What is the time needed for the ventricular contraction?

What is the time needed for atrial contraction?

Presence of which of the following hormones can increase the strength of ventricular contraction, a. Epinephrine, b. Acetylcholine, c. Nor adrenaline, d. Catecholamines

Which of the folllowing structures prevents atrioventricular valves from reverting into atria during ventricular contraction?

Which of the folllowing structures prevents atrioventricular valves from reverting into atria during ventricular contraction?

The "lubb" sound (first heart sound) is caused by 1. filling of the ventricles 2. ventricular contraction 3. closing of the AV valves 4. closing of semilunar valves

What is the significance of atrioventricular node and atro ventricular bundle in the functioning of heart?

What is the significance of atrio-ventricular node and atrio-ventricular bundle in the functioning of heart?