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Dr S Programme Physiology MCQ [File MCQPHYS3]
Respiration/alimentary tract/kidney
Type A
1.
rest:
a)
b)
c)
d)
e)
Select which of the following would NOT be expected in a 70 kg male at
2.
a)
b)
c)
d)
e)
At 37 degrees under which conditions of pH of the blood is constant:
HCO3 to H2CO3 ratio remains constant
the bicarbonate concentration always falls when CO2 is added
as oxygen is given up an equal quantity of carbon dioxide must be taken up
the carbonic acid concentration must be constant
the carbon dioxide content cannot be reduced without producing hypoxia
inspiratory reserve volume of 3500 ml
expiratory reserve volume of 1000 ml
tidal volume of 500 ml
residual volume of 2500 ml
physiological dead space of 150 ml
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 osmoles
b)
increased because of the increased intracellular osmotic pressure
c)
unchanged because of the Donnan equilibrium
d)
decreased because chloride ions diffuse out of erythrocytes
e)
increased because bicarbonate ions are formed within the erythrocytes
4.
Identify the inconsistent value
a)
total arterial blood gas pressure = 755mmHg
b)
total alveolar gas pressure during quiet expiration at sea level +763 mmHg
c)
total alveolar gas pressure at the end of inspiration at all altitudes is given by
(total pressure of gases-water vapour) +47 mmHg
d)
total venous blood gas pressure at sea level is 755mmHg
e)
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 decreased
b)
ventilation is increased because the PCO2 is decreased
c)
his oxygen utilisation coefficient will fall due to reduced atmospheric PO2
d)
expiratory reserve volume is increased because of the lowered atmospheric
pressure
e)
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)
c)
d)
e)
he has an alveolar ventilation of 15L/minute
he is hypoventilating
he has a tidal volume of 1050 ml
he has a minute volume of 24 litres
7.
In the respiratory tract:
a)
the major resistance to airflow is provided by the bronchi
b)
bronchial resistance is increased by an increased alveolar PCO2
c)
bronchial resistance is decreased by beta blockers
d)
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.
a)
b)
c)
d)
e)
Identify the inconsistent value at sea level
alveolar PCO2 =40mmHg
alveolar PO2 = 100mmHg
alveolar PH2O = 47 mmHg
alveolar PN2 = 573 mmHg
PO2 of inspired air =130 mmHg
9.
a)
b)
c)
d)
e)
Identify the inconsistent value on average
arterial P02 = 95 mmHg
arterial blood oxygen content is 210 ml/L
PO2 of mixed venous blood is 40 mmHg
oxygen content of mixed venous blood is 140 ml/L
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 mmHg
b)
PCO2 = 48 mmHg
c)
PN2 = 620 mmHg
e)
oxygen content = 156 ml/L blood
e)
CO2 content = =540 ml / l blood
11.
After inspiration commences, the:
a)
intrapleural pressure and the intrapulmonary pressure both fall
b)
intrapleural pressure falls and the intrapulmonary pressure rises
c)
intrapleural pressure falls and the venous return to the heart decreases
d)
intrapulmonary pressure falls and the volume of the alveoli is momentarily
unchanged
e)
intrapleural pressure rises and the venous return to the heart decreases
12.
a)
b)
c)
d)
e)
Which of the following results in an increase of pH of the duodenal contents?
gastrin
secretin
bombesin
intrinsic factor
motilin
13
a)
b)
c)
d)
e)
A 24 hour urinary ammonia excretion of 75 mmol:
could be associated with chronic diarrhoea
would be favoured in potassium overload
is within the normal range
could be associated with prolonged vomiting
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 same
b) by the end of the descending limb of the loop of Henle, chloride concentration has
increased markedly
c)
by the end of the proximal
16.
a)
b)
c)
d)
e)
A shift of the oxygen dissociation curve fior blood to the LEFT
is favoured by a rise in temperature
favours the passage of oxygen from blood to the tissues
occurs when fetal blood is replaced by adult blood
occurs in the pulmonary arteries
occurs with a fall in pH
17.
a)
b)
c)
d)
e)
Which of the following is true
compliance is directly proportional to the change in pressure
compliance is directly proportional th the work of breathing
complaince is directly proportional to the change in volume
complinace decrease with lung oedema
compliance increases with lung oedema
18.
a)
b)
c)
d)
e)
in the large intestine
the major proportion of intestinal water is absorbed
a substantial proportion of the daily requirement of vitamin A is
synthesized by bacteria
aldosterone stimulates potasssium absorption
segmentation is a common pattern of motility
aldosterone influences bowel motility
19.
a)
b)
c)
d)
e)
The cells of the liver can:
convert all amino acids into glucose
convert acetyl Co-A into pyruvic acid
store vitamin C
unable to store glycogen
store folic acid
20.
An alkaline urine
a) occurs in respiratory alkalosis
b)
cannot have a pH greater than the pH of the plasma from which
the urine is formed
c)
d)
e)
occurs in uncomplicated metabolic acidosis
does not contain ammonia
does not increase the urinary excretion of salicylate
Answers
1D
2A
3A
4D
5A
6B
7D
8E
9E
12B
13A
14E
15D
16D
17D
18D
19E
20A
10C
11A