The Pulse

Q.

What would be the cardiac output of a person having 72 heart beats per minute and a stroke volume of 50 ml?

1. 7200 ml

2. 5000 ml

3. 3600 ml

4. 360 ml

Q.

P-wave of ECG indicates:

(1) Depolarisation of atrial muscles

(2) Activation of the SA node

(3) Spread of excitation from the SA node to the V node

(4) Repolarisation of atria and depolarisation of ventricle

1. 1 and 3 are correct.

2. 2 and 4 are correct.

3. 1 and 2 are correct.

4. 1, 2 and 3 are correct.

Q. Which of the following instruments is used by a doctor to hear the sounds of the heartbeat?

1. Spirometer
2. Thermometer
3. Stethoscope
4. Sphygmomanometer

Q.

Stroke volume is the amount of blood the left ventricle pumps out in one cardiac cycle. This is around 70ml. Now, to get the cardiac output, we have to multiply (i)__ with the normal heart rate of (ii)__ and we get (iii)__ ml. This means that in one minute, a normal heart pumps about (iv)__ litres of blood out.

1. (i) Stroke volume, (ii) 72, (iii) 5, 040, (iv) 5

2. (i) Total volume, (ii) 82, (iii)8, 200, (iv) 8

3. (i) Volume of the heart, (ii) 72, (iii)3, 720, (iv) 3

4. (i) Volume of the ventricles, (ii) 72, (iii)2, 600, (iv) 2

Q. Heart produces two distinct sounds one after the other. The second sound is produced when

1. vibration of ventricular walls to blood gushing in from atria
2. semilunar valves close down after the blood flows into the vessels from ventricles
3. reception of signal by AV node from SA node
4. opening up of AV valves

Q. First heart sound is produced due to

1. closure of the tricuspid
2. closure of the bicuspid
3. closure of the semilunar valves
4. both a and b

Q.

Which of the component of an ECG is correctly matched below ?

1. Peak P - initiation of left atrial contraction only.

2. Peak T - initiation of total cardiac contraction

3. Peak P and R together - systolic and diastolic blood pressures

4. QRS - one complete pulse

Q.

ECG depicts the depolarisation and repolarisation processes during the cardiac cycle. In the ECG of a normal healthy individual one of the following waves is not represented.

1. Depolarisation of atria

2. Repolarisation of atria

3. Depolarisation of ventricles

4. Repolarisation of ventricles

Q.

A normal ECG has the readings as ;

1. 1.Depolarization, 2. Q, 3. R, 4.Depolarization, 5. Repolarization

2. 1. Repolarization, 2.Q, 3. R, 4. Depolarization, 5. Depolarization

3. 1. Repolarization, 2. Q, 3.R, 4. Repolarization, 5.Depolarization

4. 1.Depolarization, 2. R, 3.Q, 4. Repolarization, 5. Repolarization

Q. If stroke volume of human heart is considered 80ml and to pump 5L of blood, how many beats are required?

Q.

The first sound______is produced when the auriculo-ventricular valves get closed at the start of ventricular systole.

Q. Which one of the following is a correct matching pair?

1. Lub - sharp closure of AV valves at the beginning of ventricular systole
2. Dub - sudden opening of semilunar valves at the beginning of ventricular diastole
3. Pulsation of the radial artery - valves in the blood vessels
4. Initiation of the heart beat - Purkinje fibres

Q. Given below is the ECG of a normal human. Which one of its components is correctly interpreted below?

1. Complex QRS - one complete pulse
2. Peak T - Initiation of total cardiac contraction
3. Peak P and peak R together - Systolic and diastolic blood pressures
4. Peak P - initiation of left atrial contraction only

Q.

The 3 variables which measure the efficiency of cardiac cycle and the heart’s pumping activity are _______.

1. Blood pressure, pulse, cardiac output.

2. Systole, diastole, stroke volume.

3. Isovolumetric contraction, isovolumetric relaxation, ejection.

4. Sinoatrial node, bundle of His, atrioventricular node.