Cardiovascular system 2

Cardiovascular system 2

Easy and simple questions in human physiology of cardiovascular system

published on August 282 responses 0 5.0★ / 5

1.The Second heart sound is due to..

A. Closure of the AV valves
B. Clousure of semilunar valves
C. Closure of all valves
D. Opening of AV valves
E. Venticular contraction

2.Baroreceptores of carotid sinus and aortic arch are sensitive to

A. Increase in systolic pressure
B. Increase in venous pressure
C. Increase in pulse pressure
D. Increase in venticular pressure
E. All are correct

3.Hypercalcemia (increase Ca2 in the ECF) CAN stop the heart in systole due to

A. The heart rate markedly increased by
calcium ions
B. A calcium ion is essential for relaxation
of the cardiac muscle
C. The cardiac muscle depend on the
intracellular Ca2 for contraction
D. The stroke volume is markedly increased
by calcium ions
E. Increased Ca influx prolong the plateau

4.The rapid mechanism for controlling arterial blood pressure

A. Is hormonaly mediated
B. Act in minute
C. Is mediated mainly via the
D. Stimulates vasoconstrictor hormones
E. All are correct

5.Impulse makes the heart to beat orginates in the

A. SA node
B. Purkinje system
C. Left bundle branch
D. Ventricle
E. AV node

6.Regarding the pace maker potential..

A. Resting potential is -70m V
B. The prepotential caused by decreased K+
C. Depolrization is due to sodium influx
D. Plateau phase caused by T-type calcium
E. It is not a real potential

7.The slowest conduction velocity is in the..

A. SA node
B. Internodal pathway
C. Bundle of his
D. Purkinje system
E. AV node

8.When the radius of a blood vessel is doubled the resistance will

A. Not change
B. Increase 16 times
C. Increase 4 times
D. Decrease 16 times
E. Decrease 4 times

9.It is impossible to tetanize a heart because

A. There is a long refractory period
B. The refractory period and the mechanical
contracitle response are almost equivalent
C. The heart muscles do not contain Ca++
D. The mechanical contracitle event is
usually sborter than the duration of the
electrical Depolrization
E. None is true

10.Y wave in jugular venous pulse occurs in

A. Isometric contraction phase
B. Early filling of right ventricle
C. Atrial systole
D. Venous filling of RA
E. Atrial relaxation

11.Increasing vagal stimulation of the heart will cause an increase in..

A. Heart rate
B. PR interval
C. Venticular contracility
D. Ejection fraction
E. Cardiac output

12.The P wave of the ECG occurs..

A. Before atrial contraction
B. The end of atrial contraction
C. The beginning of venticular contraction
D. The end of venticular contraction
E. None of the above

13.Propagation of the action potential through the heart is fastest in the..

A. SA node
B. Atrial muscle
C. AV node
D. Purkinje fibers
E. Venticular muscle

14.The strength of contraction of left ventricular muscle increases when..

A. End diastolic venticular filling pressure
B. Serum potassium level rises
C. Blood calcium level fall
D. Strenuous exercise is undertaken
E. Peripheral resistance is increased

15.AV valves are opened in

A. Isometric contraction phase
B. Atrial systole phase
C. Pro diastolic phase
D. Maximum ejection phase
E. Never open in the cardiac cycle

16.Which of the following is not a feature of mitral stenosis..

A. Loud firist heart sound
B. Pulmonary hypertension
C. Right venticular hypertrophy
D. Third heart sound
E. Opening snap

17.The aortic valve closed when..

A. the pressure in the left ventricle rises
above the pressure in the aorta
B. Venticular systole begins
C. ventricular systole ends
D. When the pressure in the left ventricle
Both A and B
Both C and D
All are correct

18.The most affected valve in RHF

Aortic valve
Tricuspid valve
Mitiral valve
Pulmonary valve
All of the above

This is the correct sequence of structures that allows the normal sequence of excitation to progress through the heart.

Bundle of His - Purkinje fibres - AV node
SA node - Purkinje fibres - AV node - Bundle
of His
Purkinje fibres - AV node - SA node - Bundle
of His
SA node - AV node - Bundle of His - Purkinje
Bundle of His - SA node - AV node - Purkinje

Which of the below factors would increase stroke volume?

Increased preload, increased afterload,
increased contractility
Decreased preload, decreased afterload,
decreased contractility
Increased preload, decreased afterload,
increased contractility
Decreased preload, increased afterload,
increased contractility
Increased preload, increased afterload,
decreased contractility

This is a network of specialised cardiac muscle fibres that provide a path for each cycle of cardiac excitation to progress through the heart.

Sinoatrial node
Purkinje fibres
Conducting system
Bundle of His

This electrical event triggers contraction of the atria.

R wave
T wave
S wave
P wave
Q wave

Which of these periods represents greatest cardiac output?

Atrial diastole
Ventricular diastole
Atrial systole
Ventricular systole
Septal systole

This electrical event represents repolarization of the ventricle.

R wave
T wave
S wave
P wave
Q wave

Through which structure does blood pass from the right atrium to the right ventricle?

Bicuspid valve
Interventricular septum
Tricuspid valve
Mitral valve
Ascending aorta

In this disorder the aortic valve is narrowed.

Aortic insufficiency
Rheumatic fever
Mitral valve prolapse
Aortic stenosis
Aortic regurgitation

This is the volume of blood ejected from the left ventricle into the aorta each minute.

Cardiac output
Cardiac input
Stroke volume
Heart rate

The second heart sound represents which of the below events?

Valvular stenosis
Semilunar valves opening
Atrioventricular valves closing
Semilunar valves closing
Atrioventricular valves opening