Bundle of His includes:

(1) Purkinje fibres + left AV bundle

(2) Purkinje fibres + right AV bundle

(3) Purkinje fibres + right and left AV bundle

(4) SA node + AV node + AV bundle

Which one of the following is wrong with respect to nodal tissue.

(1) auto excitable

(2) not localized to a single chamber.

(3) equal ability to excite throughout nodal tissue.

(4) structural changes are observed throughout nodal musculature in different chambers of the heart.

The duration of cardiac cycle is–

(1) 0.8 second

(2) 0.5 second

(3) 0.3 second

(4) 0.4 second

The number of action potential generated by SAN:

(1) 70–75 times per minute.

(2) 50–72 times per minute.

(3) Exact 70 times per minute.

(4) not more than 60 times per minute.

The route of action potential in heart is

(1) SA node – AV node – AV bundle

(2) AV node – SA node – bundle of his – AV bundle

(3) SA node – AV node – AV bundle – Bundle of His

(4) SA node – AV node – Purkinje fibres

If the stroke volume of Human heart is considered 80 mL and to pump 5L of blood how many beats are required?

(1) 63

(2) 70

(3) 72

(4) 60

The lub sound of heart is produced during which phase of cardiac cycle?

(1) ventricular systole

(2) atrial diastole

(3) joint diastole

(4) atrial systole

The sequence of opening (O) and closing (C) of heart –valves are:

(1) AV valves open before the closure of SL or semilunar valves.

(2) AV valves close before the closure of SL or semilunar valves.

(3) AV valves open after the closure of SL or semilunar valves.

(4) AV valves close with closure of SL or semilunar valves.

The machine taking the reading of electrical activity of heart is known as

(1) Electrocardiogram

(2) Electrocardiograph

(3) MRI

(4) Biopsy

The results of ECG are known as

(1) Electrocardiogram

(2) Electrocardiograph

(3) MRI

(4) Biopsy