300L/min. Which of the following statements is correct?a) he has a vital capacity of 4 litres

b) he has an alveolar ventilation of 15L/minutec) he is hypoventilatingd) he has a tidal volume of 1050 mle) he has a minute volume of 24 litres

7. In the respiratory tract:a) the major resistance to airflow is provided by the bronchib) bronchial resistance is increased by an increased alveolar PCO2c) bronchial resistance is decreased by beta blockersd) the major resistance to airflow is provided by the upper respiratory passages(above the trachea)e) bulk flow of air from the terminal bronchioles to alveoli is increased by adrenaline

8. Identify the inconsistent value at sea levela) alveolar PCO2 =40mmHgb) alveolar PO2 = 100mmHg c) alveolar PH2O = 47 mmHgd) alveolar PN2 = 573 mmHge) PO2 of inspired air =130 mmHg

9. Identify the inconsistent value on averagea) arterial P02 = 95 mmHgb) arterial blood oxygen content is 210 ml/Lc) PO2 of mixed venous blood is 40 mmHgd) oxygen content of mixed venous blood is 140 ml/Le) at a PO2 of 70 mmHg, blood oxygen content is 170ml/L

10 Identify the inconsistent value in these measurements on a mixed venous blood sample obtained in a healthy person from the inferior vena cava at sea level:a) PO2 = 40 mmHgb) PCO2 = 48 mmHgc) PN2 = 620 mmHge) oxygen content = 156 ml/L bloode) CO2 content = =540 ml / l blood

11. After inspiration commences, the:a) intrapleural pressure and the intrapulmonary pressure both fallb) intrapleural pressure falls and the intrapulmonary pressure risesc) intrapleural pressure falls and the venous return to the heart decreasesd) intrapulmonary pressure falls and the volume of the alveoli is momentarily unchangede) intrapleural pressure rises and the venous return to the heart decreases

12. Which of the following results in an increase of pH of the duodenal contents?a) gastrinb) secretinc) bombesind) intrinsic factore) motilin

13 A 24 hour urinary ammonia excretion of 75 mmol:a) could be associated with chronic diarrhoeab) would be favoured in potassium overloadc) is within the normal ranged) could be associated with prolonged vomitinge) would require a urinary volume in excess of 2 litres

14. In comparison with the concentration in arterial plasma, which one of the following is INCORRECT?a) by the end of the proximal tubule the sodium concentration is the sameb) by the end of the descending limb of the loop of Henle, chloride concentration has

increased markedlyc) by the end of the proximal

16. A shift of the oxygen dissociation curve fior blood to the LEFTa) is favoured by a rise in temperatureb) favours the passage of oxygen from blood to the tissuesc) occurs when fetal blood is replaced by adult bloodd) occurs in the pulmonary arteriese) occurs with a fall in pH

17. Which of the following is truea) compliance is directly proportional to the change in pressureb) compliance is directly proportional th the work of breathingc) complaince is directly proportional to the change in volumed) complinace decrease with lung oedemae) compliance increases with lung oedema

18. in the large intestinea) the major proportion of intestinal water is absorbedb) a substantial proportion of the daily requirement of vitamin A is

synthesized by bacteriac) aldosterone stimulates potasssium absorptiond) segmentation is a common pattern of motilitye) aldosterone influences bowel motility

19. The cells of the liver can:a) convert all amino acids into glucoseb) convert acetyl Co-A into pyruvic acidc) store vitamin Cd) unable to store glycogene) store folic acid

20. An alkaline urinea) occurs in respiratory alkalosis

b) cannot have a pH greater than the pH of the plasma from which the urine is formed

c) occurs in uncomplicated metabolic acidosisd) does not contain ammoniae) does not increase the urinary excretion of salicylate

Answers

1D 2A 3A 4D 5A 6B 7D 8E 9E 10C 11A

12B 13A 14E 15D 16D 17D 18D 19E 20A