Which of the following is mismatched? 
1. Lub : First heart sound associated with closure of tricuspid and bicuspid valves
2. Cardiac output : Stroke volume multiplied by heart rate
3. Dub : Second heart sound, due to opening of semilunar valves
4. Duration of cardiac cycle : 0.8 seconds 
Subtopic:  Rhythmic Excitation of Human Heart: Part 1 | Rhythmic Excitation of Human Heart: Part 2 |
 86%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.

Impulse initiation in the normal human heart occurs at the:
1. Atrioventricular node
2. Purkinje fibre network
3. Sinoatrial node
4. Bundle of His
Subtopic:  Rhythmic Excitation of Human Heart: Part 1 | Rhythmic Excitation of Human Heart: Part 2 | Regulation of Cardiac Activity | Circulatory Pathways |
 89%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.