Ventricular contraction in command of `:-`

Ventricular contraction is in command of :-

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

The strength of ventricular contraction increases when SAN is stimulated by

The strength of ventricular contraction increases when SAN is stimulated by

Refer to the given figure in which A refers to pulmonary artery pressure and B refers to right ventricular pressure. Identify P,Q,R and S in the figure and match with the list (i-iv) given below (i) Isovolumetric ventricular contraction (ii) Ventricular ejection (iii) Isovolumetric ventricular relaxation (iv) Ventricular filling

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

Assertion : Neutral signals through sympathetic nerves can increase the strength of ventricular contraction Reason : Parasympathetic neutral signals synergistically act with sympathetic neutral signal to increase the cardiac output.

Assertion : Neural signals through sympathetic nerves can increase the strength of ventricular contraction Reason : Parasympathetic neural signals synergistically act with sympathetic neutral signal to increase the cardiac output.