Match List I with List II. [2024]
| List I | List II | ||
| A. | P wave | (I) | Heart muscles are electrically silent |
| B. | QRS complex | (II) | Depolarisation of ventricles |
| C. | T wave | (III) | Depolarisation of atria |
| D. | T-P gap | (IV) | Repolarisation of ventricles |
Choose the correct answer from the options given below:
A-I, B-III, C-IV, D-II
A-III, B-II, C-IV, D-I
A-II, B-III, C-I, D-IV
A-IV, B-II, C-I, D-III
(2)
The P-wave represents the electrical excitation (or depolarisation) of the atria which leads to the contraction of both the atria. The QRS complex represents the depolarisation of the ventricles which initiates the contraction of ventricles. The contraction starts shortly after Q and marks the beginning of the systole. The T-wave represents the return of the ventricles from excited to normal state (repolarisation). The T-P gap represents the time when the heart muscles are electrically silent.
Match List I with List II. [2023]
| List I (ECG) | List II (Electrical activity of heart) | ||
| (A) | P-wave | (I) | Depolarisation of ventricles |
| (B) | QRS complex | (II) | End of systole |
| (C) | T wave | (III) | Depolarisation of atria |
| (D) | End of T wave | (IV) | Repolarisation of ventricles |
Choose the correct answer from the options given below:
(A)-(IV), (B)-(I), (C)-(III), (D)-(II)
(A)-(I), (B)-(IV), (C)-(III), (D)-(II)
(A)-(IV), (B)-(III), (C)-(I), (D)-(II)
(A)-(III), (B)-(I), (C)-(IV), (D)-(II)
Match List I with List II.
| List I | List II | ||
| A. | P-wave | I. | Beginning of systole |
| B. | Q-wave | II. | Repolarisation of ventricles |
| C. | QRS complex | III. | Depolarisation of atria |
| D. | T-wave | IV. | Depolarisation of ventricles |
Choose the correct answer from the options given below:
A-II, B-IV, C-I, D-III
A-I, B-II, C-III, D-IV
A-III, B-I, C-IV, D-II
A-IV, B-III, C-II, D-I
(3)
The P-wave represents the electrical excitation (or depolarisation) of the atria which leads to the contraction of both the atria. The QRS complex represents the depolarisation of the ventricles which initiates the contraction of ventricles. The contraction starts shortly after Q and marks the beginning of the systole. The T-wave represents the return of the ventricles from excited to normal state (repolarisation). The end of the T-wave marks the end of systole.
Which one of the following statements is correct? [2022]
The atrio-ventricular node (AVN) generates an action potential to stimulate atrial contraction.
The tricuspid and the bicuspid valves open due to the pressure exerted by the simultaneous contraction of the atria.
Blood moves freely from atrium to the ventricle during joint diastole.
Increased ventricular pressure causes closing of the semilunar valves.
The QRS complex in a standard ECG represents [2020]
repolarisation of auricles
depolarisation of auricles
depolarisation of ventricles
repolarisation of ventricles
(3)
The QRS complex represents the depolarisation of the ventricles, that initiates the ventricular contraction.
Match the column - I with column - II. [2019]
| Column-I | Column-II | ||
| (A) | P-wave | (i) | Depolarisation of ventricles |
| (B) | QRS complex | (ii) | Repolarisation of ventricles |
| (C) | T-wave | (iii) | Coronary ischaemia |
| (D) | Reduction in the size of T-wave | (iv) | Depolarisation of atria |
| (v) | Repolarisation of atria |
Select the correct option.
A-(ii), B-(iii), C-(v), D-(iv)
A-(iv), B-(i), C-(ii), D-(iii)
A-(iv), B-(i), C-(ii), D-(v)
A-(ii), B-(i), C-(v), D-(iii)
(2)
A normal electrocardiogram or ECG comprises of a P wave, a QRS wave complex and a T wave in which P wave represents depolarisation of the atria, QRS wave complex represents depolarisation of the ventricles and T wave represents ventricular repolarisation. Myocardial ischaemia can affect morphology of T-wave in a variety of ways, i.e., T-wave may become tall, flattened, inverted or biphasic. Flattened T-waves is common in patient with myocardial ischaemia.
What would be the heart rate of a person if the cardiac output is 5 L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL? [2019]
125 beats per minute
50 beats per minute
75 beats per minute
100 beats per minute
(4)
Stroke volume = End diastolic volume – End systolic volume
= 100 – 50 = 50 mL
Cardiac output = Heart beat × Stroke volume
Heart beat = Cardiac output / Stroke volume
= 5000 / 50 = 100 beats per minute
Match the items given in column I with those in column II and select the correct option given below. [2018]
| Column I | Column II | ||
| A. | Tricuspid valve | (i) | Between left atrium and left ventricle |
| B. | Bicuspid valve | (ii) | Between right ventricle and pulmonary artery |
| C. | Semilunar valve | (iii) | Between right atrium and right ventricle |
A - (iii), B - (i), C - (ii)
A - (i), B - (iii), C - (ii)
A - (i), B - (ii), C - (iii)
A - (ii), B - (i), C - (iii)
Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when [2015]
AV node receives signal from SA node
AV valves open up
Ventricular walls vibrate due to gushing in of blood from atria
Semilunar valves close down after the blood flows into vessels from ventricles.
(4)
Second heart sound i.e., dup is caused by the closure of the semilunar valves and marks the end of ventricular systole.
Blood pressure in the mammalian aorta is maximum during [2015]
systole of the left ventricle
diastole of the right atrium
systole of the left atrium
diastole of the right ventricle
(1)
The temporary rise in blood pressure during the contraction of the heart is called systolic pressure and the temporary fall in blood pressure during relaxation of the heart is called diastolic pressure. Blood pressure is expressed as the ratio of the systolic pressure over the diastolic pressure. For a healthy resting adult person, the average systolic/diastolic pressures are 120/80 mmHg. Aorta is directly supplied by left ventricle thus, the blood pressure in aorta is highest during systole of left ventricle. During it, left ventricle contracts and pushes blood into aorta.
