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MCQ
Cardiovascular Physiology
Dr S program
November 1996/Update and modified form multiple sources
[File MCQPHYW5]
1. Closure of the aortic valve occurs at the onset of which phase of the cardiac cycle?
a
isovolumetric contraction
b
rapid ejection
c
protodiastole
d
isovolumetric relaxation
e
rapid filling
2, At which point on the pressure volume curve below is the afterload on the heart the greatest?
a.
b
c
d
e
a
b
c
d
e
3. Ventricular muscle receives impulses directly from the
a
Purkinje system
b
bundle of his
c
right and left bundle branches
d
AV node
e
SA node
4. A decrease in stroke work is most likely to be caused by increasing the
a
contractility
b
ejection fraction
c
preload
d
aortic compliance
e
central venous pressure
5. Splitting of the second heart sound into two components is enhanced by
a
delayed closure of the aortic valve
b
delayed closure of the mitral valve
c
early closure of the pulmonic valve
d
prolongation of atrial systole
e
none of the above
6 Which of the following statements about the third heart sound is correct
a
usually diminished in CCF
b
is produced by turbulence during the rapid ventricular filling in early diastole
c
often associated with mitral valve prolapse
d
is produced by turbulence following atrial contraction
e
produced by flow through the foramen ovale
7 Which of the following is incorrectly paired
a
b
c
d
e
dicrotic notch=closure of the aortic valve
preload=end-diastolic volume
propranolol =decrease in myocardial contractility
muscle pump=skeletal muscle movements
Cushing response=tachycardia*
8
a
b
c
d
e
During the isovolumetric period of the cardiac cycle
T wave corresponds
retrograde flow occurs in the proximal aorta
first heart sound
aortic valve is closed and mitral valve is open
none of the above
9 With respect to cardiac conduction. Fastest rate of conduction is
a
atrial muscle
b
SA node
c
purkinje fibres
d
AV node
e
ventricular muscle
10 Pulse pressure is lowest in
a
capillaries in feet in standing position
b
radial artery
c
arteries of the feet
d
aorta
e
femoral artery
11 During inspiration the following changes occur: (pick the correct)
a
decreased right ventricular filling
b
decreased right ventricular output
c
a decrease in systemic arterial pressure
d
a decrease in the pressure gradient from the extra-thoracic veins to the right atrium
e
increase in intra-thoracic pressure
12 Venous pressure in the dural sinuses usually fall in the following range
a
0-5mmhg
b
5-10mmhg
c
10-20mmhg
d
more than 20 mmHg
e
subatmospheric
13 Which organ has the LEAST change in blood flow during exercise
a
skin
b
brain
c
Intestine
d
Heart
e
adrenal medulla
14 The oxygen saturation of blood entering the right ventricle(in a normal adult) is
a
97%
b
85%
c
75%
d
90%
e
37%
15 Which of the following factors influence whether blood flow through a vessel is laminar or
turbulent(pick the incorrect factor)
a
velocity
b
viscosity
c
diameter of vessel
d
e
density
Seville ratio
16 With respect to CEREBRAL BLOOD FLOW which of the following is incorrect
a
decreased by rise in pH
b
usually approximates 750ml/min in the adult
c
reduced by sustained increase in intracranial pressure
d
distribution to different region is not influenced by neuronal activity
e
increased by hypoxaemia
17 Which of the following is true regarding the jugular venous pulse
A
B
C
D
E
At point A
a
atrial systole
b
bulging of the tricuspid leaflets
c
corresponds to isovolumetric ventricular contraction
d
only occurs during tricuspid incompetence
e
rise in venous pressure before the tricuspid valve opens
18
a
b
c
d
e
At point B
bulging of the tricuspid leaflets into the atrium during Right ventricular contraction
atrial systole
dicrotic notch
artefact seen in atrial flutter
rise in venous pressure before the tricuspid valve opens
19
Which statements are incorrectly paired
a
In the above diagram the A-B interval approximates the PQ interval of the ECG
b
venoconstriction= increased venous return
c
left atrial pressure 30mmHg= normal pulmonary artery pressure
d
increased myocardial contractility=increased myocardial O2 consumption
e
increase in End diastolic volume=increased stroke volume
20 The dicrotic notch is caused by
a
closure of the A-V valves
b
opening of the aortic valve
c
closure of the aortic valve
d
closure of the mitral and then opening of the aortic valve
e
none of the above
Answers to MCQPHYWK5
1d
11c
2c
12e
3a
13b
4d
14c
5e
15e
6b
16d
7e
17a
8b
18a
9e (C!) 10a
19c
20c