Sinuatrial node cells are

A. False   The SA node is in the right atrium near its junction with the superior vena cava.

B. True   Vagal activity slows the rate of impulse generation and thus the heart rate.

C. False   The SA node has intrinsic rhythmicity and can generate impulses independently.

D. False   Purkinje tissue is confined to the ventricles; atrial fibres conduct impulses from the SA to the AV node.

E. True   Impulse generation is due to spontaneous diastolic depolarization of the cells.