The A. V node normally initiates the cardiac impulses.

Indicate whether the following statements are true of false : (a) Both auricles of amphibian heart open into the same ventricle. (b) Prawn's heart carries only oxygenated blood. (c ) Purkinje fibres are nerve fibres supplying the ventricular muscles. (d) The first heart sound results from a closure of semilunar valves. (e ) The vagus nerve reduces the heart rate. (f) The A-V node normally initiates the cardiac impulse. (g) Semilunar valves open during the ventricular diastole.

In cardiac muscle

Which of the following statement(s) is/are correct? I. Bundle of His originates from the SA-node. SA-node is situated in the wall of right auricle. III. Auricular contraction stimulates the AV-node. IV. AV-node sets up the cardiac impulses 72 times per minute. Choose the correct answer.

Where does cardiac impulses orginate?

Cardiac cycle.

Assertion : The AV bundle is essential for the conduction of cardiac impulse. Reason: There is no continuity between the cardiac muscle fibers of the auricles and those of the ventricles.

Cardiac output.

Cardiac output is

Cardiac muscle are :-

Since it is the sino-auricular node, which initiates the impulses in the heart of mammal is called