1. | Increased ventricular pressure causes closing of the semilunar valves. |
2. | The atrio-ventricular node (AVN) generates an action potential to stimulate atrial contraction. |
3. | The tricuspid and the bicuspid valves open due to the pressure exerted by the simultaneous contraction of the atria. |
4. | Blood moves freely from atrium to the ventricle during joint diastole. |
Inadequate supply of oxygen to heart muscles leads to a symptom of acute chest pain. This disorder of the circulatory system is identified as:
1. Angina pectoris
2. Cardiac arrest
3. Heart failure
4. Coronary Heart Disease
List I | List II |
A. P-wave | I. Ventricular repolarization-relaxation phase |
B. P-R interval | II. The onset of ventricular depolarization - leads to ventricular contraction |
C. QRS complex | III. Time for the impulse to be conducted from SA node to the ventricles through the AV node |
D. T-wave | IV. Atrial depolarization - leads to atrial contraction |